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SDSS J162718.39+120435.0 - a dwarf nova in the period gap
Jeremy Shears, Steve Brady, Boris Gaensicke +5
SDSS J162718.39+120435.0 was suspected of being a dwarf nova from spectroscopic observations made available by the Sloan Digital Sky Survey. Photometry conducted during the 2008 ou…
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…
Orbital periods of cataclysmic variables identified by the SDSS. V. VLT, NTT and Magellan observations of nine equatorial systems
John Southworth, B T Gaensicke, T R Marsh +6
We present VLT and Magellan spectroscopy and NTT photometry of nine faint cataclysmic variables (CVs) which were spectroscopically identified by the SDSS. We measure orbital period…
IPHAS discoveries of young stars towards Cyg OB2 and its southern periphery
Jorick S. Vink, Janet E. Drew, Danny Steeghs +5
We report on the discovery of over 50 strong Halpha emitting objects towards the large OB association Cyg OB2 and the HII region DR 15 on its southern periphery. This was achieved…
Orbital periods of cataclysmic variables identified by the SDSS. III. Time-series photometry obtained during the 2004/5 International Time Project on La Palma
M. Dillon, B. T. Gaensicke, A. Aungwerojwit +7
We present time resolved CCD photometry of 15 cataclysmic variables (CVs) identified by the Sloan Digital Sky Survey (SDSS). The data were obtained as part of the 2004/05 Internati…
The IPHAS Catalogue of Halpha Emission Line Sources in the Northern Galactic Plane
A. R. Witham, C. Knigge, J. E. Drew +5
We present a catalogue of point-source Halpha emission line objects selected from the INT/WFC Photometric H Survey of the Northern Galactic Plane (IPHAS). The catalogue covers t…
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)…
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…
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…
The ultra-compact binary candidate KUV 23182+1007 is a bright quasar
John Southworth, A. Schwope, B. T. Gaensicke +1
KUV 23182+1007 was identified as a blue object in the Kiso UV Survey in the 1980s. Classification-dispersion spectroscopy showed a featureless continuum except for a strong emissio…
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…
HST and Optical Observations of Three Pulsating Accreting White Dwarfs in Cataclysmic Variables
Paula Szkody, Anjum Mukadam, Boris T. Gaensicke +8
Ultraviolet observations using the Solar Blind Channel on the Hubble Space Telescope provide light curves and low resolution spectra of three pulsating white dwarfs in the cataclys…
An in-depth study of the pre-polar candidate WX LMi
J. Vogel, A. D. Schwope, B. T. Gaensicke
Optical photometry, spectroscopy and XMM-Newton ultraviolet and X-ray observations with full phase coverage are used for an in-depth study of WXLMi, a system formerly termed as a l…
Irradiated atmospheres of accreting magnetic white dwarfs with an application to the polar AM Herculis
M. Koenig, K. Beuermann, B. T. Gaensicke
We present a pilot study of atmospheres of accreting magnetic white dwarfs irradiated by intense fluxes at ultraviolet to infrared wavelengths. The model uses a standard LTE stella…
HS0139+0559, HS0229+8016, HS0506+7725 and HS0642+5049: Four new long-period cataclysmic variables
A. Aungwerojwit, B. T. Gaensicke, P. Rodriguez-Gil +9
We present time-resolved optical spectroscopy and photometry of four relatively bright (V~14.0-15.5) long-period cataclysmic variables (CVs) discovered in the Hamburg Quasar Survey…
HS 0943+1404, a true intermediate polar
P. Rodriguez-Gil, B. T. Gaensicke, H. -J. Hagen +7
We have identified a new intermediate polar, HS 0943+1404, as part of our ongoing search for cataclysmic variables in the Hamburg Quasar Survey. The orbital and white dwarf spin pe…
Observational population studies of cataclysmic variables - The golden era of surveys
B. T. Gaensicke
We review the properties of the currently known CV population from an accountants point of view. In particular, it is examined to what extent different selection mechanisms (variab…
Time-Resolved Ultraviolet Spectroscopy of the SW Sex Star DW UMa: Confirmation of a Hidden White Dwarf and the UV Counterpart to Phase 0.5 Absorption Events
Christian Knigge, Sofia Araujo-Betancor, Boris T. Gaensicke +5
We present time-resolved, ultraviolet (UV) spectroscopy of the SW Sex star DW UMa in the high state. We confirm that, shortward of 1500 Å, the high-state, UV continuum level is low…
Detection of the white dwarf and the secondary star in the new SU UMa dwarf nova HS 2219+1824
P. Rodriguez-Gil, B. T. Gaensicke, H. -J. Hagen +4
We report the discovery of a new, non-eclipsing SU UMa-type dwarf nova, HS 2219+1824. Photometry obtained in quiescence (V ~ 17.5) reveals a double-humped light curve from which we…
IR spectroscopy of pre-cataclysmic binaries
C. Tappert, B. T. Gaensicke, R. E. Mennickent
We have taken near-infrared (JHK) spectroscopic data of a sample of pre-CVs, in order to examine them for signatures of nuclear evolution. Here we present preliminary results for t…
A 150MG magnetic white dwarf in the cataclysmic variable RX J1554.2+2721
B. T. Gaensicke, S. Jordan, K. Beuermann +4
We report the detection of Zeeman-split Lalpha absorption pi and sigma+ lines in the far-ultraviolet Hubble Space Telescope/Space Telescope Imaging Spectrograph spectrum of the mag…
Time-resolved photometry and spectroscopy of the new deeply-eclipsing SW Sextantis star HS 0728+6738
P. Rodriguez-Gil, B. T. Gaensicke, H. Barwig +2
We present time-resolved optical spectroscopy and photometry, and far-ultraviolet spectroscopy of HS 0728+6738, a cataclysmic variable discovered in the Hamburg Quasar Survey. We s…
DW Cancri: a magnetic VY Scl star with an orbital period of 86 minutes
P. Rodriguez-Gil, B. T. Gaensicke, S. Araujo-Betancor +1
We present the first time-resolved spectroscopic study of the cataclysmic variable DW Cancri. We have determined an orbital period of 86.10 +- 0.05 min, which places the system ver…
WZ Sge: HST Spectroscopy of the Cooling of the White Dwarf after the 2001 Outburst
Knox S. Long, Edward M. Sion, Boris T. Gaensicke +1
Following an outburst in 2001 July, the UV flux of WZ Sge has declined slowly toward pre-outburst levels. Here, we describe new 1150-1710 Angstrom HST/STIS spectra of WZ Sge obtain…