! File: 1020C.PROP ! Database: PEPDB ! Date: 15-FEB-1994:22:43:30 coverpage: title_1: FAINT STARS AND GALAXIES IN SA 57 AND SA 68: title_2: FUTURE-CYCLE CONTINUATION sci_cat: STELLAR POPULATIONS proposal_for: GTO/OS pi_title: DR. pi_fname: JOHN pi_mi: N. pi_lname: BAHCALL pi_inst: INSTITUTE FOR ADVANCED STUDY pi_country: USA pi_phone: (609) 734-8054 keywords_1: STAR COUNTS; STRUCTURE OF THE GALAXY; DEEP GALAXY keywords_2: COUNTS; GALAXY HALO hours_pri: 1.50 num_pri: 2 wf_pc: X foc: X pi_position: DR. JOHN N. BAHCALL off_fname: ALLEN off_lname: ROWE off_title: ASSOC DIR ADM/FIN off_addr_1: INSTITUTE FOR ADVANCED STUDY off_addr_2: OLDEN LANE off_city: PRINCETON off_state: NJ off_zip: 08540 off_country: USA off_phone: (609) 734-8205 off_telex: 837680 ! end of coverpage abstract: line_1: Two selected area fields, one in SA 57 and one in SA 68, line_2: that have guide stars accessible for any telescope roll line_3: angle are proposed for study with deep WFC exposures. The line_4: results will compared with surveys of the same fields in line_5: x-ray, optical (from the ground), infrared, and radio line_6: wavelengths. The star counts will be used together with the line_7: Bahcall and Soneira Galaxy model to determine if the massive line_8: halo of the Galaxy is composed of stars that burn hydrogen. line_9: ST observations are required to discriminate between stars line_10: and galaxies at the faint magnitudes of interest. ! ! end of abstract general_form_proposers: lname: KRON fname: RICHARD mi: G. inst: CHICAGO, UNIVERSITY OF country: USA ! lname: BAHCALL fname: JOHN mi: N. inst: INSTITUTE FOR ADVANCED STUDY country: USA ! lname: KOO fname: DAVID mi: C. inst: SPACE TELESCOPE SCIENCE INSTITUTE country: USA ! lname: SCHNEIDER fname: DONALD inst: INSTITUTE FOR ADVANCED STUDY country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: Depending upon when HST launch occurs, we want the STScI line_2: Operations Branch to schedule one of the fields, either line_3: SA 57-1 or SA 68-1, for study during the Science line_4: Verification phase. The operations branch can decide which line_5: field is preferable based upon scheduling requirements, line_6: taking into account our need for dark time. If scheduling line_7: considerations are not decisive, use SA 57-1 as the program line_8: field. Two WFC exposures will be taken, one with F555W and line_9: one with F785LP, for the program field, SA 57-1 or SA 68-1. line_10: Dark time is required to reach the faint limiting magnitudes line_11: of interest. Since we want to measure colors for each of the line_12: objects in our program field, we would like to have the roll line_13: angle the same for both exposures. Parallel observations line_14: with the FOC/48 are requested to permit study of additional line_15: objects in the program field. Do SA 57-1 exposures in line_16: Cycle 1(SV) if it is accessible in the six months following line_17: ST launch. If not, do SA 68-1 exposures in Cycle 1(SV). ! question: 4 section: 1 line_1: St observations are required in order to reach the faintest line_2: limiting magnitudes and to discriminate between stars and line_3: galaxies. ! question: 5 section: 1 line_1: Do the exposures for one of the fields during cycle 1(SV). line_2: The field positions have been chosen so that both fields line_3: have pe roll angle. The telescope roll angle should be the line_4: same for both exposures. The STScI operations branch can line_5: decide which field is preferable based upon scheduling line_6: requirements, taking into account our need for dark time. If line_7: scheduling considerations are not decisive, use SA 57-1 as line_8: the program field. ! question: 6 section: 1 line_1: Dark time is required to reach the faintest limiting line_2: magnitudes. We want a default cosmic ray exposure for each line_3: filter. We do not want other interruptions since the readout line_4: noise from additional exposures would decrease our limiting line_5: magnitude. ! question: 7 section: 1 line_1: Data reduction and analysis will be performed at IAS, using line_2: the WFC image processing system developed by D. Schneider, line_3: and at STScI and the University of Chicago. ! question: 8 section: 1 line_1: Survey results in other wavelength regions will be analyzed line_2: prior to ST launch and additional ground-based observations line_3: will be taken as required. The predictions of the Bahcall line_4: and Soneira Galaxy model will be computed for F555W and line_5: F785LP, with and without a massive hydrogen-burning halo, line_6: for differentassumed explorations of the spheroid luminosity line_7: function. ! question: 10 section: 1 line_1: Support for data analysis, research assistance, and line_2: computing facilities will be supplied jointly by IAS, STScI, line_3: and the University of Chicago. ! question: 12 section: 1 line_1: Two candidate primary fields are listed, SA 57-1 and line_2: SA 68-1. Only one of these two fields will be studied line_3: during the Science Verification phase. The operations branch line_4: of the STScI should decide which field better fits the line_5: schedule for science verification, depending upon the launch line_6: date of HST and the other science programs. If scheduling line_7: considerations are not decisive, use SA 57-1 as the program line_8: field. ! question: 13 section: 1 line_1: Two selected area fields, one in SA 57 and one in SA 68, line_2: that have guide stars accessible for any telescope roll line_3: angle are proposed for study with deep WFC exposures. line_4: Parallel observations with the FOC/48 will be obtained. The line_5: results will be compared with surveys of the same fields in line_6: x-ray, optical(from the ground), infrared, and radio line_7: wavelengths. The star counts will be used together with the line_8: Bahcall and Soneira Galaxy model to determine if the massive line_9: halo of the Galaxy is composed of stars that burn hydrogen. line_10: Galaxy counts will determine if the simulated ST picture line_11: which has about 10E+2.5 galaxies (Bahcall 1985, IAU line_12: Symposium 113), based upon a conventional model of galaxy line_13: evolution, is a reasonable approximation. ! !end of general form text general_form_address: lname: BAHCALL fname: JOHN mi: N. title: DR. category: PI inst: INSTITUTE FOR ADVANCED STUDY addr_1: OLDEN LANE city: PRINCETON state: NJ zip: 08540 country: USA phone: (609) 734-8054 telex: 837680 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: SA57-1 descr_1: SURVEY FIELD IN SA57 pos_1: RA = 13H 06M 52.22S +/- 0.1S, pos_2: DEC = +29D 28' 19.2" +/- 1" equinox: 1950 pm_or_par: NO comment_1: ONLY ONE OF THESE TARGETS WILL BE comment_2: STUDIED. ! targnum: 2 name_1: SA68-1 descr_1: SURVEY FIELD IN SA68 pos_1: RA = 00H 15M 44.00S +/- 0.1S, pos_2: DEC = +15D 45' 45.0" +/- 1" equinox: ^ pm_or_par: ^ ! ! end of fixed targets ! No solar system records found generic_targets: targnum_1: 5 targnum_2: 8 name_1: BG-OBJECTS descr_1: PARALLEL (RANDOM) FIELDS TO BE STUDIED OFF descr_2: SET 6.6' FROM SA57-1 AND SA68-1 criteria_1: RANDOM FIELDS ACCESSIBLE WHEN WFC IS criteria_2: STUDYING SA57-1 AND SA68-1 comment_1: WE WILL CHECK PARALLEL FIELDS ONCE comment_2: SCHEDULING SPECIFIES ROLL ANGLE. ! ! end of generic targets exposure_logsheet: linenum: 1.000 targname: SA57-1 config: WFC opmode: IMAGE aperture: ALL sp_element: F555W num_exp: 1 time_per_exp: 540S priority: 2 param_1: PRE-FLASH=YES, param_2: CR-SPLIT=NO req_1: DARK TIME / 1-2.1,5-6.1 ; req_2: CYCLE 4 / 1-6.1; req_3: NON-INT / 1-2.1,5-6.1 comment_1: ONLY ONE OF THE TARGETS, SA57-1 OR comment_2: SA68-1, WILL BE STUDIED. ! linenum: 1.100 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 2160S priority: ^ param_1: PRE-FLASH=NO , param_2: CR-SPLIT=NO req_1: SEQ 1-1.1 NO GAP ! linenum: 2.000 targname: SA57-1 config: WFC opmode: IMAGE aperture: ALL sp_element: F785LP num_exp: 1 time_per_exp: 540S priority: 2 param_1: PRE-FLASH=YES, param_2: CR-SPLIT=NO req_1: SAME ORIENT FOR 2 AS 1 ; req_2: SEQ 2-2.1 NO GAP ! linenum: 2.100 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 2160S priority: ^ param_1: PRE-FLASH=NO , param_2: CR-SPLIT=NO ! linenum: 5.000 targname: SA68-1 config: WFC opmode: IMAGE aperture: ALL sp_element: F555W num_exp: 1 time_per_exp: 540S priority: 2 param_1: PRE-FLASH=YES, param_2: CR-SPLIT=NO req_1: SELECT 1 OF 1-2.1 OR 5-6.1; req_2: CONDITIONAL IF LAUNCH DATE ! linenum: 5.100 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 2160S priority: ^ param_1: PRE-FLASH=NO , param_2: CR-SPLIT=NO req_1: SEQ 5-5.1 NO GAP ; req_2: CONDITIONAL IF LAUNCH DATE ! linenum: 6.000 targname: SA68-1 config: WFC opmode: IMAGE aperture: ALL sp_element: F785LP num_exp: 1 time_per_exp: 540S priority: 2 param_1: PRE-FLASH=YES, param_2: CR-SPLIT=NO req_1: SAME ORIENT FOR 6 AS 5 ; req_2: CONDITIONAL IF LAUNCH DATE ! linenum: 6.100 targname: SA68-1 config: WFC opmode: IMAGE aperture: ALL sp_element: F785LP num_exp: 1 time_per_exp: 2160S priority: 2 param_1: PRE-FLASH=NO , param_2: CR-SPLIT=NO req_1: SEQ 6-6.1 NO GAP ; req_2: CONDITIONAL IF LAUNCH DATE ! ! end of exposure logsheet ! No scan data records found