! $Id: 3856,v 4.1 1994/07/27 14:22:06 pepsa Exp $ coverpage: title_1: A CRITICAL TEST OF THE GALACTIC ESCAPE VELOCITY AT R(SUN)-CONT OF title_2: 2428 sci_cat: STELLAR POPULATIONS sci_subcat: ASTROMETRY proposal_for: GO longterm: 3 cont_id: 2428 pi_fname: DARRELL pi_mi: J. pi_lname: MACCONNELL pi_inst: COMPUTER SCIENCES CORPORATION pi_country: USA pi_phone: 301-338-4800 hours_pri: 8.30 num_pri: 14 fgs: Y time_crit: Y off_fname: ROSELLE off_lname: HARDE off_title: SR. CONTRACTS ADMIN. off_inst: COMPUTER SCIENCES CORPORATION off_addr_1: SYSTEM SCIENCES DIVISION off_addr_2: 4061 POWDER MILL ROAD off_city: CALVERTON off_state: MD off_zip: 20705 off_country: USA off_phone: 301-572-3637 ! end of coverpage abstract: line_1: We propose to measure the trigonometric parallaxes and proper motions of the line_2: three high-proper motion stars which Carney, Latham, and Laird (1988) identify line_3: as having the most extreme velocities known in the galactic rest frame. Using line_4: these stars, they conclude that the local value of the escape velocity, V(esc), line_5: is at least 500 k/s, and this leads them to draw other important conclusions line_6: regarding the distribution of mass in the galactic disk. However, their line_7: assigned distances, and hence the tangential velocities and V(esc) value, line_8: depend on uncertain photometric corrections and reddening estimates. The line_9: photometric distances they find are in the range 400-550 pc, so the parallaxes line_10: are expected to be of the order of 2 milliarcsec. If these distances are line_11: approximately correct, it will be possible to measure them at the 4-sigma level line_12: using an FGS on the HST. It will be of great interest if the parallaxes are line_13: smaller than the estimates of Carney, et al., since this would lead to a higher line_14: value for the escape velocity and a larger mass for the galaxy. Alternatively, line_15: if the parallaxes are found to be larger than they adopted, either V(esc) is line_16: considerably smaller than 500 k/s or these three stars are not the most app- line_17: ropriate for setting a limit on V(esc). NOTE added 16-Apr-1991: Three targets line_18: changed to two, G166-37 and G233-27. This is Cycle 3 POS mode only. line_19: NOTE added 09-Mar-1992: Target G233_27 dropped after TRANS obs. failed due to ! ! end of abstract general_form_proposers: lname: OSBORN fname: WAYNE mi: H. inst: CENTRAL MICHIGAN UNIVERSITY country: USA ! lname: MACCONNELL fname: DARRELL title: P.I. mi: J. inst: COMPUTER SCIENCES CORPORATION country: USA ! ! end of general_form_proposers block general_form_text: ! question: 3 section: 1 line_1: We plan to observe two high-pm stars and 7 to 9 reference line_2: stars for each within the 4'x5' field of FGS 3 line_3: and its 180-deg inverse. They are to be observed during line_4: 5 epochs covering two years near the maximum parallax line_5: factor for each +/- one month. A program star line_6: and its reference frame will be observed a total of 18 times: line_7: a series of nine observations at one max. and a series of line_8: six observations at the other. Given the expected accuracy line_9: of 0.0016 arcsec for a single observ. with an FGS, the full line_10: series should allow determinations of parallaxes with error line_11: of no more than 0.0005 arcsec, which is only 25% of the ex- line_12: pected value of the parallaxes of these stars, and of proper line_13: motions at least as accurate as those currently available. line_14: Proposal split was suggested by SPB & SPSS to speed up pro- line_15: cessing and scheduling of TRANS observations in proposal 2428. line_16: POS mode observations contained in this proposal are line_17: conditional on the results of the TRANS mode observations--- line_18: the stars must be single. If a different astrometer is chosen line_19: than the one currently specified (FGS 3), this proposal line_20: will be revised. ! !end of general form text general_form_address: lname: MACCONNELL fname: DARRELL mi: J. title: DR. category: PI inst: COMPUTER SCIENCES CORP. addr_1: 3700 SAN MARTIN DRIVE city: BALTIMORE state: MD zip: 21218 country: USA ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: G166-37 descr_1: A,136 pos_1: PLATE-ID = 01TM, pos_2: RA = 14H 34M 51.2S +/- 0.1S, pos_3: DEC = +25D 10' 9" +/- 1" equinox: 2000 pm_or_par: Y pos_epoch_bj: J pos_epoch_yr: 1982.40 ra_pm_val: -0.000221 dec_pm_val: -0.3300 an_prlx_val: 0.0055 an_prlx_unct: 0.0020 rv_or_z: V = +369 comment_1: PARALLAX PROGRAM STAR fluxnum_1: 1 fluxval_1: V = 12.66 +/- 0.02 fluxnum_2: 2 fluxval_2: B = 13.34 +/- 0.02 ! targnum: 2 name_1: G166A-REF descr_1: A,134 pos_1: PLATE-ID = 01TM, pos_2: RA = 14H 34M 51.5S +/- 0.2S, pos_3: DEC = +25D 8' 9" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.40 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 12.3 +/- 0.5 ! targnum: 3 name_1: G166B-REF descr_1: ^ pos_1: PLATE-ID = 01TM, pos_2: RA = 14H 34M 57.6S +/- 0.2S, pos_3: DEC = +25D 10' 13" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.40 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 14.5 +/- 0.5 ! targnum: 4 name_1: G166L-REF descr_1: ^ pos_1: PLATE-ID = 01TM, pos_2: RA = 14H 34M 57.1S +/- 0.2S, pos_3: DEC = +25D 11' 46" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.40 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 14.6 +/- 0.5 ! targnum: 5 name_1: G166I-REF descr_1: ^ pos_1: PLATE-ID = 01TM, pos_2: RA = 14H 34M 48.0S +/- 0.2S, pos_3: DEC = +25D 8' 3" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.40 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 15.5 +/- 0.5 ! targnum: 6 name_1: G16-25 descr_1: A,136 pos_1: PLATE-ID = 01GB, pos_2: RA = 16H 1M 22.1S +/- 0.1S, pos_3: DEC = +5D 23' 48" +/- 1" equinox: 2000 pm_or_par: Y pos_epoch_bj: J pos_epoch_yr: 1982.50 ra_pm_val: -0.021535 dec_pm_val: -0.2880 an_prlx_val: 0.0033 an_prlx_unct: 0.0010 rv_or_z: V = -100 comment_1: PARALLAX PROGRAM STAR fluxnum_1: 1 fluxval_1: V = 13.34 +/- 0.02 fluxnum_2: 2 fluxval_2: B = 13.94 +/- 0.05 ! targnum: 7 name_1: G1625A-REF descr_1: A,134 pos_1: PLATE-ID = 01GB, pos_2: RA = 16H 1M 27.0S +/- 0.2S, pos_3: DEC = +5D 24' 3" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.50 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 15.5 +/- 0.5 ! targnum: 8 name_1: G1625B-REF descr_1: ^ pos_1: PLATE-ID = 01GB, pos_2: RA = 16H 1M 19.5S +/- 0.2S, pos_3: DEC = +5D 22' 52" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.50 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 15.8 +/- 0.5 ! targnum: 9 name_1: G1625C-REF descr_1: ^ pos_1: PLATE-ID = 01GB, pos_2: RA = 16H 1M 20.7S +/- 0.2S, pos_3: DEC = +5D 24' 51" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.50 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 15.5 +/- 0.5 ! targnum: 10 name_1: G1625F-REF descr_1: A,134 pos_1: PLATE-ID = 01GB, pos_2: RA = 16H 1M 12.2S +/- 0.2S, pos_3: DEC = +5D 24' 8" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.50 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 14.7 +/- 0.5 ! targnum: 11 name_1: G1625G-REF descr_1: ^ pos_1: PLATE-ID = 01GB, pos_2: RA = 16H 1M 12.1S +/- 0.2S, pos_3: DEC = +5D 23' 17" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.50 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 15.5 +/- 0.5 ! targnum: 14 name_1: G1625I-REF descr_1: ^ pos_1: PLATE-ID = 01GB, pos_2: RA = 16H 1M 25.2S +/- 0.2S, pos_3: DEC = +5D 25' 22" +/- 2" equinox: 2000 pos_epoch_bj: J pos_epoch_yr: 1982.50 comment_1: PARALLAX REFERENCE STAR fluxnum_1: 1 fluxval_1: V = 14.6 +/- 0.5 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE sequence_2: G166-SEQ1 targname: G166-37 config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 50S priority: 1 param_1: DATA-RATE = 32 req_1: SEQ 1-6 NON-INT ! linenum: 2.000 sequence_1: DEFINE sequence_2: G166-SEQ1 targname: G166A-REF config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 50S priority: 1 param_1: DATA-RATE = 32 ! linenum: 3.000 sequence_1: DEFINE sequence_2: G166-SEQ1 targname: G166B-REF config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 100S priority: 1 param_1: DATA-RATE = 32 req_1: DO FOR TARGS 3-5; req_2: GROUP-FGS 1-6 WITHIN 50M ! linenum: 4.000 sequence_1: DEFINE sequence_2: G166-SEQ1 targname: G166A-REF config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 50S priority: 1 param_1: DATA-RATE = 32 ! linenum: 5.000 sequence_1: DEFINE sequence_2: G166-SEQ1 targname: G166B-REF config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 100S priority: 1 param_1: DATA-RATE = 32 ! linenum: 6.000 sequence_1: DEFINE sequence_2: G166-SEQ1 targname: G166-37 config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 50S priority: 1 param_1: DATA-RATE = 32 ! linenum: 7.000 sequence_1: DEFINE sequence_2: G1625-SEQ1 targname: G16-25 config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 50S priority: 1 param_1: DATA-RATE = 32 req_1: SEQ 7-12 NON-INT ! linenum: 8.000 sequence_1: DEFINE sequence_2: G1625-SEQ1 targname: G1625I-REF config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 50S priority: 1 param_1: DATA-RATE = 32 ! linenum: 9.000 sequence_1: DEFINE sequence_2: G1625-SEQ1 targname: G1625A-REF config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 100S priority: 1 param_1: DATA-RATE = 32 req_1: DO FOR TARGS 7-11; req_2: GROUP-FGS 7-11 WITHIN 50M; ! linenum: 11.000 sequence_1: DEFINE sequence_2: G1625-SEQ1 targname: G1625F-REF config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 50S priority: 1 param_1: DATA-RATE = 32 ! linenum: 12.000 sequence_1: DEFINE sequence_2: G1625-SEQ1 targname: G16-25 config: FGS opmode: POS aperture: 3 sp_element: F583W num_exp: 1 time_per_exp: 50S priority: 1 param_1: DATA-RATE = 32 ! linenum: 13.000 sequence_1: USE sequence_2: G166-SEQ1 req_1: SEQ 13-18 NO GAP; req_2: AT 19-FEB-94 +/- 4D; req_3: CYCLE 4 / 13-18 comment_1: LINES 13-18 NEED TO BE SCHEDULED comment_2: DURING SUCCESSIVE ORBITS comment_3: TARGET G166-37 TO BE OBSERVED comment_4: AT START AND END OF EACH ORBIT ! linenum: 14.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 15.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 16.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 17.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 18.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 19.000 sequence_1: USE sequence_2: G166-SEQ1 req_1: GROUP 19-27 WITHIN 3D; req_2: AT 14-JUL-94 +/- 3D; req_3: CYCLE 4 / 19-27 comment_1: LINES 19-27 NEED TO BE SCHEDULED comment_2: DURING SUCCESSIVE ORBITS comment_3: TARGET G166-37 TO BE OBSERVED comment_4: AT START AND END OF EACH ORBIT ! linenum: 20.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 21.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 22.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 23.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 24.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 25.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 26.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 27.000 sequence_1: USE sequence_2: G166-SEQ1 ! linenum: 28.000 sequence_1: USE sequence_2: G1625-SEQ1 req_1: SEQ 28-33 NO GAP; req_2: AT 22-FEB-94 +/- 30D; req_3: CYCLE 4 / 28-33 comment_1: LINES 28-33 NEED TO BE SCHEDULED comment_2: DURING SUCCESSIVE ORBITS comment_3: TARGET G16-25 TO BE OBSERVED comment_4: AT START AND END OF EACH ORBIT ! linenum: 29.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 30.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 31.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 32.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 33.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 34.000 sequence_1: USE sequence_2: G1625-SEQ1 req_1: GROUP 34-42 WITHIN 3D; req_2: AT 25-AUG-94 +/- 30D; req_3: CYCLE 4 / 34-42 comment_1: LINES 34-42 NEED TO BE SCHEDULED comment_2: DURING SUCCESSIVE ORBITS comment_3: TARGET G16-25 TO BE OBSERVED comment_4: AT START AND END OF EACH ORBIT ! linenum: 35.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 36.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 37.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 38.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 39.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 40.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 41.000 sequence_1: USE sequence_2: G1625-SEQ1 ! linenum: 42.000 sequence_1: USE sequence_2: G1625-SEQ1 ! ! end of exposure logsheet ! No scan data records found