Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124..287b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 2, Aug. 1983, p. 287-293.
Astronomy and Astrophysics
Astrophysics
18
Dwarf Novae, Eclipsing Binary Stars, Light Curve, Stellar Spectrophotometry, Variable Stars, Orbital Elements, Radial Velocity, Stellar Color, Stellar Evolution, Ubv Spectra
Scientific paper
High speed multicolor photometry and spectroscopy of BD Pav are presented. The object had been classified as a nova. A rediscussion of the eruption, however, suggests that BD Pav more likely is a dwarf nova with rare outbursts. Light curves in quiescence show a sharp eclipse feature, flickering activity, periodic W UMa like variations in B, V, R, and a typical U Gem hump light curve in U. The orbital period is 4.3 h, for which BD Pav is unusually red (G0-G5). Light and color variations of 0.5 and 0.1 mag, respectively, occur during the cycle. The spectra mainly show Balmer emission lines with complex profiles and occasionally He-emission. Radial velocity variations up to 600 km/s were found. The color and the different shapes of visual and ultraviolet light curves suggest a cataclysmic variable system with an exceptionally bright secondary as the main contributor to the visual luminosity. Due to the short orbital period a considerably evolved secondary may be assumed.
Barwig Heinz
Schoembs R.
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