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Astron. Astrophys. 356, L79-L82 (2000)


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Letter to the Editor

HS 0907+1902: a new 4.2 hr eclipsing dwarf nova

B.T. Gänsicke 1, R.E. Fried 2, H.-J. Hagen 3, K. Beuermann 1, D. Engels 3, F.V. Hessman 1, D. Nogami 1 and K. Reinsch 1

1 Universitäts-Sternwarte, Geismarlandstrasse 11, 37083 Göttingen, Germany
2 Braeside Observatory, PO Box 906, Flagstaff, AZ 86002, USA
3 Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany

Received 3 March 2000 / Accepted 21 March 2000

Abstract

We report on follow-up spectroscopy and photometry of the cataclysmic variable candidate HS 0907+1902 selected from the Hamburg Quasar Survey. B, V, and R photometry obtained during the first observed outburst of HS 0907+1902 ([FORMULA]) reveals deep eclipses ([FORMULA]) and an orbital period [FORMULA] h 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 [FORMULA] from the eclipse duration. The quiescent spectrum obtained with the Hobby-Eberly Telescope shows double peaked emission lines of H I, He I and Fe I,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 M[FORMULA] and a distance of [FORMULA] pc are derived.

Key words: accretion, accretion disks – surveys – stars: binaries: close – stars: binaries: eclipsing – stars: individual: HS 0907+1902 – stars: novae, cataclysmic variables

Send offprint requests to: boris@uni-sw.gwdg.de

© European Southern Observatory (ESO) 2000

Online publication: April 17, 2000

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