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CSS100603:112253-111037: A helium-rich dwarf nova with a 65 minute orbital period
E. Breedt, B. T. Gaensicke, T. R. Marsh +3
We present time-resolved optical spectroscopy of the dwarf nova CSS100603:112253-111037. Its optical spectrum is rich in helium, with broad, double-peaked emission lines produced i…
The Unseen Population of F to K-type Companions to Hot Subdwarf Stars
J. Girven, D. Steeghs, U. Heber +6
We present a method to select hot subdwarf stars with A to M-type companions using photometric selection criteria. We cover a wide range in wavelength by combining GALEX ultraviole…
The chemical diversity of exo-terrestrial planetary debris around white dwarfs
B. T. Gaensicke, D. Koester, J. Farihi +3
We present HST ultraviolet spectroscopy of the white dwarfs PG0843+516, PG1015+161, SDSS1228+1040, and GALEX1931+0117, which accrete circumstellar planetary debris formed from the…
The evolutionary state of short period magnetic white dwarf binaries
E. Breedt, B. T. Gaensicke, J. Girven +4
We present phase-resolved spectroscopy of two new short period low accretion rate magnetic binaries, SDSSJ125044.42+154957.3 (Porb = 86 min) and SDSSJ151415.65+074446.5 (Porb = 89…
Mass ratio from Doppler beaming and Rømer delay versus ellipsoidal modulation in the Kepler data of KOI-74
S. Bloemen, T. R. Marsh, P. Degroote +18
We present a light curve analysis and radial velocity study of KOI-74, an eclipsing A star + white dwarf binary with a 5.2 day orbit. Aside from new spectroscopy covering the orbit…
Correlated X-ray/Ultraviolet/Optical variability in the very low mass AGN NGC 4395
D. T. Cameron, I. Mc Hardy, T. Dwelly +4
We report the results of a one year Swift X-ray/UV/optical programme monitoring the dwarf Seyfert nucleus in NGC 4395 in 2008-2009. The UV/optical flux from the nucleus was found t…