! $Id: 5459,v 11.1 1994/11/22 14:27:22 pepsa Exp $ coverpage: title_1: ULTRAVIOLET INTERSTELLAR POLARIZATION CYCLE 4 HIGH sci_cat: INTERSTELLAR MEDIUM sci_subcat: DUST proposal_for: GO longterm: 1 pi_fname: WILLIAM pi_lname: SOMERVILLE pi_inst: 8090 pi_country: UK pi_phone: 071-387-7050 X 3477 hours_pri: 6.24 num_pri: 6 fos: Y funds_amount: 60000 funds_length: 12 ! end of coverpage abstract: line_1: Spectropolarimetric observations in the ultraviolet give unique information line_2: relevant to the size and shape distributions, the chemical composition and line_3: alignment properties of the interstellar dust grains, and the carrier of the line_4: strong absorption feature at 2175A. This work addresses four principal line_5: observational questions: does the empirical polarization curve (Serkowski's line_6: Law) extend into the UV\?; does the 2175A feature show polarization\?; does line_7: polarization reflect the strong rise in extinction found in the far-UV\?; are line_8: these results different in different directions, and if so how do they relate line_9: to other properties of the dust grains\? Targets are selected to have a line_10: variety of ultravolet extinction and optical polarization properties. line_11: We have observed three stars in Cycle 1, and have been awarded time in Cycle 3 line_12: to observe two more, through the full UV range. The recent WUPPE results show line_13: that UV polarization can depend on direction, so we propose to increase the line_14: number of sightlines studied. With the grating G270H, it will be possible to line_15: look for polarization in the profile of the 2175A feature, and departures from line_16: the Serkowski curve should also be clearly seen. The most important result line_17: from our HST work is that none of the three stars studied shows any trace of line_18: polarization associated with the 2175A feature, with very good-quality data. line_19: This casts doubt on the excess found by WUPPE in one star only, which it is line_20: essential to reobserve with HST and is included in the present target list. ! ! end of abstract general_form_proposers: lname: SOMERVILLE fname: WILLIAM inst: 8090 country: UK esa: Y ! lname: WILSON fname: SIR ROBERT inst: 8090 country: UK esa: Y ! lname: CARNOCHAN fname: DAVID inst: 8090 country: UK esa: Y ! lname: MCNALLY fname: DEREK inst: 8090 country: UK esa: Y ! lname: NANDY fname: KASHI inst: 8074 country: UK esa: Y ! lname: MORGAN fname: DAVID inst: 8074 country: UK esa: Y ! lname: WHITTET fname: DOUGLAS inst: 3220 country: USA ! lname: MARTIN fname: PETER inst: 4664 country: CANADA ! lname: KIM fname: SANG-HEE inst: 4664 country: CANADA ! lname: WALSH fname: JEREMY inst: 5555 country: GERMANY esa: Y ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: Each target requires observations with the Faint Object Spectrograph, using line_2: the Blue Digicon and Waveplate B with the grating G270H. This will cover line_3: the wavelength range 2222-3300\AA. The 1.0arcsec circular aperture will be line_4: used, and exposure times calculated to give the highest signal-to-noise that line_5: is consistent with the expected accuracy of calibration. All the targets are line_6: bright, isolated stars. The acquisition sequence will centre the target in line_7: the aperture to 0.2 arcsec, to give accurate polarimetry and spectral line_8: calibration. Eight position angles will be used, for accurate calibration of line_9: the linear polarization and to obtain at least an upper limit on the circular line_10: polarization. ! !end of general form text general_form_address: lname: SOMERVILLE fname: WILLIAM category: PI inst: 8090 addr_1: DEPARTMENT OF PHYSICS AND ASTRONOMY, addr_2: UNIVERSITY COLLEGE LONDON, addr_3: GOWER STREET, city: LONDON WC1E 6BT country: UK phone: 071-387-7050 X 3477 telex: 28722; SPAN: 19752::WBS ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: HD22253 name_2: GSC5833-00452 descr_1: A,113,G,508 pos_1: RA= 3H 37M 44.12S +/- 0.5", pos_2: DEC = +56D 44' 21.8" +/- 0.5", pos_3: PLATE-ID=01W1 equinox: 2000 pm_or_par: N comment_1: GSC COORDINATES comment_2: UV FLUXES FROM S2/68 comment_3: ANOMALOUS UV EXTINCTION fluxnum_1: 1 fluxval_1: V = 6.53 +/- 0.05, B-V = 0.34 +/- 0.05 fluxnum_2: 2 fluxval_2: TYPE=B0.5 III, E(B-V) = 0.61 +/- 0.05 fluxnum_3: 3 fluxval_3: F-CONT (2500) = 9.92 +/- 0.67 E-12 ! targnum: 2 name_1: HD36629 name_2: GSC4774-00924 descr_1: A,110,G,508 pos_1: RA= 05H 32M 57.09S +/- 0.5", pos_2: DEC = -04D 33' 59.1" +/- 0.5", pos_3: PLATE-ID=02NB equinox: 2000 pm_or_par: N comment_1: GSC COORDINATES comment_2: UV FLUXES FROM S2/68 comment_3: ANOMALOUS UV EXTINCTION fluxnum_1: 1 fluxval_1: V = 7.65 +/- 0.05, B-V = 0.02 +/- 0.05 fluxnum_2: 2 fluxval_2: TYPE=B2 V, E(B-V) = 0.27 +/- 0.05 fluxnum_3: 3 fluxval_3: F-CONT (2500) = 11.38 +/- 0.47 E-12 ! targnum: 3 name_1: HD38087 name_2: GSC4771-01146 descr_1: A,111,G,508 pos_1: RA= 05H 43M 00.48S +/- 0.5", pos_2: DEC = -02D 18' 46.2" +/- 0.5", pos_3: PLATE-ID=0084 equinox: 2000 pm_or_par: N comment_1: GSC COORDINATES comment_2: UV FLUXES FROM S2/68 comment_3: ANOMALOUS UV EXTINCTION fluxnum_1: 1 fluxval_1: V = 8.30 +/- 0.05, B-V = 0.13 +/- 0.05 fluxnum_2: 2 fluxval_2: TYPE=B5 V, E(B-V) = 0.35 +/- 0.05 fluxnum_3: 3 fluxval_3: F-CONT (2500) = 4.41 +/- 0.27 E-12 ! targnum: 4 name_1: HD161961 name_2: GSC5086-00310 descr_1: A,113,G,508 pos_1: RA= 17H 48M 36.84S +/- 0.5", pos_2: DEC = -02D 11' 45.9" +/- 0.5", pos_3: PLATE-ID=00JP equinox: 2000 pm_or_par: N comment_1: GSC COORDINATES comment_2: UV FLUXES FROM S2/68 comment_3: ANOMALOUS UV EXTINCTION fluxnum_1: 1 fluxval_1: V = 7.89 +/- 0.05, B-V = 0.23 +/- 0.05 fluxnum_2: 2 fluxval_2: TYPE=B0.5 III, E(B-V) = 0.51 +/- 0.05 fluxnum_3: 3 fluxval_3: F-CONT (2500) = 5.79 +/- 0.34 E-12 ! targnum: 5 name_1: HD197770 name_2: GSC3959-01686 descr_1: A,113,G,508 pos_1: RA= 20H 43M 13.61S +/- 0.5", pos_2: DEC = +57D 06' 50.1" +/- 0.5", pos_3: PLATE-ID=003M equinox: 2000 pm_or_par: N comment_1: GSC COORDINATES comment_2: UV FLUXES FROM S2/68 comment_3: ANOMALOUS UV EXTINCTION fluxnum_1: 1 fluxval_1: V = 6.32 +/- 0.05, B-V = 0.33 +/- 0.05 fluxnum_2: 2 fluxval_2: TYPE=B2 III, E(B-V) = 0.56 +/- 0.05 fluxnum_3: 3 fluxval_3: F-CONT (2500) = 9.91 +/- 0.45 E-12 ! targnum: 6 name_1: HD207538 name_2: GSC3980-01047 descr_1: A,110,G,508 pos_1: RA= 21H 47M 39.78S +/- 0.5", pos_2: DEC = +59D 42' 01.3" +/- 0.5", pos_3: PLATE-ID=02X2 equinox: 2000 pm_or_par: N comment_1: GSC COORDINATES comment_2: UV FLUXES FROM S2/68 comment_3: ANOMALOUS UV EXTINCTION fluxnum_1: 1 fluxval_1: V = 7.29 +/- 0.05, B-V = 0.32 +/- 0.05 fluxnum_2: 2 fluxval_2: TYPE=B0 V, E(B-V) = 0.62 +/- 0.05 fluxnum_3: 3 fluxval_3: F-CONT (2500) = 5.81 +/- 0.39 E-12 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: HD22253 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: G570H num_exp: 1 time_per_exp: 0.8S param_1: TYPE=UP param_2: SEARCH-SIZE-X=1 param_3: SEARCH-SIZE-Y=3 param_4: SCAN-STEP-Y=1.204 req_1: ONBOARD ACQ FOR 2; req_2: CYCLE 4 / 1-24; req_3: COND IF FOS POLARIMETRY POSSIBLE req_4: WITH COSTAR / 1-24 comment_1: COUNT RATE AT 4600 = 3200 ! linenum: 2.000 targname: HD22253 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: G570H num_exp: 1 time_per_exp: 1.4S param_1: TYPE=UP param_2: SEARCH-SIZE-X=6 param_3: SEARCH-SIZE-Y=2 param_4: SCAN-STEP-X=0.602 param_5: SCAN-STEP-Y=0.602 req_1: ONBOARD ACQ FOR 3 comment_1: COUNT RATE AT 4600 = 2050 ! linenum: 3.000 targname: HD22253 config: FOS/BL opmode: ACQ/PEAK aperture: 0.3 sp_element: G570H num_exp: 1 time_per_exp: 4.0S param_1: TYPE=UP param_2: SEARCH-SIZE-X=5 param_3: SEARCH-SIZE-Y=5 param_4: SCAN-STEP-X=0.17 param_5: SCAN-STEP-Y=0.17 req_1: ONBOARD ACQ FOR 4 comment_1: COUNT RATE AT 4600 = 1300 ! linenum: 4.000 targname: HD22253 config: FOS/BL opmode: ACCUM aperture: 1.0 sp_element: G270H num_exp: 1 time_per_exp: 44.0M s_to_n: 1440 fluxnum_1: 3 priority: 1 param_1: POLSCAN=8B comment_1: POLARIZATION ERROR 0.1% IN 2 A AT comment_2: 2500 A REQUIRES 127000 COUNTS IN 1 comment_3: PIXEL RESULTING IN STATED S/N PER comment_4: PIXEL IN SUM OF ALL 16 SPECTRA. ! linenum: 5.000 targname: HD36629 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: G570H num_exp: 1 time_per_exp: 1.6S param_1: TYPE=UP param_2: SEARCH-SIZE-X=1 param_3: SEARCH-SIZE-Y=3 param_4: SCAN-STEP-Y=1.204 req_1: ONBOARD ACQ FOR 6; comment_1: COUNT RATE AT 4600 = 1650 ! linenum: 6.000 targname: HD36629 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: G570H num_exp: 1 time_per_exp: 2.7S param_1: TYPE=UP param_2: SEARCH-SIZE-X=6 param_3: SEARCH-SIZE-Y=2 param_4: SCAN-STEP-X=0.602 param_5: SCAN-STEP-Y=0.602 req_1: ONBOARD ACQ FOR 7 comment_1: COUNT RATE AT 4600 = 1060 ! linenum: 7.000 targname: HD36629 config: FOS/BL opmode: ACQ/PEAK aperture: 0.3 sp_element: G570H num_exp: 1 time_per_exp: 8.0S param_1: TYPE=UP param_2: SEARCH-SIZE-X=5 param_3: SEARCH-SIZE-Y=5 param_4: SCAN-STEP-X=0.17 param_5: SCAN-STEP-Y=0.17 req_1: ONBOARD ACQ FOR 8 comment_1: COUNT RATE AT 4600 = 680 ! linenum: 8.000 targname: HD36629 config: FOS/BL opmode: ACCUM aperture: 1.0 sp_element: G270H num_exp: 1 time_per_exp: 36.0M s_to_n: 1440 fluxnum_1: 3 priority: 1 param_1: POLSCAN=8B comment_1: POLARIZATION ERROR 0.1% IN 2 A AT comment_2: 2500 A REQUIRES 127000 COUNTS IN 1 comment_3: PIXEL RESULTING IN STATED S/N PER comment_4: PIXEL IN SUM OF ALL 16 SPECTRA. ! linenum: 9.000 targname: HD38087 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: G570H num_exp: 1 time_per_exp: 2.1S param_1: TYPE=UP param_2: SEARCH-SIZE-X=1 param_3: SEARCH-SIZE-Y=3 param_4: SCAN-STEP-Y=1.204 req_1: ONBOARD ACQ FOR 10 comment_1: COUNT RATE AT 4600 = 1250 ! linenum: 10.000 targname: HD38087 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: G570H num_exp: 1 time_per_exp: 3.6S param_1: TYPE=UP param_2: SEARCH-SIZE-X=6 param_3: SEARCH-SIZE-Y=2 param_4: SCAN-STEP-X=0.602 param_5: SCAN-STEP-Y=0.602 req_1: ONBOARD ACQ FOR 11 comment_1: COUNT RATE AT 4600 = 800 ! linenum: 11.000 targname: HD38087 config: FOS/BL opmode: ACQ/PEAK aperture: 0.3 sp_element: G570H num_exp: 1 time_per_exp: 11.0S param_1: TYPE=UP param_2: SEARCH-SIZE-X=5 param_3: SEARCH-SIZE-Y=5 param_4: SCAN-STEP-X=0.17 param_5: SCAN-STEP-Y=0.17 req_1: ONBOARD ACQ FOR 12 comment_1: COUNT RATE AT 4600 = 510 ! linenum: 12.000 targname: HD38087 config: FOS/BL opmode: ACCUM aperture: 1.0 sp_element: G270H num_exp: 3 time_per_exp: 29.0M s_to_n: 1440 fluxnum_1: 3 priority: 1 param_1: POLSCAN=8B comment_1: POLARIZATION ERROR 0.1% IN 2 A AT comment_2: 2500 A REQUIRES 127000 COUNTS IN 1 comment_3: PIXEL RESULTING IN STATED S/N PER comment_4: PIXEL IN SUM OF ALL 16 SPECTRA. ! linenum: 13.000 targname: HD161961 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: G570H num_exp: 1 time_per_exp: 2.3S param_1: TYPE=UP param_2: SEARCH-SIZE-X=1 param_3: SEARCH-SIZE-Y=3 param_4: SCAN-STEP-Y=1.204 req_1: ONBOARD ACQ FOR 14 comment_1: COUNT RATE AT 4600 = 1150 ! linenum: 14.000 targname: HD161961 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: G570H num_exp: 1 time_per_exp: 3.9S param_1: TYPE=UP param_2: SEARCH-SIZE-X=6 param_3: SEARCH-SIZE-Y=2 param_4: SCAN-STEP-X=0.602 param_5: SCAN-STEP-Y=0.602 req_1: ONBOARD ACQ FOR 15 comment_1: COUNT RATE AT 4600 = 740 ! linenum: 15.000 targname: HD161961 config: FOS/BL opmode: ACQ/PEAK aperture: 0.3 sp_element: G570H num_exp: 1 time_per_exp: 12.0S param_1: TYPE=UP param_2: SEARCH-SIZE-X=5 param_3: SEARCH-SIZE-Y=5 param_4: SCAN-STEP-X=0.17 param_5: SCAN-STEP-Y=0.17 req_1: ONBOARD ACQ FOR 16 comment_1: COUNT RATE AT 4600 = 470 ! linenum: 16.000 targname: HD161961 config: FOS/BL opmode: ACCUM aperture: 1.0 sp_element: G270H num_exp: 3 time_per_exp: 31.5M s_to_n: 1440 fluxnum_1: 3 priority: 1 param_1: POLSCAN=8B comment_1: POLARIZATION ERROR 0.1% IN 2 A AT comment_2: 2500 A REQUIRES 127000 COUNTS IN 1 comment_3: PIXEL RESULTING IN STATED S/N PER comment_4: PIXEL IN SUM OF ALL 16 SPECTRA. ! linenum: 17.000 targname: HD197770 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: G570H num_exp: 1 time_per_exp: 0.8S param_1: TYPE=UP param_2: SEARCH-SIZE-X=1 param_3: SEARCH-SIZE-Y=3 param_4: SCAN-STEP-Y=1.204 req_1: ONBOARD ACQ FOR 18 comment_1: COUNT RATE AT 4600 = 3400 ! linenum: 18.000 targname: HD197770 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: G570H num_exp: 1 time_per_exp: 1.3S param_1: TYPE=UP param_2: SEARCH-SIZE-X=6 param_3: SEARCH-SIZE-Y=2 param_4: SCAN-STEP-X=0.602 param_5: SCAN-STEP-Y=0.602 req_1: ONBOARD ACQ FOR 19 comment_1: COUNT RATE AT 4600 = 2180 ! linenum: 19.000 targname: HD197770 config: FOS/BL opmode: ACQ/PEAK aperture: 0.3 sp_element: G570H num_exp: 1 time_per_exp: 4.0S param_1: TYPE=UP param_2: SEARCH-SIZE-X=5 param_3: SEARCH-SIZE-Y=5 param_4: SCAN-STEP-X=0.17 param_5: SCAN-STEP-Y=0.17 req_1: ONBOARD ACQ FOR 20 comment_1: COUNT RATE AT 4600 = 1390 ! linenum: 20.000 targname: HD197770 config: FOS/BL opmode: ACCUM aperture: 1.0 sp_element: G270H num_exp: 1 time_per_exp: 44.0M s_to_n: 1440 fluxnum_1: 3 priority: 1 param_1: POLSCAN=8B comment_1: POLARIZATION ERROR 0.1% IN 2 A AT comment_2: 2500 A REQUIRES 127000 COUNTS IN 1 comment_3: PIXEL RESULTING IN STATED S/N PER comment_4: PIXEL IN SUM OF ALL 16 SPECTRA. ! linenum: 21.000 targname: HD207538 config: FOS/BL opmode: ACQ/PEAK aperture: 4.3 sp_element: G570H num_exp: 1 time_per_exp: 1.4S param_1: TYPE=UP param_2: SEARCH-SIZE-X=1 param_3: SEARCH-SIZE-Y=3 param_4: SCAN-STEP-Y=1.204 req_1: ONBOARD ACQ FOR 22 comment_1: COUNT RATE AT 4600 = 1900 ! linenum: 22.000 targname: HD207538 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0 sp_element: G570H num_exp: 1 time_per_exp: 2.4S param_1: TYPE=UP param_2: SEARCH-SIZE-X=6 param_3: SEARCH-SIZE-Y=2 param_4: SCAN-STEP-X=0.602 param_5: SCAN-STEP-Y=0.602 req_1: ONBOARD ACQ FOR 23 comment_1: COUNT RATE AT 4600 = 1220 ! linenum: 23.000 targname: HD207538 config: FOS/BL opmode: ACQ/PEAK aperture: 0.3 sp_element: G570H num_exp: 1 time_per_exp: 7.0S param_1: TYPE=UP param_2: SEARCH-SIZE-X=5 param_3: SEARCH-SIZE-Y=5 param_4: SCAN-STEP-X=0.17 param_5: SCAN-STEP-Y=0.17 req_1: ONBOARD ACQ FOR 24 comment_1: COUNT RATE AT 4600 = 780 ! linenum: 24.000 targname: HD207538 config: FOS/BL opmode: ACCUM aperture: 1.0 sp_element: G270H num_exp: 1 time_per_exp: 74.5M s_to_n: 1440 fluxnum_1: 3 priority: 1 param_1: POLSCAN=8B comment_1: POLARIZATION ERROR 0.1% IN 2 A AT comment_2: 2500 A REQUIRES 127000 COUNTS IN 1 comment_3: PIXEL RESULTING IN STATED S/N PER comment_4: PIXEL IN SUM OF ALL 16 SPECTRA. ! ! end of exposure logsheet ! No scan data records found