J/A+A/510/A100 Four new SDSS eclipsing systems (Southworth+, 2010)
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 2010A&A...510A.100S
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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 104 9 List of the stars
j0310b.dat 39 105 SDSS J031051.66-075500.2 NTT (B band) photometry
j0743b.dat 39 122 SDSS J074355.55+183834.8 NTT (B band) photometry
j0746b.dat 39 182 SDSS J074640.61+173412.7 NTT (B band) photometry
j0750b.dat 39 352 SDSS J075059.97+141150.1 NTT (B band) photometry
j0750v.dat 39 164 SDSS J075059.97+141150.1 WHT (V band) photometry
j0758b.dat 39 177 SDSS J075808.81+104345.5 NTT (B band) photometry
j0906b.dat 39 238 SDSS J090628.24+052656.9 INT (B band) photometry
j0906r.dat 39 85 SDSS J090628.24+052656.9 INT (R band) photometry
j0906g.dat 39 179 SDSS J090628.24+052656.9 INT (g band) photometry
j0924b.dat 39 256 SDSS J092444.48+080150.9 NTT (B band) photometry
j0924v.dat 39 75 SDSS J092444.48+080150.9 WHT (V band) photometry
j1152v.dat 39 562 SDSS J115207.00+404947.8 WHT (V band) photometry
j1524v.dat 39 756 SDSS J152419.33+220920.1 WHT (V band) photometry
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See also:
J/MNRAS/373/687 : Spectra of 5 faint cataclysmic variables (Southworth+, 2006)
J/A+A/507/929 : Light curves of SDSS J100658.40+233724.4 (Southworth+, 2009)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- SDSS Star name (JHHMMSS.ss+DDMMSS.s)
27- 28 I2 h RAh Right ascension (J2000)
30- 31 I2 min RAm Right ascension (J2000)
33- 37 F5.2 s RAs Right ascension (J2000)
39 A1 --- DE- Declination sign (J2000)
40- 41 I2 deg DEd Declination (J2000)
43- 44 I2 arcmin DEm Declination (J2000)
46- 49 F4.1 arcsec DEs Declination (J2000)
51- 60 F10.8 d Period ? Orbital period
62- 71 A10 --- File.B Name of B light curve file
73- 82 A10 --- File.V Name of V light curve file
84- 93 A10 --- File.g Name of g light curve file
95-104 A10 --- File.r Name of r light curve file
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Byte-by-byte Description of file: j*.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d HJD Heliocentric Julian date for the midpoint of each
observation
18- 27 F10.7 mag mag Apparent magnitude of the target star
31- 39 F9.7 mag e_mag Measurement error of the apparent magnitude
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Acknowledgements:
John Southworth, jkt(at)astro.keele.ac.uk
(End) John Southworth [Keele Univ., UK], Patricia Vannier [CDS] 23-Feb-2010