8455( 4) - 07/26/99 11:37 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8455 Version: 4 Check-in Date: 26-Jul-1999 11:37:04 1.Proposal Title: WFPC2 Cycle 8: Photometry of Very Red Stars ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle CAL/WF2 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Stefano Casertano Space Telescope Science Institute CoI: Sylvia Baggett STScI N ------------------------------------------------------------------------------------ 5. Abstract Verify the photometric calibration of WFPC2 filters and obtain estimated color terms (HST --> Johnson) for late M stars. ------------------------------------------------------------------------------------ Observations Description ------------------------ WFPC2 imaging (F439W, F555W, F675W, F814w) of two well-known M dwarfs, VB8 and VB10, for which ground-based measurements in the Johnson filters exist. Use two different y positions to account for CTE. The current calibration is based on white dwarf and solar analog data, which are insufficient to produce an accurate calibration for cool red stars (late K and M) in broad-band filters. The calibration of cool stars is especially difficult at the red end (F814W), because their spectra can rise quickly where the DQE drops substantially (increasing the uncertainty in the synthetic magnitude calibration). The observations of two well-studied late M stars, VB8 and VB 10 will provide a direct empirical calibration of these effects and reduce the uncertainties in the photometric response of WFPC2 for very red stars. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- Fraction of GO/GTO programs supported, < 10%. 0.2FTE, outsourcing candidate. Accuracy goals better than 0.03 magnitudes. ------------------------------------------------------------------------------------ 8455( 4) - 07/26/99 11:37 - [ 2] Data Distribution Paper Products: NO Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8455( 4) - 07/26/99 11:37 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 VB8 CALIBRATION, RA=16H 52M 55.25S +/- 0.1S, DEC= B1950 B = 19.00 PHOTOMETRIC -8D 18' 8.5" +/- 0.1" V = 16.80 R = 14.65 I = 12.24 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1944.23 -0.05376 -0.85568 0.0 2 VB10 CALIBRATION, RA=19H 16M 58.10S +/- 0.1S, J2000 B = 19.63 PHOTOMETRIC DEC=+5D 9' 11.1" +/- 0.1" V = 17.50 R = 15.3 I = 12.80 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.00 -0.03082 -1.41707 0.0 8455( 4) - 07/26/99 11:37 - [ 4] Visit: 01 Visit Priority: Visit Requirements: BETWEEN 01-OCT-1999 AND 01-MAR-2000 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 VB8 WFPC2 IMAGE WF3 F439W 1 100 S SAME ALIGNMENT 1-8 ------------------------------------------------------------------------------------------------------------------------------------ 2 VB8 WFPC2 IMAGE WF3 F439W 1 200 S ------------------------------------------------------------------------------------------------------------------------------------ 3 VB8 WFPC2 IMAGE WF3 F555W 1 10 S ------------------------------------------------------------------------------------------------------------------------------------ 4 VB8 WFPC2 IMAGE WF3 F555W 1 20 S ------------------------------------------------------------------------------------------------------------------------------------ 5 VB8 WFPC2 IMAGE WF3 F675W 1 5 S ------------------------------------------------------------------------------------------------------------------------------------ 6 VB8 WFPC2 IMAGE WF3 F675W 1 10 S ------------------------------------------------------------------------------------------------------------------------------------ 7 VB8 WFPC2 IMAGE WF3 F814W 1 2 S ------------------------------------------------------------------------------------------------------------------------------------ 8 VB8 WFPC2 IMAGE WF3 F814W 1 5 S ------------------------------------------------------------------------------------------------------------------------------------ 11 VB8 WFPC2 IMAGE WF3 F439W 1 100 S POS TARG 0, 20 SAME ALIGNMENT 11-18 ------------------------------------------------------------------------------------------------------------------------------------ 12 VB8 WFPC2 IMAGE WF3 F439W 1 200 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 13 VB8 WFPC2 IMAGE WF3 F555W 1 10 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 14 VB8 WFPC2 IMAGE WF3 F555W 1 20 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 17 VB8 WFPC2 IMAGE WF3 F814W 1 2 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 18 VB8 WFPC2 IMAGE WF3 F814W 1 5 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 8455( 4) - 07/26/99 11:37 - [ 5] Visit: 02 Visit Priority: Visit Requirements: BETWEEN 01-OCT-1999 AND 01-MAR-2000 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 VB10 WFPC2 IMAGE WF3 F439W 1 100 S SAME ALIGNMENT 1-8 ------------------------------------------------------------------------------------------------------------------------------------ 2 VB10 WFPC2 IMAGE WF3 F439W 1 200 S ------------------------------------------------------------------------------------------------------------------------------------ 3 VB10 WFPC2 IMAGE WF3 F555W 1 10 S ------------------------------------------------------------------------------------------------------------------------------------ 4 VB10 WFPC2 IMAGE WF3 F555W 1 20 S ------------------------------------------------------------------------------------------------------------------------------------ 5 VB10 WFPC2 IMAGE WF3 F675W 1 5 S ------------------------------------------------------------------------------------------------------------------------------------ 6 VB10 WFPC2 IMAGE WF3 F675W 1 10 S ------------------------------------------------------------------------------------------------------------------------------------ 7 VB10 WFPC2 IMAGE WF3 F814W 1 2 S ------------------------------------------------------------------------------------------------------------------------------------ 8 VB10 WFPC2 IMAGE WF3 F814W 1 5 S ------------------------------------------------------------------------------------------------------------------------------------ 11 VB10 WFPC2 IMAGE WF3 F439W 1 100 S POS TARG 0, 20 SAME ALIGNMENT 11-18 ------------------------------------------------------------------------------------------------------------------------------------ 12 VB10 WFPC2 IMAGE WF3 F439W 1 200 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 13 VB10 WFPC2 IMAGE WF3 F555W 1 10 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 14 VB10 WFPC2 IMAGE WF3 F555W 1 20 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 17 VB10 WFPC2 IMAGE WF3 F814W 1 2 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 18 VB10 WFPC2 IMAGE WF3 F814W 1 5 S SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ 8455( 4) - 07/26/99 11:37 - [ 6] Summary Form for Proposal 8455 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WF3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category CAL/WF2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-OCT-1999 AND 01-MAR-2000 SAME ALIGNMENT 1-8 POS TARG 0, 20 SAME ALIGNMENT 11-18 SAME POS AS 11 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F439W F555W F675W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names VB8 VB10 ------------------------------------------------------------------------------------------------------------------------------------