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HS0907+1902: a new 4.2hr eclipsing dwarf nova | B.T. Gaensicke
; R.E. Fried
; H.-J. Hagen
; K. Beuermann
; D. Engels
; F.V. Hessman
; D. Nogami
; K. Reinsch
; | Date: |
22 Mar 2000 | Subject: | astro-ph | Abstract: | 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. | Source: | arXiv, astro-ph/0003325 | Services: | Forum | Review | PDF | Favorites |
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