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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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 24 A19 --- SDSS Star name ( 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
Byte-by-byte Description of file: j*.dat
Bytes Format Units Label Explanations
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
Acknowledgements: John Southworth, jkt(at)
(End) John Southworth [Keele Univ., UK], Patricia Vannier [CDS] 23-Feb-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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