! File: 4307C.PROP ! Database: PEPDB ! Date: 20-FEB-1994:21:10:47 coverpage: title_1: RADIAL AND NONRADIAL PULSATIONS IN HOT WHITE DWARFS title_2: -- CYCLE 3 MEDIUM sci_cat: HOT STARS sci_subcat: WHITE DWARFS proposal_for: GO pi_fname: STEVEN pi_mi: D. pi_lname: KAWALER pi_inst: IOWA STATE UNIVERSITY pi_country: USA hours_pri: 3.69 num_pri: 3 hsp: Y funds_length: 12 off_fname: RICHARD off_mi: E. off_lname: HASBROOK off_title: CONTR & GRANTS OFFCR off_inst: 2350 off_addr_1: 209 BEARDSHEAR off_city: AMES off_state: IA off_zip: 50011 off_country: USA off_phone: 515-294-5225 ! end of coverpage abstract: line_1: We propose to use the High Speed Photometer to search for the line_2: previously unobserved phenomenon of RADIAL pulsations in white line_3: dwarfs. Three classes of NONRADIALLY pulsating white dwarfs are line_4: known, with pulsation periods ranging from several minutes to half an line_5: hour. Theory predicts that stars slightly hotter than the nonradial line_6: instability strips for DA, DB, and PG 1159-type white dwarfs should line_7: be unstable to radial pulsations, with periods between 0.1 and 10 line_8: seconds. We have received Cycle 2 HSP time to search several DA and line_9: DB candidates for these predicted rapid pulsations. In Cycle 3 we line_10: propose to use HSP to search for the predicted radial pulsations in 3 line_11: members of the PG 1159 class. High-speed UV photometry is free from line_12: atmospheric scintillation, and takes advantage of the larger stellar line_13: fluxes and larger pulsation amplitudes for these extremely hot (above line_14: 125,000 K) stars. Our targets are three known nonradial pulsators line_15: (two are central stars in planetary nebulae), so that the observations line_16: will also provide information on the wavelength dependence of the line_17: nonradial pulsation amplitudes. The presence (or absence) of radial line_18: pulsations will provide significant new information for (or line_19: challenges to) our understanding of white-dwarf pulsations, line_20: structure, and evolution. ! ! end of abstract general_form_proposers: lname: KAWALER fname: STEVEN title: PI mi: D. inst: IOWA STATE UNIVERSITY country: USA ! lname: BOND fname: HOWARD mi: E. inst: STSCI country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: We will obtain high-speed photometry of hot DOZ white dwarfs at line_2: ultraviolet wavelengths with the HSP. We will use a time resolution line_3: of 0.02 sec. To maximize the count rates on these hot (140,000K) line_4: white dwarfs, we will use the F140LP filter configuration with one line_5: of the UV IDTs. We will observe through the 10" acquisition line_6: aperture to maximize the count rate. Run lengths will range line_7: from 30 to 135 minutes (uninterrupted). ! question: 5 section: 1 line_1: One of our targets, K1-16, lies within the CVZ. We will observe line_2: this star for 135 continuous minutes to improve the signal-to-noise line_3: and therefore improve the amplitude sensitivity for radial pulsations. line_4: This longer exposure time will also allow us to study the nonradial line_5: pulsations in this object by giving data over several cycles of the line_6: 1700 second dominant pulsation mode. ! !end of general form text general_form_address: lname: KAWALER fname: STEVEN mi: D. category: PI inst: Iowa State University addr_1: DEPARTMENT OF PHYSICS AND ASTRONOMY city: AMES state: IA zip: 50011 country: USA phone: 515-294-9728 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: PG1159-035 name_2: GW-VIRGINIS descr_1: A,175,176 pos_1: RA=12H01M45.98S +/- 0.33", pos_2: DEC=-03D45'40.7" +/- 0.33", pos_3: PLATE-ID=03O9 equinox: J2000 pm_or_par: N pos_epoch_yr: 1983.40 fluxnum_1: 1 fluxval_1: V=14.8,TYPE=PG1159 ! targnum: 2 name_1: K1-16 name_2: GSC4222-830 descr_1: A,184,175,176 pos_1: RA=18H21M52.02S +/- 0.33", pos_2: DEC=+64D21'53.9" +/- 0.33", pos_3: PLATE-ID=00T0 equinox: J2000 pm_or_par: N pos_epoch_bj: J pos_epoch_yr: 1983.40 fluxnum_1: 1 fluxval_1: V=15.1,TYPE=PG1159 fluxnum_2: 1 fluxval_2: B-V=-0.4 ! targnum: 3 name_1: RXJ2117+3412 descr_1: A,184,175,176 pos_1: RA=21H17M08.29S +/- 0.33", pos_2: DEC=+34D12'27.6" +/- 0.33", pos_3: PLATE-ID=01W5 equinox: J2000 pm_or_par: N pos_epoch_bj: B pos_epoch_yr: 1983.60 comment_1: ROSAT SOURCE fluxnum_1: 1 fluxval_1: V=13.2,TYPE=PG1159 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: PG1159-035 config: HSP/UV2 opmode: ACQ num_exp: 1 time_per_exp: 2.0M s_to_n: 12 fluxnum_1: 1 priority: 1 param_1: DATA-FORMAT=WORD req_1: ONBOARD ACQ FOR 2; req_2: PCS MODE F; req_3: CYCLE 3 ! linenum: 2.000 targname: PG1159-035 config: HSP/UV2 opmode: SINGLE aperture: 10.0 sp_element: F140LP num_exp: 1 time_per_exp: 30M fluxnum_1: 1 priority: 1 param_1: SAMPLE-TIME=0.02, param_2: PRECISION=HIGH req_1: NON-INT; req_2: PCS MODE F; req_3: CYCLE 3 ! linenum: 2.500 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 0S priority: 1 param_1: FORMAT=FN req_1: PAR WITH 2; req_2: CRIT OBS; req_3: CYCLE 3 comment_1: THE FN FORMAT IS SPECIFIED IN ORDER TO comment_2: ASSURE THAT THE ENGINEERING DATA ARE comment_3: RECORDED AT 32 KBPS, FOR SUBSEQUENT comment_4: ATTEMPTS TO REMOVE GUIDING JITTER FROM comment_5: THE HSP PHOTOMETRY ! linenum: 3.000 targname: K1-16 config: HSP/UV2 opmode: ACQ num_exp: 1 time_per_exp: 2.0M s_to_n: 12 fluxnum_1: 1 priority: 1 param_1: DATA-FORMAT=WORD req_1: ONBOARD ACQ FOR 4; req_2: PCS MODE F; req_3: CYCLE 3 ! linenum: 4.000 targname: K1-16 config: HSP/UV2 opmode: SINGLE aperture: 10.0 sp_element: F140LP num_exp: 1 time_per_exp: 135M fluxnum_1: 1 priority: 1 param_1: SAMPLE-TIME=0.05, param_2: PRECISION=HIGH req_1: NON-INT; req_2: PCS MODE F; req_3: CYCLE 3; comment_1: CONTINUOUS VIEWING ZONE (CVZ) TARGET ! linenum: 4.500 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 0S priority: 1 param_1: FORMAT=FN req_1: PAR WITH 4; req_2: CRIT OBS; req_3: CYCLE 3 comment_1: THE FN FORMAT IS SPECIFIED IN ORDER TO comment_2: ASSURE THAT THE ENGINEERING DATA ARE comment_3: RECORDED AT 32 KBPS, FOR SUBSEQUENT comment_4: ATTEMPTS TO REMOVE GUIDING JITTER FROM comment_5: THE HSP PHOTOMETRY ! linenum: 5.000 targname: RXJ2117+3412 config: HSP/UV2 opmode: ACQ num_exp: 1 time_per_exp: 1.0M s_to_n: 12 fluxnum_1: 1 priority: 1 param_1: DATA-FORMAT=WORD req_1: ONBOARD ACQ FOR 6-6.2; req_2: PCS MODE F; req_3: CYCLE 3 ! linenum: 6.000 targname: RXJ2117+3412 config: HSP/UV2 opmode: SINGLE aperture: 10.0 sp_element: F140LP num_exp: 1 time_per_exp: 34M fluxnum_1: 1 priority: 1 param_1: SAMPLE-TIME=0.02, param_2: PRECISION=HIGH req_1: NON-INT; req_2: PCS MODE F; req_3: CYCLE 3 ! linenum: 6.200 targname: RXJ2117+3412 config: HSP/UV2 opmode: SINGLE aperture: 10.0 sp_element: F140LP num_exp: 1 time_per_exp: 34M fluxnum_1: 1 priority: 1 param_1: SAMPLE-TIME=0.02, param_2: PRECISION=HIGH req_1: NON-INT; req_2: PCS MODE F; req_3: CYCLE 3 ! linenum: 6.300 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 0S priority: 1 param_1: FORMAT=FN req_1: PAR WITH 6; req_2: CRIT OBS; req_3: CYCLE 3 comment_1: THE FN FORMAT IS SPECIFIED IN ORDER TO comment_2: ASSURE THAT THE ENGINEERING DATA ARE comment_3: RECORDED AT 32 KBPS, FOR SUBSEQUENT comment_4: ATTEMPTS TO REMOVE GUIDING JITTER FROM comment_5: THE HSP PHOTOMETRY ! linenum: 6.400 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 0S priority: 1 param_1: FORMAT=FN req_1: PAR WITH 6.2; req_2: CRIT OBS; req_3: CYCLE 3 comment_1: THE FN FORMAT IS SPECIFIED IN ORDER TO comment_2: ASSURE THAT THE ENGINEERING DATA ARE comment_3: RECORDED AT 32 KBPS, FOR SUBSEQUENT comment_4: ATTEMPTS TO REMOVE GUIDING JITTER FROM comment_5: THE HSP PHOTOMETRY ! ! end of exposure logsheet ! No scan data records found