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The formation of the black hole in the X-ray binary system V404 Cyg
J. C. A. Miller-Jones, P. G. Jonker, G. Nelemans +5
Using new and archival radio data, we have measured the proper motion of the black hole X-ray binary V404 Cyg to be 9.2+/-0.3 mas/yr. Combined with the systemic radial velocity fro…
SDSS J080449.49+161624.8: A peculiar AM CVn star from a colour-selected sample of candidates
G. H. A. Roelofs, P. J. Groot, D. Steeghs +6
We describe a spectroscopic survey designed to uncover an estimated ~40 AM CVn stars hiding in the photometric database of the Sloan Digital Sky Survey (SDSS). We have constructed…
A planetary nebula around nova V458 Vul undergoing flash ionization
R. Wesson, M. J. Barlow, R. L. M. Corradi +25
Nova V458 Vul erupted on 2007 August 8th and reached a visual magnitude of 8.1 a few days later. H images obtained six weeks before the outburst as part of the IPHAS galactic pl…
A seismic approach to testing different formation channels of subdwarf B stars
Haili Hu, M. -A. Dupret, C. Aerts +5
There are many unknowns in the formation of subdwarf B stars. Different formation channels are considered to be possible and to lead to a variety of helium-burning subdwarfs. All s…
Southern Infrared Proper Motion Survey III: Constraining the mass function of low mass stars
N. R. Deacon, G. Nelemans, N. C. Hambly
The stellar mass function is one of the fundamental distributions of stellar astrophysics. Its form at masses similar to the Sun was found by Salpeter (1955) to be a power-law $m^{…
Discovery of the progenitor of the type Ia supernova 2007on
Rasmus Voss, Gijs Nelemans
Type Ia supernovae are exploding stars that are used to measure the accelerated expansion of the Universe and are responsible for most of the iron ever produced. Although there is…
Limits on the X-ray and optical luminosity of the progenitor of the type Ia supernova SN2007sr
Gijs Nelemans, Rasmus Voss, Gijs Roelofs +1
We present HST/WFPC2, GALEX and Chandra observations of the position of the type Ia supernova SN2007sr in the Antennae galaxies, taken before the explosion. No source is found in a…
On the detection of the progenitor of the type Ia supernova 2007on
Gijs Roelofs, Cees Bassa, Rasmus Voss +1
We present new Chandra X-ray observations and detailed astrometry of the field of the type Ia supernova 2007on, for which the detection of a likely progenitor in archival Chandra d…