J/A+A/507/929 Light curves of SDSS J100658.40+233724.4 (Southworth+, 2009)
Orbital periods of cataclysmic variables identified by the SDSS.
VI. The 4.5-hr period eclipsing system SDSS J100658.40+233724.
Southworth J., Hickman R.D.G., Marsh T.R., Rebassa-Mansergas A.,
Gansicke B.T., Copperwheat C.M., Rodriguez-Gil P.
<Astron. Astrophys. 507, 929 (2009)>
=2009A&A...507..929S 2009A&A...507..929S
ADC_Keywords: Binaries, cataclysmic ; Photometry, CCD ; Spectroscopy
Keywords: stars: dwarf novae - stars: novae, cataclysmic variables -
stars: binaries: eclipsing - stars: binaries: spectroscopic -
stars: white dwarfs - stars: individual: SDSS J100658.40+233724
Abstract:
We present time-resolved spectroscopy and photometry of SDSS
J100658.40+233724.4, which we have discovered to be an eclipsing
cataclysmic variable with an orbital period of 0.18591324 days
(267.71507min). The observed velocity amplitude of the secondary star
is 276±7km/s, which an irradiation correction reduces to
258±12km/s. Doppler tomography of emission lines from the infrared
calcium triplet supports this measurement. We have modelled the light
curve using the LCURVE code and Markov Chain Monte Carlo simulations,
finding a mass ratio of 0.51±0.08. From the velocity amplitude and
the light curve analysis we find the mass of the white dwarf to be
0.78±0.12M☉ and the masses and radii of the secondary star to
be 0.40±0.10M☉ and 0.466±0.036R☉, respectively. The
secondary component is less dense than a normal main sequence star but
its properties are in good agreement with the expected values for a CV
of this orbital period. By modelling the spectral energy distribution
of the system we find a distance of 676±40pc and estimate a white
dwarf effective temperature of 16500±2000K.
Description:
We present the discovery and follow-up observations of eclipses of the
cataclysmic variable star SDSS J100658.40+233724.4, fom which we
determine the orbital period and the masses and radii of the two
stellar components. Time-resolved optical spectroscopic observations
covering the full orbital period were obtained on three consecutive
nights. Time-resolved photometry of four eclipses was obtained between
2008 February and December.
Objects:
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RA (2000) DE Designation(s)
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10 06 58.4 +23 37 24 SDSS J100658.40+233724.4 = SDSS J100658.41+233724.4
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
caha.dat 29 784 White-light photometry from Calar Alto 2.2m
not.dat 29 559 Wide-V-filter photometry from the NOT 2.5m
obs.dat 34 157 Spectroscopic observations
sp/* . 157 FITS files of red and blue spectra
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See also:
http://www.sdss.org : SDSS Home Page
J/MNRAS/373/687 : Spectra of 5 faint cataclysmic variables (Southworth+, 2006)
Byte-by-byte Description of file: caha.dat not.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentric Julian Date of exposure midpoint
17- 22 F6.3 mag mag Apparent magnitude of SDSS J100658.40+233724.4
25- 29 F5.3 mag e_mag Measurement error in apparent magnitude
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Byte-by-byte Description of file: obs.dat
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Bytes Format Units Label Explanations
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1- 17 F17.9 d HJD Heliocentric Julian Date of observation
19- 22 A4 --- Band [red blue] Red or blue
24- 34 A11 --- FileName Name of the fits file in sp subdirectory
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Acknowledgements:
John Southworth, jkt(at)astro.keele.ac.uk
References:
Southworth et al., Paper I 2006MNRAS.373..687S 2006MNRAS.373..687S, Cat. J/MNRAS/373/687
Southworth et al., Paper II 2007MNRAS.382.1145S 2007MNRAS.382.1145S
Dillon et al., Paper III 2008MNRAS.386.1568D 2008MNRAS.386.1568D
Southworth et al., Paper IV 2008MNRAS.388..709S 2008MNRAS.388..709S
Southworth et al., Paper V 2008MNRAS.391..591S 2008MNRAS.391..591S
(End) John Southworth [Warwick, UK], Patricia Vannier [CDS] 18-Sep-2009