5998( 5) - 11/27/95 14:21 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5998 Version: 5 Check-in Date: ********** 1.Proposal Title: The Evolution of Massive Stars: Closing the Loop Observationally in the Local Group ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Stellar Populations GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Philip Massey National Optical Astronomy Observatories ------------------------------------------------------------------------------------ 6. Abstract We are proposing to use OB associations in M31, M33, and NGC 6822 to determine how stellar evolution proceeds for high mass stars. What mass range turns into Wolf- Rayet stars rather than red supergiants? What is the evolutionary link between WN and WC stars? How are answers to these questions affected by metallicity? Over the past decade we have completed surveys of Wolf-Rayet stars in selected OB associations of these three galaxies. We also have data for determining the red supergiant content of these same regions. Although we have obtained UBV CCD data under subarcsecond conditions, and have extensive optical spectroscopy for the bluest stars, our interpretation of our HRDs is stymied by our inability to distinguish three crowded 40Mo of similar effective temperature from a single 90Mo star. We need the 10* improvement in resolving power (compared to our best ground- based efforts) offered by the refurbished HST. ------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 2] Observations Description ------------------------ We plan a single visit per OB association, which we will then observe in the F555W, F439W, and F336W filters. Our exposure times will be 160s, 2x400s, and 2x400s, respectively. Our observations through the F555W filter will be observed at the higher gains setting (ATD-GAIN=15) to prevent saturation on the brightest stars of interest. Real Time Justification ----------------------- None. Calibration Justification ------------------------- None. Additional Comments ------------------- We are specifying the target position to put the most crowded and interesting region on PC1, and then providing a range of acceptable ORIENTation angles to get as much of the OB association on the three WF chips as possible. The RPS2 software shows that all of these can be scheduled; if the reduction in scheduling flexibility (or problem with guide stars) renders any of these unschedulable in practice, than I will have to specify aternative pointings to retain most of the field of interest. ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M33-FLD1 EXT-CLUSTER, OB RA=01H 32M 56.13S +/- 1.0", 2000 V=14.0 Association DEC=30D 34' 37.5" +/- 1.0", B-V=0.0 PLATE-ID=00DV Comments: Target position is for PC1 and orient angle of 155D- 206D 2 M33-FLD3 EXT-CLUSTER, OB RA=01H 33M 38.97S +/- 1.0", 2000 V=14.0 Association DEC=30D 21' 00.9" +/- 1.0", B-V=0.0 PLATE-ID=00DV Comments: Target position is for PC1 and orient angle of 180D- 305D 3 M33-FLD4 EXT-CLUSTER, OB RA=01H 33M 39.17S +/- 1.0", 2000 V=14.0 Association DEC=30D 31' 31.5" +/- 1.0", B-V=0.0 PLATE-ID=00DV Comments: Target position is for PC1 and orient angle of 161D- 260D 4 M33-FLD6 EXT-CLUSTER, OB RA=01H 33M 59.03S +/- 1.0", 2000 V=14.0 Association DEC=30D 34' 24.7" +/- 1.0", B-V=0.0 PLATE-ID=00DV Comments: Target position is for PC1 and orient angle of 54D-74D 5 M33-FLD8 EXT-CLUSTER, OB RA=01H 35M 03.00S +/- 1.0", 2000 V=14.0 Association DEC=30D 41' 22.8" +/- 1.0", B-V=0.0 PLATE-ID=00DV Comments: Target position is for WFALL-FIX and orient angle of 97D-122D 6 M33-FLD7 EXT-CLUSTER, OB RA=01H 33M 47.60S +/- 1.0", 2000 V=14.0 Association DEC=30D 44' 15.1" +/- 1.0", B-V=0.0 PLATE-ID=00DV Comments: Target position is specified for WFALL-FIX and orient angle of 155D-205D 7 M33-FLD2 EXT-CLUSTER, OB RA=01H 33M 14.54S +/- 1.0", 2000 V=14.0 Association DEC=30D 29' 54.8" +/- 1.0", B-V=0.0 PLATE-ID=00DV Comments: Target position is for PC1 and orient angle of 40D- 100D 8 M31-OB69 EXT-CLUSTER, OB RA=00H 40M 58.00S +/- 1.0", 2000 V=14.0 Association DEC=41D 03' 12.8" +/- 1.0", B-V=0.0 PLATE-ID=0738 Comments: Target position is for PC1 and orient angle of 190D- 223D 5998( 5) - 11/27/95 14:21 - [ 4] Visit: 01 Visit Requirements: ORIENT 155D TO 206D 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 M33-FLD1 WFPC2 IMAGE PC1 F555W ATD-GAIN=15 1 160S ------------------------------------------------------------------------------------------------------------------------------------ 2 M33-FLD1 WFPC2 IMAGE PC1 F336W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 3 M33-FLD1 WFPC2 IMAGE PC1 F439W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 5] Visit: 02 Visit Requirements: ORIENT 180D TO 305D 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 M33-FLD3 WFPC2 IMAGE PC1 F555W ATD-GAIN=15 1 160S ------------------------------------------------------------------------------------------------------------------------------------ 2 M33-FLD3 WFPC2 IMAGE PC1 F336W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 3 M33-FLD3 WFPC2 IMAGE PC1 F439W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 6] Visit: 03 Visit Requirements: ORIENT 161D TO 260D On Hold Comments: Additional Comments: Prefer orientation near 194D Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M33-FLD4 WFPC2 IMAGE PC1 F555W ATD-GAIN=15 1 160S ------------------------------------------------------------------------------------------------------------------------------------ 2 M33-FLD4 WFPC2 IMAGE PC1 F336W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 3 M33-FLD4 WFPC2 IMAGE PC1 F439W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 7] Visit: 04 Visit Requirements: ORIENT 54D TO 74D On Hold Comments: Additional Comments: Prefer orientation near 63D Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M33-FLD6 WFPC2 IMAGE PC1 F555W ATD-GAIN=15 1 160S ------------------------------------------------------------------------------------------------------------------------------------ 2 M33-FLD6 WFPC2 IMAGE PC1 F336W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 3 M33-FLD6 WFPC2 IMAGE PC1 F439W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 8] Visit: 05 Visit Requirements: ORIENT 155D TO 205D 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 M33-FLD7 WFPC2 IMAGE WFALL- F555W ATD-GAIN=15 1 160S FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 M33-FLD7 WFPC2 IMAGE WFALL- F336W ATD-GAIN=7 1 800S FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 M33-FLD7 WFPC2 IMAGE WFALL- F439W ATD-GAIN=7 1 800S FIX ------------------------------------------------------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 9] Visit: 06 Visit Requirements: ORIENT 97D TO 122D On Hold Comments: Additional Comments: Prefer orientation near 108D Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M33-FLD8 WFPC2 IMAGE WFALL- F555W ATD-GAIN=15 1 160S FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 M33-FLD8 WFPC2 IMAGE WFALL- F336W ATD-GAIN=7 1 800S FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 M33-FLD8 WFPC2 IMAGE WFALL- F439W ATD-GAIN=7 1 800S FIX ------------------------------------------------------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 10] Visit: 07 Visit Requirements: ORIENT 40D TO 100D 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 M33-FLD2 WFPC2 IMAGE PC1 F555W ATD-GAIN=15 1 160S ------------------------------------------------------------------------------------------------------------------------------------ 2 M33-FLD2 WFPC2 IMAGE PC1 F336W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 3 M33-FLD2 WFPC2 IMAGE PC1 F439W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 11] Visit: 08 Visit Requirements: ORIENT 190D TO 223D 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 M31-OB69 WFPC2 IMAGE PC1 F555W ATD-GAIN=15 1 170S ------------------------------------------------------------------------------------------------------------------------------------ 2 M31-OB69 WFPC2 IMAGE PC1 F336W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 3 M31-OB69 WFPC2 IMAGE PC1 F439W ATD-GAIN=7 1 800S ------------------------------------------------------------------------------------------------------------------------------------ 5998( 5) - 11/27/95 14:21 - [ 12] Summary Form for Proposal 5998 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ATD-GAIN=15 ATD-GAIN=7 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Stellar Populations ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 155D TO 206D ORIENT 180D TO 305D ORIENT 161D TO 260D ORIENT 54D TO 74D ORIENT 155D TO 205D ORIENT 97D TO 122D ORIENT 40D TO 100D ORIENT 190D TO 223D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F336W F439W ------------------------------------------------------------------------------------------------------------------------------------ Target Names M33-FLD1 M33-FLD3 M33-FLD4 M33-FLD6 M33-FLD7 M33-FLD8 M33-FLD2 M31-OB69 ------------------------------------------------------------------------------------------------------------------------------------