! File: 1197C.PROP ! Database: PEPDB ! Date: 16-FEB-1994:05:36:11 coverpage: title_1: FOC OBSERVATIONS OF THE EXTENDED CHROMOSPHERE OF ALPHA SCO A sci_cat: STELLAR ASTROPHYSICS sci_subcat: COOL STARS proposal_for: GTO/HRS pi_fname: KENNETH pi_mi: G. pi_lname: CARPENTER pi_inst: NASA - GODDARD SPACE FLIGHT CENTER pi_country: USA pi_phone: 301-286-3453 keywords_1: COOL STARS: CHROMOSPHERES, WINDS, MASS LOSS; keywords_2: INTERACTING BINARIES. hours_pri: 1.00 num_pri: 1 foc: X realtime: X pi_position: ASTROPHYSICIST ! end of coverpage abstract: line_1: The aim of this proposal is to obtain direct imaging of the extended line_2: chromosphere/stellar wind of the cool supergiant star Alpha Sco A, using the line_3: FOC/288 mode in the ultraviolet. The spatial properties, such as asymmetric line_4: mass loss and the radial variation of density and temperature, of the wind will line_5: be investigated. We also hope to detect and study the ionization/shock front line_6: between this stellar wind and that from the companion B-star. The 0.4 arcsec line_7: coronographic finger will be used to block the disk of the B-star and prevent line_8: an overexposure of the FOC. ! ! end of abstract general_form_proposers: lname: BROWN fname: ALEXANDER inst: COLORADO, UNIVERSITY OF country: USA ! lname: LINSKY fname: JEFFREY mi: L. inst: COLORADO, UNIVERSITY OF country: USA ! lname: CARPENTER fname: KENNETH mi: G. inst: NASA - GODDARD SPACE FLIGHT CENTER country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: line_2: SUMMARY OF FOC OBSERVATIONS line_4: Target = Alpha Sco A We plan to obtain FOC image in the f/288 mode, in the line_5: light of selected chromospheric emission lines, as line_6: indicated below: line_8: PRIMARY LINES in Exposure times (minutes) in line_9: net bandpass 512x512 format 256x256 format line_11: C II 2325 A 10 3 line_12: Fe II 2500 A 5 4 line_13: Mg II 2800 A 6 3 line_14: Continuum 3300 A - 10 line_16: An interactive target acquisition will be performed to ensure that the B-star line_17: companion is place behind the occulting finger (0.4") before these observations line_18: are obtained. line_20: The continuum observation is designed to detect any light produced by line_21: scattering off of dust particles in the wind. line_23: The complicated filter selections (i.e. multiple filters in each observation) ! question: 3 section: 2 line_1: listed on the exposure logsheets are needed to eliminate possible overexposure line_2: due to the visual light leaks that occur with single filters. line_4: Total time on cover page = 42 min exposing + 18 min overhead = 60 min total line_6: To be done in cycle 2 with priority 2 line_9: Comment from EL page 10: We wish to review orientation and position info, line_10: and update them if necessary, shortly before these cycle 1 observations are line_11: actually scheduled. Info based on 272-degree A-to-B position angle and a line_12: 206-degree FOC-to-ST AXIS offset. line_13: Update (7/21/88): The FOC team (through Chris Blades) has line_14: indicated that the exact relationship (geometry) of the 0.4 line_15: occultation finger and the f/288 format is not known at this line_16: time and that precise positioning and orientation information line_17: cannot be given in this proposal until further data line_18: reduction by the FOC team has occurred. Furthermore, the line_19: handbook and Phase 2 instructions differ in their line_20: descriptions of the coordinate system and its relationship line_21: to the line scan and frame directions in the f/288 mode. line_22: Hence further updates to this proposal will be necessary line_23: after the FOC team has clarified the instructions and ! question: 3 section: 3 line_1: performed the necessary data reduction. The values assigned line_2: to the special requirements in the current version of the line_3: proposal are based on the information in the FOC handbook. ! question: 4 section: 1 line_1: This project requires very high spatial resolution at ultraviolet line_2: wavelengths. Clearly, therefore, satellite observations (ST) are required and line_3: the FOC is required since it is the only instrument capable of providing the line_4: needed spatial resolution. These observations test the FOC in its f/288 mode line_5: in a situation where photons should be plentiful. ! question: 5 section: 1 line_1: These observations must be scheduled at a time when the 0.4 arsec line_2: coronographic finger of the FOC can be used to hide the B-star companion of line_3: Alpha Sco A to avoid overexposing the FOC when properly exposing for the wind line_4: emission of the cool supergiant. line_5: The real-time acquisition observation is needed to ensure that the B-star line_6: is behind the occulting finger before the primary observations are obtained line_7: (see section 8). line_8: Schedule HRS observations of Alpha Sco A (from proposal WINDS OF COOL line_9: LUMINOUS STARS No. 1195) as close as possible after the FOC observations line_10: described in this proposal to insure that the data from both instruments line_11: represents the same state of the chromosphere, and to allow an update on the line_12: HRS acquisition of Alpha Sco A based on the final FOC positioning. ! question: 7 section: 1 line_1: The radial intensity variation of each emission line map will be used to line_2: derive the radial variation of density to first order since the flux of the line_3: permitted and intersystem lines to be observed vary to first order as Nedex2 line_4: and Ne, respectively. The decline of intensity will also be affected by any line_5: decrease in temperature and this can be studied by comparing the behavior of line_6: the different emission lines which all form preferentially at slightly line_7: different temperatures. The basis for such an analysis is already established line_8: from current chromospheric research. Typical electron densities in these line_9: regions are on the order of 10dex8 cm^-3 (Stencel et al. 1981 MNRAS 196, 478). line_10: The regions extend to at least 3 - 5 stellar radii and probably further, as line_11: supported by analysis of both UV emission lines such as the C II multiplet (see line_12: Carpenter, Brown, and Stencel 1985 Ap. J., 289,676) and radio continuum line_13: observations. ! question: 8 section: 1 line_1: We note once again that the 0.4 arcsec coronographic finger of the FOC line_2: must be used to avoid overexposing the FOC. The finger will be used to hide line_3: the B-star companion to Alpha Sco A. Note: Even though the B-star (Alpha Sco line_4: B) will be outside the area of the photocathode to be scanned during the line_5: requested IMAGE mode observations of Alpha Sco A, the finger is needed to line_6: prevent damage to the portion of the detector just outside the scanned area. line_7: The 2.9" separation of the 2 stars allows Alpha Sco B to occulted by the finger line_8: while Alpha Sco A is positioned near the center of the IMAGE mode field. Any line_9: necessary adjustment to the position of Alpha Sco A will be made during the line_10: interactive target acquisition. ! question: 13 section: 1 line_1: FOC images, in the light of selected chromospheric emission lines, of the line_2: Alpha Sco A wind/chromosphere will be obtained. The spatial properties of the line_3: wind, such as asymmetric mass loss and the radial variation of density and line_4: temperature, will be investigated and the interaction between the winds of the line_5: cool supergiant and its companion B-star will be studied. ! !end of general form text general_form_address: lname: CARPENTER fname: KENNETH mi: G. category: PI inst: NASA - GODDARD SPACE FLIGHT CENTER addr_1: CODE 681 city: GREENBELT state: MD zip: 20771 country: USA phone: 301-286-3453 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: HD148478 name_2: ALPHA-SCO-A descr_1: M1.5 IAB pos_1: RA=16H26M20.206S+/-.05", pos_2: DEC=-26D19'21.95"+/-.05" equinox: 1950 pm_or_par: Y pos_epoch_bj: B pos_epoch_yr: 1950.00 ra_pm_val: -0.000467 ra_pm_unct: 0.000067 dec_pm_val: -0.0230 dec_pm_unct: 0.0010 rv_or_z: V=-3 acqpr_1: COMP fluxnum_1: 1 fluxval_1: V=0.96+/-.3, fluxval_2: TYPE=M1.5 IAB ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: HD148478 config: FOC/288 opmode: ACQ aperture: 512X1024 sp_element: F8ND,F275W,F1ND num_exp: 1 time_per_exp: 1M s_to_n: 3 fluxnum_1: 1 priority: 2 param_1: PIXEL=25X25 req_1: CYCLE 2/1-8; req_2: INT ACQ FOR 2 - 8; req_3: ORIENT 118D +/- 1D/1-8; req_4: POS TARG 0,0/1-8; req_5: SEQ 2-8; req_6: GROUP 2-8 WITHIN 1D comment_1: ADDITIONAL FILTER F346M. INTERACTIVE comment_2: ACQ WILL BE USED TO VERIFY COMPANION comment_3: B-STAR BEHIND OCCULTATION FINGER. comment_4: EXPOSURES 2-8 WILL BE OBTAINED IN comment_5: IMAGE MODE, BUT COMPANION B-STAR TO comment_6: BE KEPT BEHIND 0.4 ARSEC FINGER AT ALL ! linenum: 2.000 targname: HD148478 config: FOC/288 opmode: IMAGE aperture: 512X512 sp_element: F4ND,F220W,F231M num_exp: 1 time_per_exp: 10M s_to_n: 9 priority: 2 req_1: SEQ 2 - 3 NO GAP comment_1: TIMES. B-STAR WILL BE OUTSIDE OF comment_2: ACTIVE FIELD OF VIEW BUT STILL ON THE comment_3: DETECTOR (THUS FINGER IS REQUIRED). comment_4: LISTED EXPOSURE TIMES BASED ON comment_5: SUMMATION OF UV LINE FLUXES OVER comment_6: BROAD WAVELENGTH REGIONS, CONVOLVED ! linenum: 3.000 targname: ^ config: ^ opmode: ^ aperture: 256X256 sp_element: F2ND,F220W,F231M num_exp: 1 time_per_exp: 3M s_to_n: 10 priority: 2 comment_1: WITH FILTER TRANSMISSIONS. THEREFORE comment_2: WE CANNOT GIVE A SINGLE REFERENCE comment_3: FLUX FOR EACH OBSERVATION. comment_4: ***> SEE GEN. FORM SECTION 3 FOR comment_5: NOTE ON ORIENTATION/POSITION SPEC'S. ! linenum: 4.000 targname: HD148478 config: FOC/288 opmode: IMAGE aperture: 256X256 sp_element: F2ND,F220W,F253M num_exp: 1 time_per_exp: 4M s_to_n: 15 priority: 2 req_1: SEQ 4 - 5 NO GAP ! linenum: 5.000 targname: ^ config: ^ opmode: ^ aperture: 512X512 sp_element: F2ND,F220W,F1ND num_exp: 1 time_per_exp: 5M s_to_n: 12 priority: 2 comment_1: ADDITIONAL FILTER F253M ! linenum: 6.000 targname: ^ config: ^ opmode: ^ aperture: 512X512 sp_element: F6ND,F220W,F1ND num_exp: ^ time_per_exp: 6M s_to_n: 10 priority: ^ req_1: SEQ 6 - 7 NO GAP comment_1: ADDITIONAL FILTER F278M ! linenum: 7.000 targname: ^ config: ^ opmode: ^ aperture: 256X256 sp_element: F4ND,F220W,F1ND num_exp: ^ time_per_exp: 3M s_to_n: 15 priority: ^ comment_1: ADDITIONAL FILTER F278M ! linenum: 8.000 targname: ^ config: ^ opmode: ^ aperture: ^ sp_element: F6ND,F275W,F1ND num_exp: ^ time_per_exp: 10M s_to_n: 10 priority: ^ comment_1: ADDITIONAL FILTER F346M ! ! end of exposure logsheet ! No scan data records found