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The 2003 Nov 14 occultation by Titan of TYC 1343-1865-1. II. Analysis of light curves
A. Zalucha, A. Fitzsimmons, J. L. Elliot +6
We observed a stellar occultation by Titan on 2003 November 14 from La Palma Observatory using ULTRACAM with three Sloan filters: u', g', and i' (358, 487, and 758 nm, respectively…
Metal-rich debris discs around white dwarfs
B. T. Gaensicke, T. R. Marsh, J. Southworth +1
We have identified two moderately hot (~18000-22000K) white dwarfs, SDSSJ1228+1040 and SDSSJ1043+0855, which exhibit double-peaked emission lines in the CaII 8600A triplet. These l…
Bowen blend echo-tomography of low mass X-ray binaries
T. Muñoz-Darias, I. G. Martinez-Pais, J. Casares +7
We present simultaneous high time resolution (1-10 Hz) X-ray and optical observations of the persistent LMXBs Sco X-1 and V801 Ara(=4U 1636-536). In the case of Sco X-1 we find tha…
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…
Orbital periods of cataclysmic variables identified by the SDSS. II. Measurements for six objects, including two eclipsing systems
John Southworth, T. R. Marsh, B. T. Gaensicke +4
Continuing our work from Paper I (Southworth et al., 2006) we present medium-resolution spectroscopy and broad-band photometry of seven cataclysmic variables (CVs) discovered by th…
SDSS J150722.30+523039.8: a CV formed directly from a detached white dwarf/brown dwarf binary?
S. P. Littlefair, V. S. Dhillon, T. R. Marsh +3
We present high-speed, three-colour photometry of the eclipsing cataclysmic variable SDSS J150722.30+523039.8 (hereafter SDSS J1507). This system has an orbital period of 66.61 min…
High-Speed Optical Spectroscopy
T. R. Marsh
The large surveys and sensitive instruments of modern astronomy are turning ever more examples of variable objects, many of which are extending the parameter space to testing theor…
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…
SDSSJ104341.53+085558.2: A second white dwarf with a gaseous debris disc
B. T. Gaensicke, T. R. Marsh, J. Southworth
Intermediate resolution spectroscopy of the white dwarf SDSSJ104341.53+085558.2 contains double-peaked emission lines of CaII8498,8542,8662 and identifies this object to be the sec…
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…
ULTRACAM: an ultra-fast, triple-beam CCD camera for high-speed astrophysics
V. S. Dhillon, T. R. Marsh, M. J. Stevenson +15
ULTRACAM is a portable, high-speed imaging photometer designed to study faint astronomical objects at high temporal resolutions. ULTRACAM employs two dichroic beamsplitters and thr…
SDSS J233325.92+152222.1 and the evolution of intermediate polars
John Southworth, B. T. Gaensicke, T. R. Marsh +2
Intermediate polars (IPs) are cataclysmic variables which contain magnetic white dwarfs with a rotational period shorter than the binary orbital period. Evolutionary theory predict…
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…