Post-common envelope binaries from SDSS - III. Seven new orbital periods
نویسندگان
چکیده
منابع مشابه
Post Common Envelope Binaries from SDSS . I : 101 white dwarf main sequence binaries with multiple SDSS spectroscopy
We present a detailed analysis of 101 white dwarf-main sequence binaries (WDMS) from the Sloan Digital Sky Survey (SDSS) for which multiple SDSS spectra are available. We detect significant radial velocity variations in 18 WDMS, identifying them as post common envelope binaries (PCEBs) or strong PCEB candidates. Strict upper limits to the orbital periods are calculated, ranging from 0.43 to 788...
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We report the discovery of the ninth pre-polar, consisting of a late-type ZAMS secondary and a magnetic white dwarf. The white dwarf accretes at extreme low rate, ˙ M ∼ 10 −14 M ⊙ yr −1 , from the wind of the companion donor star. The source was found in our systematic search for WD/MS binaries within SDSS/SEGUE. Based on seven Sloan-spectra we estimate a binary period of ∼ 200, 230, or 270 min...
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We apply population synthesis techniques to calculate the present day population of post-common envelope binaries (PCEBs) for a range of models describing the common envelope (CE) phase. This includes constant, global values of the CE ejection efficiency parameter αCE = 0.1 to 1.0, as well as considering it as a function of the secondary mass. We also use models where the values of λ (the giant...
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We report the first results of our programme to obtain multi-epoch radial velocity measurements of stars with a strong far-UV excess to identify post common-envelope binaries (PCEBs). The targets have been identified using optical photometry from SDSS DR4, ultraviolet photometry from GALEX GR2 and proper motion information from SDSS DR5. We have obtained spectra at two or more epochs for 36 tar...
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Period or amplitude variations in eclipsing binaries may reveal the presence of additional massive bodies in the system, such as circumbinary planets. Here, we have studied twelve previously-known eclipsing post-common-envelope binaries for evidence of such light curve variations, on the basis of multi-year observations in the SuperWASP archive. The results for HW Vir provided strong evidence f...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2008
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2008.13850.x