! File: 2590C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:08:47:24 coverpage: title_1: DEEP IMAGING OF THE SITE OF SN 1961V, A POSSIBLE title_2: EXTRAGALACTIC ETA CARINAE ANALOGUE sci_cat: STELLAR ASTROPHYSICS sci_subcat: MASSIVE STARS proposal_for: GO pi_title: PROF. pi_fname: ALEXEI pi_mi: V. pi_lname: FILIPPENKO pi_inst: CALIFORNIA, UNIVERSITY OF, BERKELEY pi_country: USA pi_phone: 415-642-1813 keywords_1: EXT-STAR; SN; LBV; HOST=NGC1058 keywords_2: IMAGING hours_pri: 4.00 num_pri: 1 wf_pc: Y funds_amount: 80943 funds_length: 12 funds_date: JUL-91 pi_position: ASSOCIATE PROFESSOR off_fname: MARION off_lname: LENTZ off_title: RES. ADMINISTRATOR off_inst: UNIVERSITY OF CALIFORNIA off_addr_1: SPONSORED PROJECTS OFFICE off_addr_2: 5TH FLOOR BANWAY BUILDING off_addr_3: 2111 BANCROFT off_city: BERKELEY off_state: CA off_zip: 94720 off_country: USA off_phone: 415-642-8111 ! end of coverpage abstract: line_1: Analysis of new and old ground-based observations leads us line_2: to hypothesize that the unique "Type V Supernova" 1961V in line_3: NGC1058 was not a SN (the explosion of a massive star at line_4: the end of its life). Rather, it was the super-outburst of line_5: a luminous blue variable --- an exaggerated eta Car-type line_6: outburst of a very massive, evolved star near the end of line_7: core hydrogen burning. The long plateau in the light curve line_8: following outburst, at nearly the same brightness as the line_9: pre-outburst star, suggests that the progenitor survived line_10: the outburst; it later faded only because of the formation line_11: of optically thick dust in the ejecta. The underlying star line_12: should be a hot Of/WN star. Our observations suggest a line_13: circumstellar extinction of Av=5mag, if the surviving star line_14: resembles eta Car. The present brightness of the star line_15: should be near V=27, but perhaps as bright as V=23. We line_16: will determine whether the star is present by imaging the line_17: site of SN1961V with the WFC. The faint star cannot be line_18: seen from the ground because of contamination by the line_19: underlying HII regions. ! ! end of abstract general_form_proposers: lname: FILIPPENKO fname: ALEXEI title: PROF. mi: V. inst: CALIFORNIA, UNIVERSITY OF, BERKELEY country: USA ! lname: GOODRICH fname: ROBERT mi: W. inst: CALIFORNIA INSTITUTE OF TECHNOLOGY country: USA ! lname: STRINGFELLOW fname: GUY mi: S. inst: MOUNT STROMLO OBSERVATORY country: AUSTRALIA ! lname: PORTER fname: ALAIN mi: C. inst: KPNO, NOAO country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: We will obtain WFC images of the site of SN 1961V through line_2: wide-band filters (corresponding to V, R, and I), line_3: to attempt to locate the star which we believe produced line_4: the SN 1961V outburst. If our hypothesis is correct, the line_5: star should still exist; it was not a true supernova. line_6: The object may, however, be severely reddened; hence, line_7: exposures at several different wavelengths are desired. line_8: These exposures should help in the identification of the line_9: star, if several candidates are visible in a small region, line_10: since we will have color information. The wide-band line_11: filters we have chosen are F555W, F702W, and F785LP. line_12: This combination maximizes the wavelength range over line_13: which observations will be made. CR-split will be used, line_14: and we will not pre-flash the exposures. The chosen set line_15: of wide-band filters differs in detail from the one line_16: originally proposed, because the original WFPC handbook line_17: did not make it clear which filters correspond most line_18: closely with the Johnson filters. ! !end of general form text general_form_address: lname: FILIPPENKO fname: ALEXEI mi: V. title: PROF. category: PI inst: UNIVERSITY OF CALIFORNIA addr_1: DEPARTMENT OF ASTRONOMY city: BERKELEY state: CA zip: 94720 country: USA phone: 415-642-1813 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: SN1961V descr_1: EXT-STAR; SN; LBV; HOST=NGC1058 pos_1: RA = 2H 40M 29.70S +/- 4", pos_2: DEC = +37D 8' 1.6" +/- 4", pos_3: REGION equinox: 1950.0 rv_or_z: Z = 0.0017 comment_1: STELLAR OBJECT AT SITE OF SN1961V comment_2: HAS NEVER BEEN DETECTED; WE ARE comment_3: TESTING A THEORETICAL PREDICTION. comment_4: THUS MAGNITUDE AND COLOR ESTIMATES comment_5: ARE HIGHLY UNCERTAIN. IF SUITABLE comment_6: GUIDE STARS NOT FOUND, CAN POINT comment_7: HST UP TO 30" FROM ABOVE POSITION. comment_8: IN WORST CASE, CENTER IN W2,3, OR 4 comment_9: INSTEAD OF W1. fluxnum_1: 1 fluxval_1: V = 26.0 +/- 1.0 fluxnum_2: 2 fluxval_2: B-V = 0.3 +/- 1.0 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: SN1961V config: WFC opmode: IMAGE aperture: W1 sp_element: F702W num_exp: 1 time_per_exp: 1500S s_to_n: 6 fluxnum_1: 1 fluxnum_2: 2 priority: 1 param_1: PRE-FLASH=NO, param_2: CR-SPLIT=NO req_1: CYCLE 1; req_2: SEQ 1-3 NO GAP comment_1: IF THERE IS EXTRA TIME BEFORE EARTH comment_2: OCCULTATION, IT CAN BE ADDED TO comment_3: THE EXPOSURE TIME TO INCREASE S/N. comment_4: QUOTED S/N IS SUM OF TWO 30M EXP. comment_5: WANT DATA FROM ALL 4 CCDS. ! linenum: 1.500 targname: SN1961V config: WFC opmode: IMAGE aperture: W1 sp_element: F702W num_exp: 1 time_per_exp: 40M s_to_n: 6 fluxnum_1: 1 fluxnum_2: 2 priority: 1 param_1: PRE-FLASH=NO, param_2: CR-SPLIT=NO req_1: CYCLE 1 comment_1: IF THERE IS EXTRA TIME BEFORE EARTH comment_2: OCCULTATION, IT CAN BE ADDED TO comment_3: THE EXPOSURE TIME TO INCREASE S/N. comment_4: QUOTED S/N IS SUM OF TWO 30M EXP. comment_5: WANT DATA FROM ALL 4 CCDS. ! linenum: 2.000 targname: SN1961V config: WFC opmode: IMAGE aperture: W1 sp_element: F785LP num_exp: 3 time_per_exp: 40M s_to_n: 4 fluxnum_1: 1 fluxnum_2: 2 priority: 2 param_1: PRE-FLASH=NO, param_2: CR-SPLIT=NO req_1: CYCLE 1 comment_1: IF THERE IS EXTRA TIME BEFORE EARTH comment_2: OCCULTATION, IT CAN BE ADDED TO comment_3: THE EXPOSURE TIME TO INCREASE S/N. comment_4: QUOTED S/N IS SUM OF TWO 47.5M EXP. comment_5: WANT DATA FROM ALL 4 CCDS. ! linenum: 3.000 targname: SN1961V config: WFC opmode: IMAGE aperture: W1 sp_element: F555W num_exp: 2 time_per_exp: 40M s_to_n: 6 fluxnum_1: 1 fluxnum_2: 2 priority: 3 param_1: PRE-FLASH=NO, param_2: CR-SPLIT=NO req_1: CYCLE 1 comment_1: IF THERE IS EXTRA TIME BEFORE EARTH comment_2: OCCULTATION, IT CAN BE ADDED TO comment_3: THE EXPOSURE TIME TO INCREASE S/N. comment_4: QUOTED S/N IS SUM OF TWO 30-M EXP. comment_5: WANT DATA FROM ALL 4 CCDS. ! ! end of exposure logsheet ! No scan data records found