9487( 4) - 10/16/02 15:02 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9487 Version: 4 Check-in Date: 16-Oct-2002 14:43:03 1.Proposal Title: UV Sounding of the M-Giant Atmosphere in the Symbiotic Binary EG-AND ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 11 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Brian Espey University of Dublin, Trinity College CoI: Dr. Stephan McCandliss The Johns Hopkins University N CoI: Dr. Peter Hauschildt The University of Georgia N CoI: Mr. Travis Barman Jr. The University of Georgia N CoI: Dr. Thomas Dumm Institute of Astronomy, ETH N CoI: Dr. Rolf Walder Institute of Astronomy, ETH N CoI: Prof. Henny Lamers University of Utrecht N CoI: Prof. Francis Keenan Queen's University of Belfast N CoI: Prof. Gary Ferland University of Kentucky N ------------------------------------------------------------------------------------ 5. Abstract EG-AND is an eclipsing system which provides us with the capability to study the structure of a fairly normal non- variable red giant point-by-point through its atmosphere. The white dwarf secondary provides a bright far-UV continuum source against which absorption from a broad range of ionization levels can be seen, ranging from molecular hydrogen close to the giant star to ionized material further away. The systemic velocity is such that these features are well resolved from the intervening ISM component. In addition, the system has low extinction (A_V = 0.15), has never been observed to undergo an eruption, and has a circular orbit, so there is no periodic disturbance of the giant atmosphere. Both calculation and direct observation show that the effect of the dwarf star's ionizing continuum on the red giant is minimal. We have an on-going FUSE program that has covered part of the orbital cycle. We have proposed for FUSE Cycle 3, and we request observing time with STIS to complete the picture. The resolution of the FUSE and STIS spectra are well- matched and suitable for detailed comparison of the intrinsic atmospheric features. Existing archival IUE data is insufficient for our purposes due to low resolution and/or low S/N. HRS data is of low S/N, partial wavelength coverage, and may suffer from instrumental scattered light. Even when both datasets are combined, some phases have never been observed in the UV. ------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 2] Observations Description ------------------------ General: We require medium resolution echelle observations with the E140M and E230M gratings at a number of phases to measure the phase-dependent absorbing column in the red giant star. The resolution and wavelength coverage of these gratings provide complementary coverage for the FUSE spectra (see below). For the declination of the target, a visibility of 54 minutes is attainable (HST Primer Table 6.1). paragraphRequired phase coverage We request ephemeris observations of EG-AND. Although this eclipsing binary has an orbital period of 482 days, close to occultation of the white dwarf it is important to schedule observations within a relatively small window as the absorbing columns due to material near the giant alter rapidly. The requirements of the above sections translate themselves into a series of observations spanning the ingress phases (Cycle 11) of the white dwarf behind the red giant. We also request observations near maximum light to provide a fiducial measurement and to search for weak circumbinary absorption. We request a total of 7 observations (visits). Signal to Noise Estimates: Existing IUE and HUT observations were used, together with the STIS Spectroscopic ETC to estimate fluxes and exposure times. At the edge of eclipse ingress/egress the f(1400) ~ 3 times 10^-13 erg cm^-2 s^-1 Angstrom^-1 and to obtain a S/N ~ 15 per resolution element for E140M Lambda_c = 1425 Angstrom, we require 2 orbits for both the E140M and E230M settings including acquisition overheads and instrument setup times, assuming a visibility of 54 mins (HST Primer Table 6.1 Orbital Visibility). At partial phases we require 3 orbits per visit. The E140M contains the wavelength range where most of our science will be obtained and we need resolution of the CO molecular lines. At minimum phase the continuum is nearly completely extinguished, and here we will use 2 orbits to monitor the emission line profiles for any changes as the emission region near the white dwarf undergoes eclipse and to confirm that the eclipse is, indeed, total in the UV region. We will use continuum binning to improve on the relatively noisy continuum flux estimates determined from IUE spectra (poorly determined below f_Lambda ~ 10^- 14, erg, cm^-2 s^-1 Angstrom^-1). Although EG-AND has relatively narrow emission lines in the UV, we have verified that these are not sufficiently strong to pose a concern in terms of either local or global MAMA countrate limits. The strongest line is CIV 1548, 1550 with f_Lambda = 4.73 * 10^-11, erg, cm^-2 s^-1. We have assumed FWHM = 35, km, s^-1 for these lines based on optical echelle data of the HeII 4686 line. Resolution Our FUSE spectra have a resolution of ~ 20, 000 and will be well-matched to the E140M (R ~ 45, 800). We can sacrifice some resolution in the STIS echelle spectra to improve S/N for more eclipsed phases, but have retained the same exposure time as a guide. We also request E230M 1978/2707 data to obtain information on the strength of the CIII] 1909 and MgII 2798 Angstrom features. Resolution is not as critical for this. The STIS E140M mode is ideally suited to the determination of column densities by profile fitting for this project. We estimate that spectra with a S/N ~ 10 combined with the E140M resolution of R = 45, 000 will be sensitive to equivalent widths ~ 10 mAngstrom for 3-Sigma detections at 1400 Angstrom. Following Morton (1991), this allows detection of spectral absorption features as weak as log(lambda_f)> 0.9 at log(N) = 14, log(lambda_f) > -0.1, at log(N) = 15, log(lambda_f) > -1.1, at log(N) = 16, where N is the column density in cm^- 2. The 1123 - 1700 Angstrom bandpass encompasses the transitions of many important atomic and molecular species existing in cool giant atmospheres including neutral and low ionization states of H, C, N, O, as well as CO and H_2O. One other important atmospheric constituent outside of this bandpass is molecular hydrogen and we our obtaining FUSE data in Cycle 2 (2001), and have requested additional time during FUSE Cycle 3 (2002) to obtain eclipse spectra of the molecular hydrogen component. paragraphCO 4th positive band The dispersion of the E140M is high enough to separate the individual rotational 9487( 4) - 10/16/02 15:02 - [ 3] components with the vibrational 4th positive bands of CO (A ^1Pi--X ^1Sigma^+) and these will be important temperature and pressure diagnostics. The temperatures we expect to encounter in the atmosphere range from ~ 1000 - 3700 K. These temperatures will cause a significate increase in the population of higher vibrational and rotational levels (0 le v" <= 4 and 0 le J" <= 100) in the ground electronic state (X ^1Sigma^+). There are 22 ground state vibrational bands of the 4th positive CO system with bandheads between 1130 and 1543 Angstrom. The wide distribution of the bands over the E140M wavelength range will provide a number of opportunities for column density and temperature determination as the spectrum is progressively reddened and attenuated towards eclipse. We have at our disposal a number of CO databases and fitting programs, originally developed for analyzing CO absorption (including the ^13C^16O isotope) in Beta Pictoris (McPhate 1998, Lagrange et al. 1998) where the temperature of the CO is typically less than 100K. These codes are being modified to include absorptions from the thermally excited lower states. Real Time Justification ----------------------- Our observations will be time critical. For some phases we need our observations to be scheduled within a phase difference of Phi +/- 0.01 (= +/- 5 days) from our requested times to achieve our desired phase coverage close to the time of white dwarf occultation. From IUE data we know that the onset of complete continuum absorption is swift, so the scheduling window is proportionally smaller around these phases. For the observations closer to maximum light, timing is not as critical. We have been monitoring EG-AND with the Far Ultraviolet Spectroscopic Explorer in FUSE Cycles 1 & 2 (calendar years 2000, 2001). We have, in addition, obtained time during FUSE Cycle 3 proposal to obtain further far-UV spectral coverage in 2002. We wish to coordinate coverage of EG-AND using both FUSE and HST to monitor the atomic and molecular absorption (as well as any possible emission line variations) around the time of white dwarf eclipse. IUE observations around the time of eclipse suggest that the absorbing material is asymmetrically distributed (see Figure 1) and so both ingress and egress phases are required. The egress phase has already being monitored with FUSE in the Sept - Dec 2001 timeframe. We plan on scheduling FUSE visits to coincide with HST observations. FUSE will cover the region 900 - 1200 Angstrom at a resolution of R = 20, 000 - 30, 000, so STIS data with R = 45, 800 and 1123 - 1710 Angstrom complement these data well in terms of both resolution and spectral coverage. Ground-based echelle data are also being obtained on an on- going basis. Relative timing of the FUSE and HST observations will be tighter around mid-eclipse when absorption columns (and spectral changes) occur on short (~ days) timescales. Close to the edges of the eclipse phases timing will be less critical. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD4174 STAR, SYMBIOTIC STAR RA=00H 44M 37.18S +/- 0.1S, J2000.0 V = 7.3+/-0.4 DEC=40D 40' 45.6" +/- 0.1" B-V = 1.59 Coordinate Source: HIPPARCOS_INPUT_CATALOGUE Comments: Coordinates from Hipparcos INCA as supplied via GSC search 9487( 4) - 10/16/02 15:02 - [ 5] Visit: 01 Visit Priority: Visit Requirements: BETWEEN 14-Mar-2002 AND 19-Jun-2002 BETWEEN 09-Jul-2003 AND 04-Oct-2003 On Hold Comments: Additional Comments: Phase 0.55 +/- 0.10 observation of eclipsing system Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD4174 STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.1 S CD Comments: From ETC run with sp=M2V, V=7.3, predicts S/N = 80 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD4174 STIS/C ACQ/PEA 0.2X0.0 G430L 4300 1 5.0 S CD K 6 Comments: ETC run with sp=M2V, V=7.3, and 50% slit loss - needs dispersed peakup. ------------------------------------------------------------------------------------------------------------------------------------ 3 HD4174 STIS/N ACCUM 0.2X0.0 E230M 1978 1 1150 S MIN DUR 75% MAX DUR 120% UV-MAM 6 EXPAND A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD4174 STIS/N ACCUM 0.2X0.0 E230M 2707 1 500 S MIN DUR 75% MAX DUR 110% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 6 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 2800 S MIN DUR 50% MAX DUR 200% UV-MAM 6 EXPAND A ------------------------------------------------------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 6] Visit: 02 Visit Priority: Visit Requirements: BETWEEN 18-Aug-2002 AND 11-Sep-2002 On Hold Comments: Additional Comments: Phase 0.800 +/- 0.025 observation of eclipsing system Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD4174 STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.1 S CD Comments: From ETC run with sp=M2V, V=7.3, predicts S/N = 80 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD4174 STIS/C ACQ/PEA 0.2X0.0 G430L 4300 1 5.0 S CD K 6 Comments: From ETC run with sp=M2V, V=7.3, and 50% slit loss. Needs dispersed peakup ------------------------------------------------------------------------------------------------------------------------------------ 3 HD4174 STIS/N ACCUM 0.2X0.0 E230M 1978 1 1150 S MIN DUR 75% EXPAND UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD4174 STIS/N ACCUM 0.2X0.0 E230M 2707 1 500 S MIN DUR 75% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 6 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 2800 S MIN DUR 50% MAX DUR 200% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 7] Visit: 03 Visit Priority: Visit Requirements: BETWEEN 16-Oct-2002 AND 22-Oct-2002 On Hold Comments: Additional Comments: Phase 0.905 +/- 0.005 observation of eclipsing system Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD4174 STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.1 S CD Comments: From ETC run with sp=M2V, V=7.3, predicts S/N = 80 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD4174 STIS/C ACQ/PEA 0.2X0.0 G430L 4300 1 5.0 S CD K 6 Comments: From ETC run with sp=M2V, V=7.3, and 50% slit loss. Needs dispersed peakup ------------------------------------------------------------------------------------------------------------------------------------ 3 HD4174 STIS/N ACCUM 0.2X0.0 E230M 1978 1 1200 S MIN DUR 75% EXPAND UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD4174 STIS/N ACCUM 0.2X0.0 E230M 2707 1 500 S MIN DUR 75% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 5 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 3800 S MIN DUR 50% MAX DUR 200% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 8] Visit: 04 Visit Priority: Visit Requirements: BETWEEN 31-Jan-2003 AND 07-Feb-2003 On Hold Comments: Additional Comments: Phase 0.075 +/- 0.005 observation of eclipsing system Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD4174 STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.1 S CD Comments: From ETC run with sp=M2V, V=7.3, predicts S/N = 80 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD4174 STIS/C ACQ/PEA 0.2X0.0 G430L 4300 1 5.0 S CD K 6 Comments: From ETC run with sp=M2V, V=7.3, and 50% slit loss. Needs dispersed peakup ------------------------------------------------------------------------------------------------------------------------------------ 3 HD4174 STIS/N ACCUM 0.2X0.0 E230M 1978 1 2115 S MIN DUR 75% EXPAND UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD4174 STIS/N ACCUM 0.2X0.0 E230M 2707 1 1134 S MIN DUR 75% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 5 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 2360 S MIN DUR 50% MAX DUR 200% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 6 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 2360 S MIN DUR 50% MAX DUR 200% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 9] Visit: 05 Visit Priority: Visit Requirements: BETWEEN 12-Feb-2003 AND 18-Feb-2003 On Hold Comments: Additional Comments: Phase 0.150 +/- 0.005 observation of eclipsing system Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD4174 STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.1 S CD Comments: From ETC run with sp=M2V, V=7.3, predicts S/N = 80 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD4174 STIS/C ACQ/PEA 0.2X0.0 G430L 4300 1 5.0 S CD K 6 Comments: From ETC run with sp=M2V, V=7.3, and 50% slit loss. Needs dispersed peakup ------------------------------------------------------------------------------------------------------------------------------------ 3 HD4174 STIS/N ACCUM 0.2X0.0 E230M 1978 1 1610 S MIN DUR 75% MAX DUR 100% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD4174 STIS/N ACCUM 0.2X0.0 E230M 2707 1 921 S MIN DUR 75% MAX DUR 100% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 5 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 2360 S MIN DUR 50% MAX DUR 200% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 6 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 2360 S MIN DUR 50% MAX DUR 200% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 10] Visit: 06 Visit Priority: Visit Requirements: BETWEEN 20-Dec-2002 AND 02-Jan-2003 On Hold Comments: Additional Comments: Phase 0.045 +/- 0.013 observation of eclipsing system Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD4174 STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.1 S CD Comments: From ETC run with sp=M2V, V=7.3, predicts S/N = 80 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD4174 STIS/C ACQ/PEA 0.2X0.0 G430L 4300 1 5.0 S CD K 6 Comments: From ETC run with sp=M2V, V=7.3, an 50% slit loss. Needs dispersed peakup ------------------------------------------------------------------------------------------------------------------------------------ 3 HD4174 STIS/N ACCUM 0.2X0.0 E230M 2707 1 774 S MIN DUR 75% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD4174 STIS/N ACCUM 0.2X0.0 E230M 1978 1 1300 S MIN DUR 75% EXPAND UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 5 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 1800 S MIN DUR 25% MAX DUR 200% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 6 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 2800 S MIN DUR 50% MAX DUR 200% UV-MAM 6 A ------------------------------------------------------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 11] Visit: 07 Visit Priority: Visit Requirements: BETWEEN 17-Jan-2003 AND 30-Jan-2003 On Hold Comments: Additional Comments: Phase 0.104 +/- 0.005 observation of eclipsing system Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD4174 STIS/C ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.1 S CD Comments: From ETC run with sp=M2V, V=7.3, predicts S/N = 80 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD4174 STIS/C ACQ/PEA 0.2X0.0 G430L 4300 1 5.0 S CD K 6 Comments: From ETC run with sp=M2V, V=7.3, an 50% slit loss. Needs dispersed peakup ------------------------------------------------------------------------------------------------------------------------------------ 3 HD4174 STIS/N ACCUM 0.2X0.0 E230M 2707 1 774 S MIN DUR 75% UV-MAM 6 A Comments: Exposures based on IUE spectra ------------------------------------------------------------------------------------------------------------------------------------ 4 HD4174 STIS/N ACCUM 0.2X0.0 E230M 1978 1 1300 S MIN DUR 75% MAX DUR UV-MAM 6 A Comments: Exposures based on IUE spectra ------------------------------------------------------------------------------------------------------------------------------------ 5 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 1700 S MIN DUR 25% MAX DUR UV-MAM 6 A Comments: Exposures based on IUE spectra ------------------------------------------------------------------------------------------------------------------------------------ 6 HD4174 STIS/F ACCUM 0.2X0.0 E140M 1425 1 2760 S MIN DUR 50% MAX DUR UV-MAM 6 A Comments: Exposures based on IUE spectra ------------------------------------------------------------------------------------------------------------------------------------ 9487( 4) - 10/16/02 15:02 - [ 12] Summary Form for Proposal 9487 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F25ND3 0.2X0.06 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/NUV-MAMA STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 14-Mar-2002 AND 19-Jun-2002 BETWEEN 09-Jul-2003 AND 04-Oct-2003 MIN DUR 75% MAX DUR 120% EXPAND MIN DUR 75% MAX DUR 110% MIN DUR 50% MAX DUR 200% EXPAND BETWEEN 18-Aug-2002 AND 11-Sep-2002 MIN DUR 75% EXPAND MIN DUR 75% MIN DUR 50% MAX DUR 200% BETWEEN 16-Oct-2002 AND 22-Oct-2002 BETWEEN 31-Jan-2003 AND 07-Feb-2003 BETWEEN 12-Feb-2003 AND 18-Feb-2003 MIN DUR 75% MAX DUR 100% BETWEEN 20-Dec-2002 AND 02-Jan-2003 MIN DUR 25% MAX DUR 200% BETWEEN 17-Jan-2003 AND 30-Jan-2003 MIN DUR 75% MAX DUR MIN DUR 25% MAX DUR MIN DUR 50% MAX DUR ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G430L E230M E140M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD4174 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 4300 1978 2707 1425 ------------------------------------------------------------------------------------------------------------------------------------