! $Id: 5174,v 4.1 1994/07/27 15:43:53 pepsa Exp $ coverpage: title_1: ASTROMETRIC COMPANION SEARCH - CYCLE 4 sci_cat: STELLAR ASTROPHYSICS sci_subcat: ASTROMETRY proposal_for: GTO/AST cont_id: 1003 pi_fname: WILLIAM pi_mi: H. pi_lname: JEFFERYS pi_inst: TEXAS, UNIVERSITY OF pi_country: USA pi_phone: 512-471-4461 keywords_1: LOW-MASS COMPANIONS; `UNSEEN' COMPANIONS; ASTROMETRIC keywords_2: COMPANIONS; STELLAR PERTURBATONS; EXTRASOLAR PLANETS hours_pri: 10.29 num_pri: 6 time_crit: X pi_position: PROFESSOR OF ASTRONO ! end of coverpage abstract: line_1: One of groundbased, long-focus photographic astrometry's most challenging and line_2: most challenged research activities has been the search for "unseen" companions line_3: to nearby stars based upon analyses of perturbations in their observed proper line_4: motions. line_6: We propose to examine with FGS in the TRANS mode six late-type line_7: dwarf stars claimed to have low-mass companions of magnitudes and angular line_8: separations such as to make direct detection by FGS scans feasible. Any direct line_9: detection would not only extend importantly our knowledge on stars of very low line_10: mass and luminosity, but would also provide proof of the validity of a line_11: classical observational technique widely used in searches for other planetary line_12: systems. ! ! end of abstract general_form_proposers: lname: JEFFERYS fname: WILLIAM mi: H. inst: TEXAS, UNIVERSITY OF country: USA ! lname: BENEDICT fname: GEORGE mi: F. inst: TEXAS, UNIVERSITY OF country: USA ! lname: DUNCOMBE fname: RAYNOR mi: L. inst: TEXAS, UNIVERSITY OF country: USA ! lname: FRANZ fname: OTTO mi: G. inst: LOWELL OBSERVATORY country: USA ! lname: FREDRICK fname: LAURENCE mi: W. inst: VIRGINIA, UNIVERSITY OF country: USA ! lname: HEMENWAY fname: PAUL mi: D. inst: TEXAS, UNIVERSITY OF country: USA ! lname: SHELUS fname: PETER mi: J. inst: TEXAS, UNIVERSITY OF country: USA ! lname: VAN ALTENA fname: WILLIAM mi: F. inst: YALE UNIVERSITY country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: FGS will be used in the TRANS mode to obtain sets of multiple, line_2: continuous scans across targets thought to possess close, faint companions. line_4: Line 1 of the exposure logsheet defines sequences of scans with a scan-rate line_5: of 0.04 arcsec/sec and a scan-length of 1.2 arcsec per interferometer axis. ! question: 4 section: 1 line_1: While a few "unseen" companions of small Deltam and large separation associated line_2: with nearby stars have been found by ground-based imaging, the targets here line_3: proposed for observation will require the performance characteristics and the line_4: operating environment of ST to have a reasonable expectation of success. ! question: 5 section: 1 line_1: Special scheduling requirements, while neither very urgent nor very stringent, line_2: are made to enhance the probability of detection of "unseen" companions by line_3: adjusting observing intervals to expected orbital periods and thus the rate of line_4: orbital motions of suspected companions. ! ! question: 8 section: 1 line_1: Special plates will be obtained with the 1-meter Astrometric Reflector of the line_2: University of Virginia and will be made available as required. ! question: 10 section: 1 line_1: Existing computer facilities will be used at the investigator's home line_2: institutions, as will special software developed for analyses of these line_3: observations. ! question: 13 section: 1 line_1: Nearby red dwarf stars will be observed with FGS in the trans/moving mode in an line_2: attempt to detect "unseen" low-mass companions whose presence is indicated by line_3: analyses of perturbations found by long-focus photographic astrometry. ! !end of general form text general_form_address: lname: JEFFERYS fname: WILLIAM mi: H. category: PI inst: UNIVERSITY OF TEXAS addr_1: ASTRONOMY DEPARTMENT city: AUSTIN state: TX zip: 78712 country: USA phone: 512-471-4461 telex: TEXASTRO ! lname: FRANZ fname: OTTO mi: G. category: CON inst: LOWELL OBSERVATORY addr_1: 1400 W. MARS HILL RD city: FLAGSTAFF state: AZ zip: 86001 country: USA phone: 602-774-3358 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: BD+67D552 name_2: GLIESE310 descr_1: A,104 pos_1: RA=08H 36M 33.88S +/- 0.05S, pos_2: DEC=+67D 17' 40.2" +/- 0.5" equinox: 2000 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1954.90 ra_pm_val: -0.183000 ra_pm_unct: 0.000667 dec_pm_unct: 0.0100 an_prlx_val: 0.0780 an_prlx_unct: 0.0100 plate_req: Y plate_avail: N comment_1: (B-V) GIVEN FOR MOST TARGETS IN comment_2: ORIGINAL PROPOSAL fluxnum_1: 1 fluxval_1: V=9.30 ! targnum: 2 name_1: G146-72 descr_1: ^ pos_1: RA=10H 52M 14.23S +/- 0.1S, pos_2: DEC=+47D 30' 37.7" +/- 1" equinox: 1950 pm_or_par: ^ pos_epoch_bj: B pos_epoch_yr: 1953.20 ra_pm_val: -0.067000 ra_pm_unct: 0.000667 dec_pm_val: -0.1600 dec_pm_unct: 0.0100 an_prlx_val: 0.0300 an_prlx_unct: 0.0100 plate_req: Y plate_avail: N fluxnum_1: 1 fluxval_1: V=13 ! targnum: 3 name_1: AC+48D1595-89 name_2: GLIESE623 descr_1: ^ pos_1: RA=16H 24M 04.12S +/- 0.05S, pos_2: DEC=+48D 21' 31.7" +/- 0.5" equinox: 2000 pm_or_par: ^ pos_epoch_bj: B pos_epoch_yr: 1955.20 ra_pm_val: 0.116000 ra_pm_unct: 0.000667 dec_pm_val: -0.4600 dec_pm_unct: 0.0100 an_prlx_val: 0.1380 an_prlx_unct: 0.0100 plate_req: Y plate_avail: N fluxnum_1: 1 fluxval_1: V=10.27 ! targnum: 4 name_1: BD+68D946 descr_1: ^ pos_1: RA=17H 36M 28.55S +/- 0.05S, pos_2: DEC=+68D 21' 20.6" +/- 0.5" equinox: 2000 pm_or_par: ^ pos_epoch_bj: B pos_epoch_yr: 1953.40 ra_pm_val: -0.065000 ra_pm_unct: 0.000667 dec_pm_val: -1.2600 dec_pm_unct: 0.0100 an_prlx_val: 0.2130 an_prlx_unct: 0.0100 fluxnum_1: 1 fluxval_1: V=9.15 ! targnum: 5 name_1: W1062 name_2: GLIESE748 descr_1: ^ pos_1: RA=19H 12M 08.88S +/- 0.05S, pos_2: DEC=+02D 53' 35.9" +/- 0.5" equinox: 2000 pm_or_par: ^ pos_epoch_bj: B pos_epoch_yr: 1951.60 ra_pm_val: 0.118000 ra_pm_unct: 0.000667 dec_pm_val: -0.4500 dec_pm_unct: 0.0100 an_prlx_val: 0.0980 an_prlx_unct: 0.0100 plate_req: Y plate_avail: N fluxnum_1: 1 fluxval_1: V=11.2 ! targnum: 6 name_1: W922 name_2: GLIESE831 descr_1: A,104 pos_1: RA=21H 31M 14.90S +/- 0.05S, pos_2: DEC=-09D 47' 24.5" +/- 0.5" equinox: 2000 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1953.70 ra_pm_val: 0.079000 ra_pm_unct: 0.000667 dec_pm_val: -0.0600 dec_pm_unct: 0.0100 an_prlx_val: 0.1340 an_prlx_unct: 0.0100 plate_req: Y plate_avail: N fluxnum_1: 1 fluxval_1: V=11.95 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE sequence_2: C-SCN targname: # config: FGS opmode: TRANS aperture: 3 sp_element: F583W num_exp: # time_per_exp: 1200S s_to_n: 50 fluxnum_1: 1 priority: # param_1: DATA-RATE=32 param_2: STEP-SIZE=1.0 param_3: SCANS=40 param_4: ACQ-MODE=SEARCH req_1: POS TARG 0.0, 0.0; req_2: CYCLE 4 comment_1: FINE LOCK GUIDING comment_2: OFFSET KB=0.6 ARCSEC FROM COARSE TRACK comment_3: POSITION TO START OF SCAN ! linenum: 4.000 sequence_1: USE C-SCN targname: BD+67D552 num_exp: 1 priority: 1 req_1: REPEAT 4 EVERY 45D +/- 15D FOR 1 MORE req_2: TIMES; ! linenum: 5.000 sequence_1: USE C-SCN targname: G146-72 num_exp: ^ priority: 1 req_1: REPEAT 5 EVERY 45D +/- 15D FOR 2 MORE req_2: TIMES; ! linenum: 6.000 sequence_1: USE C-SCN targname: AC+48D1595-89 num_exp: ^ priority: 1 req_1: REPEAT 6 EVERY 45D +/- 15D FOR 2 MORE req_2: TIMES; ! linenum: 7.000 sequence_1: USE C-SCN targname: BD+68D946 num_exp: ^ priority: 1 req_1: REPEAT 7 EVERY 45D +/- 15D FOR 1 MORE req_2: TIMES; ! linenum: 8.000 sequence_1: USE C-SCN targname: W1062 num_exp: ^ priority: 1 req_1: REPEAT 8 EVERY 45D +/- 15D FOR 2 MORE req_2: TIMES; ! linenum: 9.000 sequence_1: USE C-SCN targname: W922 num_exp: ^ priority: 1 req_1: REPEAT 9 EVERY 45D +/- 15D FOR 2 MORE req_2: TIMES; ! ! end of exposure logsheet ! No scan data records found