5952( 4) - 07/27/95 15:14 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5952 Version: 4 Check-in Date: ********** 1.Proposal Title: Mass-loss and circumstellar composition of Alpha Sco from CS lines in Alpha Sco B ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Cool Stars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Prof. D. Reimers Hamburger Sternwarte, University of Hamburg CoI: Dr. R. Baade Hamburger Sternwarte, University of N Hamburg CoI: T. Kirsch Hamburger Sternwarte, University of N Hamburg CoI: Dr. H.-J. Hagen Hamburger Sternwarte, University of N Hamburg CoI: Prof. R.-P. Kudritzki University of Munich N ------------------------------------------------------------------------------------ 6. Abstract Antares is the only red supergiant - B star binary where both the red giant wind and the HII region of the B star within the wind can be resolved in the sky, while it is simultaneously possible to determine an accurate mass-loss rate from scattering of B star UV photons in the red giant wind in resonance lines of at least a dozen ions. Earlier attempts using IUE suffered severely from blending of all O eV lines with IS lines. Here we propose to observe 30 selected wavelength regions in the UV, which cover ~ 50 CS lines with the GHRS Echelle of Alpha Sco B with the aim (1) to separate CS P Cyg type lines formed in the wind of Alpha Sco A from IS lines, (2) to determine an accurate M supergiant mass-loss rate by analyzing lines from a dozen ions using the most advanced radiation transfer techniques, (3) to determine a possibly existing depletion pattern in the CS gas phase due to dust condensation, and finally (4) to compare this depletion pattern with that obtained from the IS lines in the same spectrum. ------------------------------------------------------------------------------------ 5952( 4) - 07/27/95 15:14 - [ 2] Observations Description ------------------------ We want to observe 30 selected wavelength regions with the GHRS Echelle A & B with the LSA. The selected windows are center wavelength = 1199 Angstroem ( SII, NI), 1240 (MgII), 1252 (SII), 1260 (SII,SiII,FeII), 1266 (FeII9, SII), 1275 (FeII9, CI), 1306 (SiII, OI), 1317 (NiII), 1335 (CII), 1359 (CuII), 1370 (NiII), 1393 (NiII), 1467 (NiII), 1526 (SiII), 1533 (SiII), 1550 (FeII), 1561 (FeII), 1565 (FeII), 1583 (FeII), 1610.5 (FeII), 1620 (FeII), 1670 (AlII), 1786.7 (FeII), 1808 (SiII), 1858 (AlIII), 2025.5 (ZnII, MgI), 2062 (ZnII, CrII), 2599.7 (FeII), 2616 (FeII), 3073 (TiII) With typical fluxes of 7 10 E-10 erg/(cm*cm)/s/Angstroem at 1250 Angstroem, 3 10 E-10 at 1700 and 10 E-10 at 2600, the typical exposure time is 2 minutes (1 to 4 minutes) for most wavelength regions to reach a S/N = 100. 30 wavelength windows require thus about 2 orbits each for Ech-A and Ech-B (visibility 52 min., 7x(2 min + 4 min OH)). One additional orbit will be necessary for TA of this extremely bright object into the LSA (Attenuated A 2 + Peakup) and for an IMAGE. Alpha Sco B has to be centered well into the LSA and an GHRS IMAGE has to be taken after TA in order to verify the exact position of the star in the aperture. This is essential in order to be able to model the line scattering problem correctly since the scattering CS envelope is extendend in the sky Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5952( 4) - 07/27/95 15:14 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD148479 STAR,B0-B2 V-IV RA=16H 26M 19.993S +/- 0.004S, B1950 V=5.17 DEC=-26D 19' 21.69" +/- 0.05" F(1250)=7 +/- 0.7 E-10 F(1700)=3 +/- 0.3 E-10 F(2600)=1 +/- 0.1 E-10 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1950 -0.00074 -0.020 0.0 5952( 4) - 07/27/95 15:14 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD148479 HRS ACQ 2.0 MIRROR-A2 1 1.8S ONBOARD ACQ for 2-42 Comments: EXPECT 10,000 CTS HENCE STEP-TIME 0.2 SEC. B COMPONENT (B2.5V,V=5.6) IS UV-BRIGHTER THAN A COMPONENT (M1.5Iab,V=1.6) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD148479 HRS IMAGE 2.0 MIRROR-A2 1 51.2S Comments: PROTOCOL OF ACTUAL OBJECT POSITION IN THE APERTURE ------------------------------------------------------------------------------------------------------------------------------------ 10 HD148479 HRS ACCUM 2.0 ECH-B31 1786.7 1 314S ------------------------------------------------------------------------------------------------------------------------------------ 11 HD148479 HRS ACCUM 2.0 ECH-B31 1808 FP-SPLIT=STD 1 314S ------------------------------------------------------------------------------------------------------------------------------------ 12 HD148479 HRS ACCUM 2.0 ECH-B30 1858 1 247S ------------------------------------------------------------------------------------------------------------------------------------ 13 HD148479 HRS ACCUM 2.0 ECH-B28 2025.5 FP-SPLIT=STD 1 132S ------------------------------------------------------------------------------------------------------------------------------------ 14 HD148479 HRS ACCUM 2.0 ECH-B27 2062 FP-SPLIT=STD 1 117S ------------------------------------------------------------------------------------------------------------------------------------ 15 HD148479 HRS ACCUM 2.0 ECH-B22 2599.7 1 77S ------------------------------------------------------------------------------------------------------------------------------------ 16 HD148479 HRS ACCUM 2.0 ECH-B21 2616 1 75S ------------------------------------------------------------------------------------------------------------------------------------ 17 HD148479 HRS ACCUM 2.0 ECH-B18 3073 FP-SPLIT=STD 1 685S ------------------------------------------------------------------------------------------------------------------------------------ 20 HD148479 HRS IMAGE 2.0 MIRROR-A1 1 256S NO SPLIT Comments: PROTOCOL OF ACTUAL OBJECT POSITION IN THE APERTURE ------------------------------------------------------------------------------------------------------------------------------------ 21 HD148479 HRS ACCUM 2.0 ECH-A47 1199 FP-SPLIT=STD 1 290S ------------------------------------------------------------------------------------------------------------------------------------ 22 HD148479 HRS ACCUM 2.0 ECH-A45 1240 FP-SPLIT=STD 1 155S ------------------------------------------------------------------------------------------------------------------------------------ 23 HD148479 HRS ACCUM 2.0 ECH-A45 1252 1 155S ------------------------------------------------------------------------------------------------------------------------------------ 24 HD148479 HRS ACCUM 2.0 ECH-A45 1260 1 155S ------------------------------------------------------------------------------------------------------------------------------------ 25 HD148479 HRS ACCUM 2.0 ECH-A44 1266 FP-SPLIT=STD 1 124S ------------------------------------------------------------------------------------------------------------------------------------ 26 HD148479 HRS ACCUM 2.0 ECH-A44 1275 FP-SPLIT=STD 1 124S ------------------------------------------------------------------------------------------------------------------------------------ 27 HD148479 HRS ACCUM 2.0 ECH-A43 1306 1 133S ------------------------------------------------------------------------------------------------------------------------------------ 28 HD148479 HRS ACCUM 2.0 ECH-A43 1317 1 133S ------------------------------------------------------------------------------------------------------------------------------------ 29 HD148479 HRS ACCUM 2.0 ECH-A42 1335 1 115S ------------------------------------------------------------------------------------------------------------------------------------ 5952( 4) - 07/27/95 15:14 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 30 HD148479 HRS ACCUM 2.0 ECH-A41 1359 1 136S ------------------------------------------------------------------------------------------------------------------------------------ 31 HD148479 HRS ACCUM 2.0 ECH-A41 1370 1 136S ------------------------------------------------------------------------------------------------------------------------------------ 32 HD148479 HRS ACCUM 2.0 ECH-A40 1393 1 124S ------------------------------------------------------------------------------------------------------------------------------------ 33 HD148479 HRS ACCUM 2.0 ECH-A38 1467 1 220S ------------------------------------------------------------------------------------------------------------------------------------ 34 HD148479 HRS ACCUM 2.0 ECH-A37 1526 1 289S ------------------------------------------------------------------------------------------------------------------------------------ 35 HD148479 HRS ACCUM 2.0 ECH-A37 1533 1 289S ------------------------------------------------------------------------------------------------------------------------------------ 36 HD148479 HRS ACCUM 2.0 ECH-A36 1550 1 347S ------------------------------------------------------------------------------------------------------------------------------------ 37 HD148479 HRS ACCUM 2.0 ECH-A36 1561 1 347S ------------------------------------------------------------------------------------------------------------------------------------ 38 HD148479 HRS ACCUM 2.0 ECH-A36 1565 1 347S ------------------------------------------------------------------------------------------------------------------------------------ 39 HD148479 HRS ACCUM 2.0 ECH-A35 1587 1 397S ------------------------------------------------------------------------------------------------------------------------------------ 40 HD148479 HRS ACCUM 2.0 ECH-A35 1610.5 1 395S ------------------------------------------------------------------------------------------------------------------------------------ 41 HD148479 HRS ACCUM 2.0 ECH-A35 1620 1 395S ------------------------------------------------------------------------------------------------------------------------------------ 42 HD148479 HRS ACCUM 2.0 ECH-A34 1670 1 650S ------------------------------------------------------------------------------------------------------------------------------------ 5952( 4) - 07/27/95 15:14 - [ 6] Summary Form for Proposal 5952 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ IMAGE ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Cool Stars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ for 2-42 NO SPLIT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-A2 ECH-B31 ECH-B30 ECH-B28 ECH-B27 ECH-B22 ECH-B21 ECH-B18 MIRROR-A1 ECH-A47 ECH-A45 ECH-A44 ECH-A43 ECH-A42 ECH-A41 ECH-A40 ECH-A38 ECH-A37 ECH-A36 ECH-A35 ECH-A34 ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD148479 ------------------------------------------------------------------------------------------------------------------------------------