ORFEUS and EUVE observations of AM herculis

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Far-UV spectra of AM Her in a high optical state were obtained in 1993 September with the University of California, Berkeley (UCB) spectrometer aboard the ORFEUS telescope. The UCB spectrometer has a spectral resolution {lambda}/{Delta}{lambda} 3000 and covers the 390-1170 {Angstrom} bandpass, but interstellar absorption leaves no detectable -flux below the Lyman limit. Spectra of AM Her were acquired during the intervals 04:19:40-04:36:26 UT on September 16 and 08:34:03-09:09:06 UT on September 17 of 1993. The corresponding magnetic phases are 0.75-0.84 and 0.88-1.07 according to the linear polarization ephemeris of S. Tapia. The main spectral features are the 0 VI ... continued below

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4 p.

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Mauche, C.W.; Paerels, F.B.S. & Raymond, J.C. April 6, 1995.

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  • Mauche, C.W. Lawrence Livermore National Lab., CA (United States)
  • Paerels, F.B.S. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  • Raymond, J.C. Center for Astrophysics, Cambridge, MA (United States)

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Far-UV spectra of AM Her in a high optical state were obtained in 1993 September with the University of California, Berkeley (UCB) spectrometer aboard the ORFEUS telescope. The UCB spectrometer has a spectral resolution {lambda}/{Delta}{lambda} 3000 and covers the 390-1170 {Angstrom} bandpass, but interstellar absorption leaves no detectable -flux below the Lyman limit. Spectra of AM Her were acquired during the intervals 04:19:40-04:36:26 UT on September 16 and 08:34:03-09:09:06 UT on September 17 of 1993. The corresponding magnetic phases are 0.75-0.84 and 0.88-1.07 according to the linear polarization ephemeris of S. Tapia. The main spectral features are the 0 VI doublet, C III {lambda}977, and He II {lambda}1085 (Balmer {gamma}). The bright C III {lambda}1176 multiplet, which is detected by IUE, is at the very end of the spectrum. At the full spectral resolution of the instrument, the 0 VI doublet shows broad and narrow components similar to that of the optical emission lines. The intensity ratio of the narrow component of the 0 VI doublet is {approximately} 1.3:1, much closer to the optically thick limit of 1:1 than the optically thin ratio of 2:1.

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4 p.

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OSTI as DE95012456

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  • ASP conference: Cape workshop on magetic cataclysmic variables, Cape Town (South Africa), 23-25 Jan 1995

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  • Other: DE95012456
  • Report No.: UCRL-JC--120557
  • Report No.: CONF-950189--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 79750
  • Archival Resource Key: ark:/67531/metadc734329

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  • April 6, 1995

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  • Oct. 19, 2015, 7:39 p.m.

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  • Feb. 19, 2016, 8:31 p.m.

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Mauche, C.W.; Paerels, F.B.S. & Raymond, J.C. ORFEUS and EUVE observations of AM herculis, article, April 6, 1995; California. (digital.library.unt.edu/ark:/67531/metadc734329/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.