A study of extreme-ultraviolet emission from cataclysmic variables

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168831· OSTI ID:6934524

Polidan, R S; Mauche, C W; Wade, R A ^[1]

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1. NASA, Goddard Space Flight Center, Greenbelt, MD (USA) Arizona Univ., Tucson (USA) Los Alamos National Laboratory, NM (USA) Steward Observatory, Tucson, AZ (USA)

Voyager far- and extreme UV spectrophotometric observations of five cataclysmic variables (the dwarf novae SS Cyg and VW Hyi and the novalike variables V3885 Sgr, RW Sex, and IX Vel) are combined with neutral hydrogen column densities derived from the curve-of-growth analysis of interstellar absorption lines in high-resolution IUE spectra to place upper limits on the emitted flux in the 600-700 A EUV band. The Voyager observations of VW Hyi were obtained during both normal and superoutbursts. Detailed accretion disk model calculations show that most of the 600-700 A flux in these systems should originate in the inner accretion disk rather than in the boundary layer. For VW Hyi, the low neutral hydrogen column and excellent Voyager superoutburst data place the observed upper limit to the 600-700 A flux well below the expected EUV flux from the model calculations. 43 refs.

• OSTI ID: 6934524
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 356; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCRETION DISKS
DWARF STARS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ERUPTIVE VARIABLE STARS
EXTREME ULTRAVIOLET RADIATION
FAR ULTRAVIOLET RADIATION
INTERSTELLAR SPACE
LIMITING VALUES
MAIN SEQUENCE STARS
NOVAE
RADIATION FLUX
RADIATIONS
SPACE
SPECTRA
STAR ACCRETION
STAR EVOLUTION
STARS
ULTRAVIOLET RADIATION
VARIABLE STARS