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J/A+A/510/A100 Four new SDSS eclipsing systems (Southworth+, 2010)
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Beginning of ReadMe :J/A+A/510/A100 Four new SDSS eclipsing systems (Southworth+, 2010)
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Orbital periods of cataclysmic variables identified by the SDSS.
VII. Four new eclipsing systems.
Southworth J., Copperwheat C.M., Gaensicke B.T., Pyrzas S.
<Astron. Astrophys. 510, A100 (2010)>
=2010A&A...510A.100S
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ADC_Keywords: Binaries, eclipsing ; Planets ; Photometry
Keywords: stars: dwarf novae - stars: novae, cataclysmic variables -
stars: binaries: eclipsing - stars: white dwarfs
Abstract:
We present photometry of nine cataclysmic variable stars identified by
the Sloan Digital Sky Survey, aimed at measuring the orbital periods
of these systems. Four of these objects show deep eclipses, from which
we measure their orbital periods. The light curves of three of the
eclipsing systems are also analysed using the LCURVE code, and their
mass ratios and orbital inclinations determined.
SDSS J075059.97+141150.1 has an orbital period of
134.1564+/-0.0008min, making it a useful object with which to
investigate the evolutionary processes of cataclysmic variables.
SDSS J092444.48+080150.9 has a period of 131.2432+/-0.0014min and
is probably magnetic. The white dwarf ingress and egress phases are
very deep and short, and there is no clear evidence that this object
has an accretion disc.
SDSS J115207.00+404947.8 and SDSS J152419.33+220920.1 are nearly
identical twins, with periods of 97.5+/-0.4 and 93.6+/-0.5min and mass
ratios of 0.14+/-0.03 and 0.17+/-0.03, respectively. Their eclipses
have well-defined white dwarf and bright spot ingress and egress
features, making them excellent candidates for detailed study. All
four of the orbital periods presented here are shorter than the 2-3
hour period gap observed in the known population of cataclysmic
variables.
Description:
Light curves of four eclipsing cataclysmic variable stars and five
non-eclipsing cataclysmic variables are presented. The data were
obtained using the ESO/NTT/EFOSC2 and ING/WHT/ACAM telescopes and
instruments. For the NTT a Tyson B filter was used (ESO filter #724)
whereas for the WHT a Johnson V filter was used.