期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 419, 期 1, 页码 817-826出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2011.19746.x
关键词
binaries: close; binaries: eclipsing; stars: fundamental parameters; stars: individual: SDSS 121010; 1+334722.9; stars: late-type; white dwarfs
资金
- STFC
- FONDECYT [1100782, 3110049]
- Gemini/CONICYT [32100026]
- UK Science and Technology Facilities Council
- Science and Technology Facilities Council [ST/G009465/1, ST/I001719/1, ST/I005773/1, ST/J001465/1] Funding Source: researchfish
- STFC [ST/I005773/1, ST/J001465/1, ST/G009465/1, ST/I001719/1] Funding Source: UKRI
We identify SDSS J121010.1+334722.9 as an eclipsing post-common-envelope binary, with an orbital period of P-orb = 2.988h, containing a very cool, low-mass, DAZ white dwarf and a low-mass main-sequence star of spectral type M5. A model atmosphere analysis of the metal absorption lines detected in the blue part of the optical spectrum, along with the Galaxy Evolution Explorer near-ultraviolet flux, yields a white dwarf temperature of T-eff,T-WD = 6000 +/- 200 K and a metallicity value of log [Z/H] = -2.0 +/- 0.3. The Na I lambda lambda 8183.27, 8194.81 absorption doublet is used to measure the radial velocity of the secondary star, K-sec = 251.7 +/- 2.0 km s(-1), and Fe I absorption lines in the blue part of the spectrum provide the radial velocity of the white dwarf, K-WD = 95.3 +/- 2.1 km s(-1), yielding a mass ratio of q = 0.379 +/- 0.009. Light-curve model fitting, using the Markov chain Monte Carlo method, gives the inclination angle as i = (79.degrees 05-79.degrees 36) +/- 0.degrees 15, and the stellar masses as M-WD = 0.415 +/- 0.010 M-circle dot and M-sec = 0.158 +/- 0.006 M-circle dot. Systematic uncertainties in the absolute calibration of the photometric data influence the determination of the stellar radii. The radius of the white dwarf is found to be R-WD = (0.0157-0.0161) +/- 0.0003 R-circle dot and the volume-averaged radius of the tidally distorted secondary is R-sec,R- (vol.aver.) = (0.197-0.203) +/- 0.003 R-circle dot. The white dwarf in SDSS J121010.1+334722.9 is a very strong He-core candidate.
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