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Two white dwarfs with oxygen-rich atmospheres
B. T. Gaensicke, D. Koester, J. Girven +2
Stars with masses in the range 7-10Msun end their lives either as massive white dwarfs or weak type II supernovae, and there are only limited observational constraints of either ch…
The expanding bipolar shell of the helium nova V445 Puppis
P. A. Woudt, D. Steeghs, M. Karovska +8
From multi-epoch adaptive optics imaging and integral field unit spectroscopy we report the discovery of an expanding and narrowly confined bipolar shell surrounding the helium nov…
A census of AM CVn stars: three new candidates and one confirmed 48.3-minute binary
Arne Rau, Gijs H. A. Roelofs, Paul J. Groot +4
We present three new candidate AM CVn binaries, plus one confirmed new system, from a spectroscopic survey of color-selected objects from the Sloan Digital Sky Survey. All four sys…
Time-resolved spectroscopy of the pulsating CV GW Lib
L. van Spaandonk, D. Steeghs, T. R. Marsh +1
We present time-resolved optical spectroscopy of the dwarf nova GW Librae during its rare April 2007 super-outburst and compare these with quiescent epochs. The data provide the fi…
Following the 2008 outburst decay of the black hole candidate H1743-322 in X-ray and radio
P. G. Jonker, J. Miller-Jones, J. Homan +10
In this Paper we report on radio (VLA and ATCA) and X-ray (RXTE, Chandra and Swift) observations of the outburst decay of the transient black hole candidate H1743-322 in early 2008…
Optical spectroscopy of the quiescent counterpart to EXO 0748-676
C. G. Bassa, P. G. Jonker, D. Steeghs +1
We present phase resolved optical spectroscopy and X-ray timing of the neutron star X-ray binary EXO 0748-676 after the source returned to quiescence in the fall of 2008. The X-ray…