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.
@article{arxiv.astro-ph/0003325,
title = {HS0907+1902: a new 4.2hr eclipsing dwarf nova},
author = {B. T. Gaensicke and R. E. Fried and H. -J. Hagen and K. Beuermann and D. Engels and F. V. Hessman and D. Nogami and K. Reinsch},
journal= {arXiv preprint arXiv:astro-ph/0003325},
year = {2007}
}
Comments
4 pages A&A-PSLatex, 5 Figures, accepted for publication in A&A Letters