-------------+--------------------------------------------+--------------------- | FFFFFF OOOOOO SSS | STScI | FF OO OO SS | STAN - FOS Analysis | FFFF OO OO SS | Number 3 News | FF OO OO SS | December 1994 | FF OOOOOO SSS | -------------+--------------------------------------------+--------------------- CONTENTS: - FOS NEWS + Safing event + Erratum in CAL/FOS-130 Table 14 - RECENT FOS SCIENCE - OBSERVATION LOG FILES PRODUCED VIA THE PIPELINE - APPENDIX: FOS CONTACTS ================================================================================ FOS News -------- Safing Event ------------ The FOS safed due to the "overlight" limit being exceeded during a MIRROR acquisition of a highly variable object on 30 November 1994. Three additional observations that were scheduled between 30 November and 4 December 1994 obtained no data due to the safing. Problem reports were filed for the additional programs and the observations will be rescheduled. The onboard computer monitors the total number of counts detected by the FOS in each 60-second interval. If within a single OBSET two such intervals produce count levels above a conservatively specified safety limit, the "overlight" limit, the FOS will safe. The FOS was recovered from safemode on 5 December 1994 and has functioned nominally since that time. Erratum in CAL/FOS-130 Table 14 ------------------------------- A typographical error existed in the specification of the currently recommended IVS reference file for FOS/RED G270H and the C-1B (or 1.0-PAIR-LOWER) aperture in Table 14 of recently published CAL/FOS-130, "Calibration Product Review for the FOS". The table listed non-existent files, e3h1772y.r2h and .r2d, whereas the correct entries should be e3h14472y.r2h and .r2d This error also occurred in the on-line and printed PostScript versions of the report, but NOT in the ASCII-text version, of the "POST-COSTAR FOS Calibration File and Table Reference Guide for IVS" which may be accessed via the STScI FOS Homepage. The error has been corrected in all on-line documents. Additionally, please note that queries to the HST archive will return the correct filenames. ================================================================================ RECENT FOS SCIENCE ------------------ We draw your attention to these papers, based on FOS data, that will appear in the next few months. This list includes all preprints received by the STScI Library not yet published in the journals. Please remember to include our Library in your preprint distribution list. "HST/FOS spectroscopy of eta Carinae: the star itself, and ejecta within 0.3"" Davidson, K.; Ebbets, D.; Weigelt, G.; Humphreys, R.M.; Hajian, A.R.; Walborn, N.R.; Rosa, M.; 1995 AJ in press. "Lyman alpha emission from galaxies: the case of absorption line selected galaxies at z ~ 0.3 - 0.4" Deharveng, J.-M.; Buat, V.; Bergeron, J., 1995 A&A in press. "The evolution of C/O in dwarf galaxies from HST FOS observations" Garnett, D.R.; Skillman, E.D.; Dufour, R.J.; Peimbert, M.; Torres-Peimbert, S.; Terlevich, R.; Terlevich, E.; Shields,G.A., 1995 ApJ in press. "Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VIII. An intensive HST, IUE, and ground-based study of NGC 5548" Korista, K.T.; Alloin, D.; Barr, P.; Clavel, J.; et al. 1995 ApJ in press. "The dim accretion disk of the quiescent black hole A0620-00" McClintock, J.E.; Horne, K.; Remillard, R.A., 1995 ApJ in press. ================================================================================ OBSERVATION LOG FILES PRODUCED VIA THE PIPELINE ----------------------------------------------- The Observation Log files contain a specialized set of pointing and engineering data associated with each science exposure (including the jitter information). Observation Log files for most science observations since October 20 1994 have been produced by the pipeline and written to the HST archive. Starting at the end of February 1995, these files will also be included on the data tapes sent to observers. A more detailed description of the Observation Log can be found in an article by O. Lupie, B. Toth and S. Baum in the forthcoming December issue of the STScI Newsletter. The Observation Log header file contains, among other things, - keywords describing the actual (not requested but executed) tracking mode achieved at the end of the guide star acquisition process, - the rms and maximum of the jitter (motion of the Fine Guidance Sensors during the observation), - the number of occurrences of loss of lock and recenterings and - the reconstructed absolute pointing. The header also alerts the observer to slews occurring during an observation and reports anomalies that can compromise the integrity of the science data (e.g., degraded guide star acquisitions, losses of lock), or result in a failed observation (e.g., instrument or vehicle safings, failed target acquisitions). The data portion of the log file contains pointing data and other parameters that are traced as a function of time during an exposure including the `jitter', i.e., the movement of the aperture as a function of time during the observation. Additional information about the Observation Log Files and how to retrieve them from the HST Archive can be found within the HST Archive Page under the STScI home page (http://www.stsci.edu/top.html). Once in the archive pages, click on Retrieving HST Data and refer to the section on Observation Log Files. ================================================================================ APPENDIX: FOS contacts ----------------------- Any questions about the scheduling of your observations should be addressed to your PRESTO contact. If you do not know who this person is, PRESTO's Mosaic page (http://presto.stsci.edu/public/propinfo.html) contains that information. Post-Observation questions should be addressed to the FOS Analysis Team, if your program is covered by this pilot project or analysis@stsci.edu (410-338-1082). FOS Analysis Team: ------------------ Analysis Scientist: Jeffrey Hayes - hayes@stsci.edu - 410-338-4936 Analysis Specialist: Jennifer Christensen - christen@stsci.edu - 410-338-1265 Analysis Specialist: Stephan Martin - smartin@stsci.edu - 410-338-4724 http://www.stsci.edu/observer/ateam.html FOS Instrument Scientists: -------------------------- Anne Kinney kinney@stsci.edu 410-338-4831 Anuradha Koratkar koratkar@stsci.edu 410-338-4470 Tony Keyes keyes@stsci.edu 410-338-4975 http://www.stsci.edu/ftp/instrument_news/FOS/topfos.html ================================================================================ Comments, questions, requests for issues, additions or deletions to the mailing list, etc. can be e-mailed to analysis@stsci.edu ================================================================================ The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. ================================================================================