Publications (44)
Photometric Observations of the Type Ia SN 2002er in UGC 10743
G. Pignata, F. Patat, S. Benetti +20
Extensive light and colour curves for the Type Ia supernova SN 2002er are presented as part of the European Supernova Collaboration. We have collected UBVRI photometry from ten dif…
The Liverpool Telescope Spectrograph: FRODOSpec
L. Morales-Rueda, D. Carter, I. A. Steele +2
We describe in some detail one of the instruments that will be available in 2004 to the research community. FRODOSpec is an integral field unit spectrograph that will be available…
Subdwarf B binaries in the Edinburgh-Cape Survey
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh +2
We give an update of the results of a campaign to obtain orbital solutions of subdwarf B stars from the Edinburgh-Cape survey (Stobie et al. 1997). To date we have obtained blue sp…
Optical spectroscopy of the dwarf nova U Geminorum
E. Unda-Sanzana, T. R. Marsh, L. Morales-Rueda
U Gem is unique in having a direct measurement of K1 = 107 +- 2 km/s, Long et al. 1999). We present high-resolution optical spectra of the dwarf nova U Gem in quiescence taken to t…
The mass and radius of the M-dwarf in the short period eclipsing binary RR Caeli
P. F. L. Maxted, D. O'Donoghue, L. Morales-Rueda +1
We present new photometry and spectroscopy of the eclipsing white dwarf - M-dwarf binary star RR Cae. We use timings of the primary eclipse from white-light photo-electric photomet…
Initial Data Release from the INT Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS)
E. A. Gonzalez-Solares, N. A. Walton, R. Greimel +47
The INT/WFC Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS) is an imaging survey being carried out in H-alpha, r' and i' filters, with the Wide Field Camera (WFC)…
Six detached white-dwarf close binaries
L. Morales-Rueda, T. R. Marsh, P. F. L. Maxted +4
We determine the orbits of four double degenerate systems (DDs), composed of two white dwarfs, and of two white dwarf -- M dwarf binaries. The four DDs, WD1022+050, WD1428+373, WD1…
GD 552: a cataclysmic variable with a brown dwarf companion?
E. Unda-Sanzana, T. R. Marsh, B. T. Gansicke +7
GD 552 is a high proper motion star with the strong, double-peaked emission lines characteristic of the dwarf nova class of cataclysmic variable star, and yet no outburst has been…
A first look at cataclysmic variable stars from the 2dF QSO survey
T. R. Marsh, L. Morales-Rueda, D. Steeghs +9
The 2dF QSO survey is a spectroscopic survey of 48,000 point-sources selected by colour with magnitudes in the range 18.35 < B < 20.95. Amongst QSOs, white dwarfs, narrow-line gala…
Photometry of four binary subdwarf B stars and the nature of their unseen companion stars
P. F. L. Maxted, T. R. Marsh, U. Heber +3
We present lightcurves of four binary subdwarf B stars, Ton 245, Feige 11, PG1432+159 and PG1017-086. We also present new spectroscopic data for PG1017-086 from which we derive its…
PG1018-047: the longest period subdwarf B binary
J. Deca, T. R. Marsh, R. H. Ãstensen +7
About 50% of all known hot subdwarf B stars (sdBs) reside in close (short period) binaries, for which common envelope ejection is the most likely formation mechanism. However, Han…
The UV-Excess Survey of the Northern Galactic Plane (UVEX)
Paul J. Groot, K. Verbeek, R. Greimel +41
The UV-Excess Survey of the Northern Galactic Plane images a 10x185 degree wide band, centered on the Galactic Equator using the 2.5m Isaac Newton Telescope in four bands (U,g,r,He…
The orbital period distribution of subdwarf B binaries
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh
We present the results of a 3.5 year long campaign to measure orbital periods of subdwarf B (sdB) star binaries. We directly compare our observed orbital period distribution with t…
White dwarfs in the European Galactic Plane Surveys (EGAPS)
L. Morales-Rueda, P. J. Groot, R. Napiwotzki +2
The space density of white dwarfs is highly uncertain even nearby. This results from the fact that the known sample of white dwarfs is largely incomplete in part because most white…
The 1996 dwarf nova outburst of the intermediate polar GK Persei
L. Morales-Rueda, M. D. Still, P. Roche
GK Persei is an intermediate polar that exhibits a dwarf nova outburst approximately every 1000 days. During previous outbursts the system has displayed kilo-second quasi-periodic…
Doppler tomography of Cataclysmic Variables
L. Morales-Rueda
The study of cataclysmic variables (CVs), and in particular of the evolution of their accretion discs throughout their different brightness states, has benefited largely from the u…
Hot subdwarf stars in close-up view IV. Helium abundances and the He isotopic anomaly of subdwarf B star
S. Geier, U. Heber, H. Edelmann +5
Atmospheric parameters and helium abundances of 44 bright subdwarf B stars have been determined. More than half of our sample consists of newly discovered stars from the Edinburgh…
Spiral shock detection on eclipse maps: Simulations and Observations
E. T. Harlaftis, R. Baptista, L. Morales-Rueda +2
We perform simulations in order to reveal the effect of observational and physical parameters on the reconstruction of a spiral structure in an accretion disk, using eclipse mappin…
New results on GP Com
L. Morales-Rueda, T. R. Marsh, D. Steeghs +3
We present high resolution optical and UV spectra of the 46 min orbital period, helium binary, GP Com. Our data contains simultaneous photometric correction which confirms the flar…
New subdwarf B star periods
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh +1
Subdwarf B (sdB) stars are thought to be helium burning stars with low mass hydrogen envelopes. Several evolutionary paths have been proposed to explain the formation of these syst…
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…
The Properties of Cataclysmic Variables In Photometric Halpha Surveys
A. R. Witham, C. Knigge, B. T. Gaensicke +9
We report on the properties of 71 known cataclysmic variables (CVs) in photometric Halpha emission line surveys. Our study is motivated by the fact that the Isaac Newton Telescope…
Helium abundances and the helium isotope anomaly of sdB stars
S. Geier, U. Heber, H. Edelmann +5
Helium abundances and atmospheric parameters have been determined from high resolution spectra for a new sample of 46 bright hot subdwarf B (sdB) stars. The helium abundances have…
Cataclysmic variables from a ROSAT/2MASS selection I: Four new intermediate polars
B. T. Gaensicke, T. R. Marsh, A. Edge +8
We report the first results from a new search for cataclysmic variables (CVs) using a combined X-ray (ROSAT) / infrared (2MASS) target selection that discriminates against backgrou…
Solving the kilo-second QPO problem of the intermediate polar GK Persei
L. Morales-Rueda, M. D. Still, P. Roche
We detect the likely optical counterpart to previously reported X-ray QPOs in spectrophotometry of the intermediate polar GK Persei during the 1996 dwarf nova outburst. The charact…
The stellar mass ratio of GK Persei
L. Morales-Rueda, M. D. Still, P. Roche +2
We study the absorption lines present in the spectra of the long-period cataclysmic variable GK Per during its quiescent state, which are associated with the secondary star. By com…
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…
Rotational properties of single and wide binary subdwarf B stars
S. Geier, U. Heber, H. Edelmann +2
We measured projected rotational velocities of more than a hundred apparently single sdBs. A comparison is made with sdB stars in binary systems with orbits so wide, that tidal int…
Spectral atlas of dwarf novae in outburst
L. Morales-Rueda, T. R. Marsh
Up to now, only a very small number of dwarf novae have been studied during their outburst state (~30 per cent in the Northern hemisphere). In this paper we present the first compr…
RX J2130.6+4710 - an eclipsing white dwarf - M-dwarf binary star
P. F. L. Maxted, T. R. Marsh, L. Morales-Rueda +5
(Abridged) We report the detection of eclipses in the close white-dwarf - M-dwarf binary star RXJ2130.6+4710. We estimate that the spectral type of the M-dwarf is M3.5Ve or M4Ve. W…
Searching for spiral shocks
L. Morales-Rueda, T. R. Marsh
Spiral shocks in cataclysmic variables (CVs) are the result of tidal interactions of the mass donor star with the accretion disc. Their study is fundamental for our understanding o…
Rotational period of WD1953-011 - a magnetic white dwarf with a star spot
C. S. Brinkworth, T. R. Marsh, L. Morales-Rueda +3
WD1953-011 is an isolated, cool (7920 +/- 200K, Bergeron, Legget & Ruiz, 2001) magnetic white dwarf (MWD) with a low average field strength (~70kG, Maxted et al. 2000) and a higher…
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…
Tracing the spiral arms in IP Pegasi
R. Baptista, L. Morales-Rueda, E. T. Harlaftis +2
We report the analysis of time-resolved spectroscopy of IP Pegasi in outburst with eclipse mapping techniques to investigate the location and geometry of the observed spiral struct…
Spiral structure in IP Pegasi; how persistent is it?
L. Morales-Rueda, T. R. Marsh, I. Billington
We present spectroscopy of the dwarf nova IP Pegasi taken during two consecutive nights, 5 and 6 days after the start of an outburst. Even this late in the outburst, Doppler maps s…
Mapping the peculiar binary GP Com
L. Morales-Rueda, T. R. Marsh, R. C. North
We present high resolution spectra of the AM CVn helium binary GP Com at two different wavelength ranges. The spectra show the same flaring behaviour observed in previous UV and op…
Photometric Variability in the Faint Sky Variability Survey
L. Morales-Rueda, P. J. Groot, T. Augusteijn +3
The Faint Sky Variability Survey (FSVS) is aimed at finding photometric and/or astrometric variable objects between 16th and 24th mag on time-scales between tens of minutes and yea…
Discovery of a close substellar companion to the hot subdwarf star HD 149382 - The decisive influence of substellar objects on late stellar evolution
S. Geier, H. Edelmann, U. Heber +1
Substellar objects, like planets and brown dwarfs orbiting stars, are by-products of the star formation process. The evolution of their host stars may have an enourmous impact on t…
Subdwarf B Binaries from the Edinburgh--Cape Survey
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh +2
We present the first results of a campaign to obtain orbital solutions of subdwarf B (sdB) stars from the Edinburgh-Cape survey. We have obtained blue spectra of 35 sdBs, 20 of whi…
Mapping quasi-periodic oscillations from the outbursting intermediate polar GK Persei
L. Morales-Rueda, M. D. Still, P. Roche
We present time-resolved spectrophotometry of GK Per taken on the rise to outburst maximum, in which we detect 5000 s QPOs in the optical emission lines. We use this opportunity to…
Low-mass stellar and substellar companions to sdB stars
S. Geier, L. Classen, P. Bruenner +9
It has been suggested that besides stellar companions, substellar objects in close orbits may be able to trigger mass loss in a common envelope phase and form hot subdwarfs. In an…
Orbital periods of twenty two subdwarf B stars
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh +2
Subdwarf B (sdB) stars are thought to be core helium burning stars with low mass hydrogen envelopes. In recent years it has become clear that many sdB stars lose their hydrogen thr…
Radial velocity measurements of Subdwarf B stars
C. M. Copperwheat, L. Morales-Rueda, T. R. Marsh +2
Subdwarf B (sdB) stars are hot, sub-luminous stars which are thought to be core-helium burning with thin hydrogen envelopes. The mechanism by which these stars lose their envelopes…
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 p…