2009A&A...495..561N


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.23CEST05:34:06

2009A&A...495..561N - Astronomy and Astrophysics, volume 495, 561-569 (2009/2-4)

Post common envelope binaries from SDSS. IV. SDSSJ121258.25-012310.1, a new eclipsing system.

NEBOT GOMEZ-MORAN A., SCHWOPE A.D., SCHREIBER M.R., GAENSICKE B.T., PYRZAS S., SCHWARZ R., SOUTHWORTH J., KOHNERT J., VOGEL J., KRUMPE M. and RODRIGUEZ-GIL P.

Abstract (from CDS):

From optical photometry we show that SDSSJ121258.25-012310.1 is a new eclipsing, post common-envelope binary with an orbital period of 8.06 h and an eclipse length of 23 min. We observed the object over 11 nights in different bands and determined the ephemeris of the eclipse to HJDmid=2454104.7086(2)+0.3358706(5)xE, where numbers in parenthesis indicate the uncertainties in the last digit. The depth of the eclipse is 2.85±0.17mag in the V band, 1.82±0.08mag in the R band and 0.52±0.02mag in the I band. From spectroscopic observations we measured the semi-amplitude of the radial velocity K2=181±3km/s for the secondary star. The stellar and binary parameters of the system were constrained from a) fitting the SDSS composite spectrum of the binary, b) using a K-band luminosty-mass relation for the secondary star, and c) from detailed analyses of the eclipse light curve. The white dwarf has an effective temperature of 17700±300K, and its surface gravity is logg=7.53±0.2. We estimate that the spectral type of the red dwarf is M4±1 and the distance to the system is 230±20parsec. The mass of the secondary star is estimated to be in the range Msec=0.26-0.29M, while the mass of the white dwarf is most likely Mwd=0.46-0.48M. From an empirical mass-radius relation we estimate the radius of the red dwarf to be in the range 0.28-0.31R, whereas we get Rwd=0.016-0.018R from a theoretical mass-radius realation. Finally we discuss the spectral energy distribution and the likely evolutionary state of SDSS1212-0123.

Abstract Copyright:

Journal keyword(s): binaries: close - binaries: eclipsing - novae, cataclysmic variables

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 G 76-62 PM* 03 09 00.1671993558 +10 01 25.653337980   16.57 14.86 14.677   M5.04 36 0
2 CD-32 5613 WD* 08 41 32.4293043356 -32 56 32.916852010   12.07 11.85 12.3   DA5.5 275 0
3 SDSS J121258.25-012310.1 ** 12 12 58.2524209402 -01 23 10.195304974           DA+dMe 36 0
4 2MASS J12130239-0123434 * 12 13 02.3984843019 -01 23 43.556358690           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2021.04.23-05:34:06

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