HS0907+1902: a new 4.2hr eclipsing dwarf nova

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dc.creatorGaensicke, B. T.
dc.creatorFried, R. E.
dc.creatorHagen, H. -J.
dc.creatorBeuermann, K.
dc.creatorEngels, D.
dc.creatorHessman, F. V.
dc.creatorNogami, D.
dc.creatorReinsch, K.
dc.date2000-03-22
dc.date.accessioned2026-07-25T17:42:28Z
dc.descriptionWe 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.
dc.description4 pages A&A-PSLatex, 5 Figures, accepted for publication in A&A Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/0003325
dc.identifierhttp://arxiv.org/abs/astro-ph/0003325
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/49727
dc.subjectAstrophysics
dc.titleHS0907+1902: a new 4.2hr eclipsing dwarf nova
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