5911( 4) - 11/21/95 09:09 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5911 Version: 4 Check-in Date: ********** 1.Proposal Title: MASSIVE STAR FORMATION IN M31 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Stellar Populations GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Eugene Magnier Astronomical Institute, University of Amsterdam CoI: Walter H.G. Lewin Massachusetts Institute of Technology N CoI: Jan van Paradijs University of Amsterdam N CoI: Paul Hodge University of Washington N CoI: Paulo Battinelli Observatory of Rome N ------------------------------------------------------------------------------------ 6. Abstract We propose to observe 5 fields along the NE spiral arm region of NGC224 (M31) with the WFPC-2 using the F160BW, F336W, F439W, and F555W filters to obtain high quality color-magnitude diagrams of the sites of recent star formation. With the high resolution and far UV image capabilities of HST, we will be able to detect the main sequence down to M_V ~ 0.0, and make useful determinations of the temperatures of even the hottest stars. These data will allow us to study the global pattern of the star formation and explore the current descriptions of star formation processes. We will also be able to study the variations of the IMF from location to location along the spiral arm. Finally, these data will be vital for efforts to improve the calibration of the far UV color to temperature calibration for M31. ------------------------------------------------------------------------------------ 5911( 4) - 11/21/95 09:09 - [ 2] Observations Description ------------------------ We propose to take F160BW, F336W (U), F439W (B), and F555 (V) images of 5 fields with exposure times of 560, 440, 160, and 140 seconds respectively. We have split the F160BW and F336W exposures into a long and a short exposure, with the second exposure offset from the field center. This is to 1) avoid CR problems 2) allow elimination of hot pixels, 3) allow for correcting the undersampling of the pixels, and 4) increase the dynamic range of the total exposures. We have chosen these four filters in order to make a useful determination of the temperatures of the stars. For the hottest (and brightest) stars, the Far-UV data is necessary to determine the temperature. For the moderately hot and moderately faint stars, the F255 - V color is sufficient. For the faintest, and coolest stars we hope to detect (spectral type B5V), the B-V color will be sufficient to determine the temperature. We have also chosen this set of four filters to allow for a determination of the extinction to the OB associations. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5911( 4) - 11/21/95 09:09 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC224-VDB- EXT-CLUSTER, OB RA=0H 44M 44.4S +/- 0.1S, 2000 V=17 OB042-POS01 Association, Star DEC=41D 27' 41.3" +/- 0.2" B-V=0.0 Forming Region E(B-V)=0.2 Comments: star cluster. 10 - 100 stars with V=16 and fainter. 2 NGC224-VDB- EXT-CLUSTER, OB RA=0H 44M 49.5S +/- 0.1S, 2000 V=17 OB042-POS02 Association, Star DEC=41D 29' 06.5" +/- 0.2" B-V=0.0 Forming Region E(B-V)=0.2 Comments: star cluster. 10 - 100 stars with V=16 and fainter. 3 NGC224-VDB- EXT-CLUSTER, OB RA=0H 44M 57.8S +/- 0.1S, 2000 V=17 OB042-POS03 Association, Star DEC=41D 30' 59.1" +/- 0.2" B-V=0.0 Forming Region E(B-V)=0.2 Comments: star cluster. 10 - 100 stars with V=16 and fainter. 4 NGC224-VDB- EXT-CLUSTER, OB RA=0H 45M 09.2S +/- 0.1S, 2000 V=17 OB048-POS01 Association, Star DEC=41D 34' 38.4" +/- 0.2" B-V=0.0 Forming Region E(B-V)=0.2 Comments: star cluster. 10 - 100 stars with V=16 and fainter. 5 NGC224-VDB- EXT-CLUSTER, OB RA=0H 45M 11.9S +/- 0.1S, 2000 V=17 OB048-POS02 Association, Star DEC=41D 37' 04.7" +/- 0.2" B-V=0.0 Forming Region E(B-V)=0.2 Comments: star cluster. 10 - 100 stars with V=16 and fainter. 5911( 4) - 11/21/95 09:09 - [ 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 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 500S POS TARG 0.0, 0.0 OB042-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 60S POS TARG 0.425, -0.425 OB042-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 400S POS TARG 0.425, -0.425 OB042-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 40S POS TARG 0.0, 0.0 OB042-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC224-VDB- WFPC2 IMAGE WFALL- F439W CR-SPLIT=NO 1 160S POS TARG 0.0, 0.0 OB042-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC224-VDB- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 140S POS TARG 0.0, 0.0 OB042-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5911( 4) - 11/21/95 09:09 - [ 5] Visit: 02 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 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 500S POS TARG 0.0, 0.0 OB042-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 60S POS TARG 0.425, -0.425 OB042-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 400S POS TARG 0.425, -0.425 OB042-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 40S POS TARG 0.0, 0.0 OB042-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC224-VDB- WFPC2 IMAGE WFALL- F439W CR-SPLIT=NO 1 160S POS TARG 0.0, 0.0 OB042-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC224-VDB- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 140S POS TARG 0.0, 0.0 OB042-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5911( 4) - 11/21/95 09:09 - [ 6] Visit: 03 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 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 500S POS TARG 0.0, 0.0 OB042-POS03 FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 60S POS TARG 0.425, -0.425 OB042-POS03 FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 400S POS TARG 0.425, -0.425 OB042-POS03 FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 40S POS TARG 0.0, 0.0 OB042-POS03 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC224-VDB- WFPC2 IMAGE WFALL- F439W CR-SPLIT=NO 1 160S OB042-POS03 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC224-VDB- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 140S OB042-POS03 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5911( 4) - 11/21/95 09:09 - [ 7] Visit: 04 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 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 500S POS TARG 0.0, 0.0 OB048-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 60S POS TARG 0.425, -0.425 OB048-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 400S POS TARG 0.425, -0.425 OB048-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 40S POS TARG 0.0, 0.0 OB048-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC224-VDB- WFPC2 IMAGE WFALL- F439W CR-SPLIT=NO 1 160S OB048-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC224-VDB- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 140S OB048-POS01 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5911( 4) - 11/21/95 09:09 - [ 8] Visit: 05 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 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 500S POS TARG 0.0, 0.0 OB048-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC224-VDB- WFPC2 IMAGE WFALL- F160BW CR-SPLIT=NO 1 60S POS TARG 0.425, -0.425 OB048-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 400S POS TARG 0.425, -0.425 OB048-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC224-VDB- WFPC2 IMAGE WFALL- F336W CR-SPLIT=NO 1 40S POS TARG 0.0, 0.0 OB048-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC224-VDB- WFPC2 IMAGE WFALL- F439W CR-SPLIT=NO 1 160S OB048-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC224-VDB- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 140S OB048-POS02 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5911( 4) - 11/21/95 09:09 - [ 9] Summary Form for Proposal 5911 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Stellar Populations ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements POS TARG 0.0, 0.0 POS TARG 0.425, -0.425 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160BW F336W F439W F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC224-VDB-OB042-POS01 NGC224-VDB-OB042-POS02 NGC224-VDB-OB042-POS03 NGC224-VDB-OB048-POS01 NGC224-VDB-OB048-POS02 ------------------------------------------------------------------------------------------------------------------------------------