! File: 4593C.PROP ! Database: PEPDB ! Date: 22-FEB-1994:19:00:29 coverpage: title_1: POSITIONING OF THE GEMINGA OPTICAL COUNTERPART sci_cat: HOT STARS sci_subcat: NEUTRON STARS proposal_for: GO/DD pi_fname: GIOVANNI pi_mi: F. pi_lname: BIGNAMI pi_inst: CNR INSTITUTO DI FISICA COSMICA, MILANO pi_country: ITALY hours_pri: 1.39 num_pri: 1 wf_pc: Y off_fname: GIULIANO off_lname: BOELLA off_title: DIRECTOR off_inst: 6408 off_country: ITALY off_phone: 39-2-2363542 ! end of coverpage abstract: line_1: The status of our understanding of Geminga (1E0630+178) has recently line_2: much improved with the ROSAT/GRO discovery of a common periodicity line_3: in the X and gamma-ray source. The timing data require the object line_4: to be a rotating neutron star, at a distance very likely less than line_5: 100 pc. If so, a proper motion of the supposed optical counterpart line_6: (G") should be detectable with a PC exposure. This is all we need line_7: both for comparison with ground based images (taken as early as 1984), line_8: and as a reference for future HST data. This appears as the only line_9: feasible method of at last deciding on the optical counterpart of line_10: Geminga since if G" is indeed the counterpart it could have line_11: a detectable proper motion. ! ! end of abstract general_form_proposers: lname: BIGNAMI fname: GIOVANNI title: PI mi: F. inst: CNR INSTITUTO DI FISICA COSMICA, MILANO country: ITALY esa: Y ! lname: CARAVEO fname: PATRIZIA mi: A. inst: CNR INSTITUTO DI FISICA COSMICA, MILANO country: ITALY esa: Y ! lname: MEREGHETTI fname: SANDRO inst: CNR INSTITUTO DI FISICA COSMICA, MILANO country: ITALY esa: Y ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: a. Provide a short description of the proposed observations, by cycle if a line_2: long-term project. If this is an Archival Research proposal, provide a list line_3: of the number of exposures requested, or provide a generic description if line_4: appropriate. line_5: For the proposed scientifc objectives we need a PC8 image with a V filter. line_6: We simply want to image the Geminga field once to be able to position, line_7: with PC accuracy, the best available optical candidate, G". We have chosen line_8: the combination of the PC and V filter(F555W) because in this color we are sure line_9: of the object's magnitude and thus of its detectability in the requested time. ! question: 3 section: 1 line_1: Ground based astronomy has been exploited in full for Geminga. One exposure line_2: (split in 2 parts to allow cleaning for the CR hits) with the PC on HST, line_3: even with its reduced capability, will yield the one single crucial line_4: observation,i.e. the accurate subarcsec positioning of G", which could settle line_5: the optical side of the Geminga story. ! question: 4 section: 1 line_1: The observing time requested for this program has been kept to a minimum, in line_2: the spirit of the reassessment of our original proposal (ID2525), approved line_3: for cycle 1. In particular, we only need to be able to detect G" with the PC8 line_4: through the single V filter (F555W) and, following synphot, this can be obtained line_5: with S/N=10 in 2500 sec. In order to perform cosmic ray cleaning we request line_6: two 2500 sec exposures for a total of 5000 sec. ! question: 6 section: 1 line_1: The proposers have significant experience with ground based optical astronomy line_2: data analysis. line_3: At our Institute in Milano we have directly available IRAF (with STSDAS), MIDAS line_4: on SUN WS and VAX. line_5: We plan, however, to make full use of the ECF facility in Garching, and also line_6: to interact strongly with STScI Personnel. ! question: 8 section: 1 line_1: 2525 SEARCHING FOR THE GEMINGA OPTICAL COUNTERPART WITH MULTI COLOR PHOTOMETRY line_2: related line_3: 3432 CIR-X1 REVISITED: SPECTROSCOPY THROUGHOUT THE 16.6 DAY CYCLE OF THE REAL line_4: OPTICAL CANDIDATE line_5: not related line_6: b. Summarize the main results obtained from previous related programs. line_7: No results yet. ! question: 9 section: 1 line_1: The Istituto di Fisica Cosmica has VAX nad SUN WS equipped with MIDAS and IRAF line_2: (with STSDAS). Students from the Istituto di Fisica of the Milano University line_3: normally take active part in the data analysis. line_4: Funds will be provided by the Agenzia Spaziale Italian and by the CNR ! !end of general form text general_form_address: lname: BIGNAMI fname: GIOVANNI mi: F. title: PI category: PI inst: CNR Instituto di Fisica Cosmica, Milano country: ITALY phone: 39-2-2367587 telex: 313839 MUACNR ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: STAR-0633+1746 name_2: GEMINGA name_3: 1E0630+178 descr_1: A,160 pos_1: RA = 06H 33M 53.98S +/- 0.5", pos_2: DEC = 17D 46' 11.20" +/-0.5" equinox: J2000 comment_1: LINE 1 REFERES TO THE FAINTEST comment_2: OBJECT KNOWN IN THE FIELD. fluxnum_1: 1 fluxval_1: V= 25.3 +/- 0.2 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: STAR-0633+1746 config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 1400S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO req_2: SEQ 1-3 NO GAP; req_3: CYCLE 2 / 1-3 comment_1: EXPOSURE TIME HAS BEEN REDUCED BY comment_2: -20% TO FIT IN AN ALIGNMENT. ! linenum: 2.000 targname: STAR-0633+1746 config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 2000S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO comment_1: EXPOSURE TIME HAS BEEN REDUCED 20% comment_2: TO FIT IN AN ALIGNMENT. ! linenum: 3.000 targname: STAR-0633+1746 config: PC opmode: IMAGE aperture: PC6 sp_element: F555W num_exp: 1 time_per_exp: 2000S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO comment_1: EXPOSURE TIME HAS BEEN REDUCED 20% comment_2: TO FIT IN AN ALIGNMENT. ! ! end of exposure logsheet ! No scan data records found