Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..863m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, June 1984, p. 863-871.
Astronomy and Astrophysics
Astronomy
55
Infrared Astronomy, Stellar Spectra, Ultraviolet Astronomy, White Dwarf Stars, Astronomical Models, Iue, Lyman Alpha Radiation, Near Infrared Radiation, Spectral Line Width, Stellar Mass Accretion
Scientific paper
Nonsimultaneous IUE, optical, and near-IR observations of VW Hyi at quiescence are presented. Using these and UV data from other investigations, a broad feature in the ultraviolet is identified with L-alpha absorption. The presence and width of the line imply that (1) the white dwarf in VW Hyi is directly visible in the UV and (2) the effective temperature of this star is approximately 18,000 + or - 2000 K for log g = 8. The continuum observations, combined with the J and K photometry of Sherrington et al., (1980), can be fit with a combination of this relatively cool white dwarf and a steady-state disk model with an accretion rate of 10 to the -11th solar masses/yr. Additional observations of the hump in the optical light curve can be reasonably fit by a 12,000-K blackbody. Such a source is consistent with the hump being a minor contribution to the system's overall continuum distribution shortward of 2000 A and longward of about 1 micron.
Mateo Mario
Szkody Paula
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