6185( 0) - 07/18/95 20:42 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6185 Version: ********** Check-in Date: ********** 1.Proposal Title: Baades Window Proper Motions ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Stellar Populations GTO/AST 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Prof. William H. Jefferys University of Texas CoI: Prof. William F. van Altena Yale University N CoI: Dr. Rene A. Mendez Yale University Y ------------------------------------------------------------------------------------ 6. Abstract We propose the first proper motion study of the bulge, to magnitude below its turnoff and into the main sequence, by using HST archival data as first epoch exposures and by obtaining a new series of second epoch exposures within Baade's low -extinction window. By using recently developed centering routines specifically designed to deal with crowded fields taken with the HST, we expect to obtain a mean positional accuracy of 5 milli-arc-seconds per object which at the Galactic center, translates into a tangential velocity error of 20 km/sec. Since typical velocity dispersions in the bulge are on the order of 110 km/sec, we have a good velocity resolution to determine the intrinsic kinematical properties of the Bulge. A Galactic Structure modelling code will be used to aid in the interpretation of the proper motion distributions in terms of a physically-relevant kinematical description of the bulge and the foreground disk, therefore avoiding simplistic assumptions about the distribution of stars along the line of sight as done in previous studies. ------------------------------------------------------------------------------------ 6185( 0) - 07/18/95 20:42 - [ 2] Observations Description ------------------------ These observations constitute a 2nd epoch set of exposures to determine the tangential kinematics of the bulge. Therefore, positional as well as limiting magnitude agreement between the already obtained 1st epoch (archival data) and the proposed 2nd epoch observations is EXTREMELY IMPORTANT. The archival data are those of projects ID=1106 and ID=4085, consisting of ten-1,000 sec exposures, two-800 sec exposures, and two-200 sec exposures through filter F555W, twelve-1,000 sec exposures through filter F785LP, and two-200 sec exposures in this same filter. A 1,000 sec exposure through the WFC-F555W has an approximate limiting magnitude of 22.9 mag. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- Positional match with proposals ID= 1106 and ID= 4085 is CRUCIAL. The Position specified below was taken from the fields RA_TARG and DEC_TARG on the headers of the frames taken under those two proposals. It was assumed that this position refers to the pyramid apex (see Aperture and Special_Requirements on exposure logsheet below). ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: Prof. William F. van Altena*Yale University*Astronomy Department*P.O. Box 208101*New Haven, CT 06520-8101 Ship Via: UPS Email: vanalten@astro.yale.edu , ------------------------------------------------------------------------------------ 6185( 0) - 07/18/95 20:42 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD-180310 STELLAR CLUSTER, RA=18H 3M 10.00S +/- 0.01S, DEC= J2000 V= 22.5 +/- 0.5 -295143 Globular Cluster -29D 51' 43.0" +/- 0.1" B-V= 1.4 +/- 0.2 E(B-V)= 0.49 +/- 0.07 Comments: Positional match with proposals ID= 1106 and ID= 4085 is CRUCIAL. The specified Target Coordinates were taken from the fields RA_TARG and DEC_TARG on the headers of the frames taken under those two proposals. It was assumed that this position refers to the pyramid apex (see Aperture and Special_Requirements on exposure logsheet below). 6185( 0) - 07/18/95 20:42 - [ 4] Visit: 01 Visit Requirements: ORIENTation 84.4D TO 85.4D On Hold Comments: Additional Comments: ORIENTation angle taken from (PA_V3+180) [mod2Pi] from the headers on proposals ID= 1106 AND 4085 (which give PA_V3=265.062 [deg]). A nominal uncertainty +/- 0.5 [deg] has been used. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 FIELD- WFPC2 IMAGE WFALL- F555W 1 400S POSition TARGet 13,15 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 2 FIELD- WFPC2 IMAGE WFALL- F555W 1 400S POSition TARGet 12,14 180310- FIX 295143 Comments: A small (10-pixels) shift has been applied to improve photometry and astrometry by avoiding an exposure on the very same place of the chip. The same comment applies to ALL the exposures below with POS TARG 12,14 or POS TARG 14,16, while POS TARG 13,15 is the "centered" exposure. ------------------------------------------------------------------------------------------------------------------------------------ 3 FIELD- WFPC2 IMAGE WFALL- F555W 1 400S POSition TARGet 14,16 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 4 FIELD- WFPC2 IMAGE WFALL- F555W 2 40S POSition TARGet 13, 15 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 5 FIELD- WFPC2 IMAGE WFALL- F555W 4 200S POSition TARGet 13,15 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 6 FIELD- WFPC2 IMAGE WFALL- F814W 1 400S POSition TARGet 13,15 180310- FIX 295143 Comments: Filter F814W has been chosen, rather than F785LP used in the 1st epoch observations, in order to have a filter more closely related to the Johnson-Cousins I filter (WFPC2 Instrument handbook, Version 2.0, May 1994). ------------------------------------------------------------------------------------------------------------------------------------ 7 FIELD- WFPC2 IMAGE WFALL- F814W 1 400S POSition TARGet 12,14 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 8 FIELD- WFPC2 IMAGE WFALL- F814W 1 400S POSition TARGet 14,16 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 6185( 0) - 07/18/95 20:42 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 9 FIELD- WFPC2 IMAGE WFALL- F814W 2 40S POSition TARGet 13,15 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 10 FIELD- WFPC2 IMAGE WFALL- F814W 2 200S POSition TARGet 13,15 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 11 FIELD- WFPC2 IMAGE WFALL- F814W 1 200S POSition TARGet 12,14 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 12 FIELD- WFPC2 IMAGE WFALL- F814W 1 200S POSition TARGet 14,16 180310- FIX 295143 ------------------------------------------------------------------------------------------------------------------------------------ 6185( 0) - 07/18/95 20:42 - [ 6] Summary Form for Proposal 6185 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GTO/AST ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Stellar Populations ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENTation 84.4D TO 85.4D POSition TARGet 13,15 POSition TARGet 12,14 POSition TARGet 14,16 POSition TARGet 13, 15 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names FIELD-180310-295143 ------------------------------------------------------------------------------------------------------------------------------------