ORFEUS and EUVE observations of AM Herculis

Details ORFEUS and EUVE observations of AM Herculis ORFEUS and EUVE observations of AM Herculis

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aspc...85..298m&link_type=abstract

Cape Workshop on Magnetic cataclysmic variables; Astronomical Society of the Pacific Conference Series, Volume 85, Proceedings o

Astronomy and Astrophysics

Astronomy

5

Balmer Series, Binary Stars, Emission Spectra, Extreme Ultraviolet Radiation, Far Ultraviolet Radiation, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, Astronomical Spectroscopy, Extreme Ultraviolet Explorer Satellite, Iue, Ultraviolet Spectrometers

Scientific paper

Far-UV spectra of AM Her in a high optical state were obtained in September 1993 with the University of California, Berkeley (UCB) spectrometer aboard the ORFEUS telescope. The UCB spectrometer has a spectral resolution lambda/Delta-lambda approximately equal to 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. 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 O 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 O VI doublet shows broad and narrow components similar to that of the optical emission lines. The intensity ratio of the narrow component of the O 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. Extreme-UV observations of AM Her in a high optical state were obtained with the EUVE satellite approximately one week after the ORFEUS observations.

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