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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…
Hydrogen deficient donors in low-mass X-ray binaries
Gijs Nelemans
A number of X-ray binaries (neutron stars or black holes accreting from a companion star) have such short orbital periods that ordinary, hydrogen rich, stars do not fit in. Instead…
The long-period AM CVn star SDSS J155252.48+320150.9
G. H. A. Roelofs, P. J. Groot, D. Steeghs +2
The Sloan Digital Sky Survey has been instrumental in obtaining a homogeneous sample of the rare AM CVn stars: mass-transferring binary white dwarfs. As part of a campaign of spect…
The population of AM CVn stars from the Sloan Digital Sky Survey
G. H. A. Roelofs, G. Nelemans, P. J. Groot
The AM Canum Venaticorum stars are rare interacting white dwarf binaries, whose formation and evolution are still poorly known. The Sloan Digital Sky Survey provides, for the first…
An evolutionary study of the pulsating subdwarf B eclipsing binary PG1336-018 (NY Vir)
H. Hu, G. Nelemans, R. Østensen +3
The formation of subdwarf B (sdB) stars is not well understood within the current framework of stellar single and binary evolution. In this study, we focus on the formation and evo…
The binary properties of the pulsating subdwarf B eclipsing binary PG 1336-018 (NY Vir)
M. Vučković, C. Aerts, R. Østensen +5
We present an unbiased orbit solution and mass determination of the components of the eclipsing binary NY Vir as a critical test for the formation scenarios of subdwarf B stars. We…
HST/FGS Parallaxes of AM CVn Stars and Astrophysical Consequences
G. H. A. Roelofs, P. J. Groot, G. F. Benedict +5
We present absolute parallaxes and relative proper motions for five AM CVn stars, which we obtained using the Fine Guidance Sensors on board the Hubble Space Telescope. Our paralla…
On the orbital periods of the AM CVn stars HP Librae and V803 Centauri
G. H. A. Roelofs, P. J. Groot, G. Nelemans +2
We analyse high-time-resolution spectroscopy of the AM CVn stars HP Librae and V803 Centauri, taken with the New Technology Telescope (NTT) and the Very Large Telescope (VLT) of th…
Astrophysics of white dwarf binaries
G. Nelemans
White dwarf binaries are the most common compact binaries in the Universe and are especially important for low-frequency gravitational wave detectors such as LISA. There are a numb…
Faint Thermonuclear Supernovae from AM Canum Venaticorum Binaries
Lars Bildsten, Ken J. Shen, Nevin N. Weinberg +1
Helium that accretes onto a Carbon/Oxygen white dwarf in the double white dwarf AM Canum Venaticorum (AM CVn) binaries undergoes unstable thermonuclear flashes when the orbital per…
DE CVn: A bright, eclipsing red dwarf - white dwarf binary
E. J. M. van den Besselaar, R. Greimel, L. Morales-Rueda +10
Close white dwarf - red dwarf binaries must have gone through a common-envelope phase during their evolution. DE CVn is a detached white dwarf - red dwarf binary with a relatively…
ULTRACAM Photometry of the ultracompact binaries V407 Vul and HM Cnc
S. C. C. Barros, T. R. Marsh, V. S. Dhillon +6
V407 Vul (RXJ1914.4+2456) and HM Cnc (RXJ0806.3+1527) are X-ray emitting stars with X-ray light curves that are 100% modulated on periods of 569 and 321 seconds respectively. These…
SDSS J0926+3624, the first eclipsing AM CVn star, as seen by ULTRACAM
T. R. Marsh, V. S. Dhillon, S. Littlefair +6
We present light curves of SDSS J0926+3624, the first eclipsing AM CVn star, observed with the high-speed CCD camera ULTRACAM on the WHT. We find unusually that the accreting white…
Recent observational progress in AM CVn binaries
G. Ramsay, C. Brocksopp, P. Groot +9
We present the results of some recent research on AM CVn systems. We present: X-ray/UV observations made using XMM-Newton; the X-ray grating spectrum of RX J1914+24; preliminary re…
Short timescale variability in the Faint Sky Variability Survey
L. Morales-Rueda, P. J. Groot, T. Augusteijn +3
We present the V band variability analysis of the point sources in the Faint Sky Variability Survey on time scales from 24 minutes to tens of days. We find that about one percent o…
XMM-Newton observations of AM CVn binaries: V396 Hya & SDSS J1240-01
Gavin Ramsay, Paul J. Groot, Tom Marsh +3
We present the results of XMM-Newton observations of two AM CVn systems - V396 Hya and SDSS J1240-01. Both systems are detected in X-rays and in the UV: neither shows coherent vari…
Kinematics of the ultra-compact helium accretor AM Canum Venaticorum
G. H. A. Roelofs, P. J. Groot, G. Nelemans +2
We report on the results from a five-night campaign of high-speed spectroscopy of the 17-minute binary AM Canum Venaticorum, obtained with the 4.2-m William Herschel Telescope on L…