HS0907+1902: a new 4.2hr eclipsing dwarf nova

Details HS0907+1902: a new 4.2hr eclipsing dwarf nova HS0907+1902: a new 4.2hr eclipsing dwarf nova

2000-03-22

arxiv.org/abs/astro-ph/0003325v1

Astronomy and Astrophysics

Astrophysics

4 pages A&A-PSLatex, 5 Figures, accepted for publication in A&A Letters

Scientific paper

We report on follow-up spectroscopy and photometry of the cataclysmic variable candidate HS0907+1902 selected from the Hamburg Quasar Survey. B, V, and R photometry obtained during the first observed outburst of HS0907+1902 (V~13) reveals deep eclipses (DeltaV~2.1-2.8) and an orbital period Porb=4.2h with the eclipse depth decreasing to the red. The outburst eclipse profiles are symmetric, indicating an axisymmetrical brightness distribution in the accretion disc. We derive an inclination i~73deg-79deg from the eclipse duration. The quiescent spectrum obtained with the Hobby-Eberly Telescope shows double peaked emission lines of HI, HeI and FeI,II and clearly identifies the system as a dwarf nova. Absorption features of the secondary star are detected at red wavelengths from which a spectral class M3+-1.5 and a distance of d=320+-100pc are derived.

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