4 papers
Search for double degenerate progenitors of supernovae type Ia with SPY
R. Napiwotzki, H. Drechsel, U. Heber +13
We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surve…
Properties of a spectroscopically selected CV sample
Boris T. Gaensicke, H. -J. Hagen, D. Engels
We have initiated a dedicated search for new CVs, selecting candidates on the base of their spectroscopic properties in the Hamburg Quasar Survey (HQS), which lead up to now to the…
HST spectroscopy of the double QSO HS 1216+5032 AB
Sebastian Lopez, Hans-Juergen Hagen, Dieter Reimers
(Abridged) We report on HST FOS observations of the double QSO HS 1216+5032 AB (z(A)=1.455; z(B)=1.451, and angular separation theta=9 arcsec). An unusual broad-absorption-line (BA…
HS0907+1902: a new 4.2hr eclipsing dwarf nova
B. T. Gaensicke, R. E. Fried, H. -J. Hagen +5
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…