Bibcode
Rebassa-Mansergas, A.; Gänsicke, B. T.; Schreiber, M. R.; Southworth, J.; Schwope, A. D.; Nebot Gomez-Moran, A.; Aungwerojwit, A.; Rodríguez-Gil, P.; Karamanavis, V.; Krumpe, M.; Tremou, E.; Schwarz, R.; Staude, A.; Vogel, J.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 390, Issue 4, pp. 1635-1646.
Advertised on:
11
2008
Citations
57
Refereed citations
44
Description
We present follow-up spectroscopy and photometry of 11 post-common
envelope binary (PCEB) candidates identified from multiple Sloan Digital
Sky Survey (SDSS) spectroscopy in an earlier paper. Radial velocity
measurements using the NaIλλ8183.27, 8194.81 absorption
doublet were performed for nine of these systems and provided
measurements of six orbital periods in the range Porb = 2.7-
17.4h. Three PCEB candidates did not show significant radial velocity
variations in the follow-up data, and we discuss the implications for
the use of SDSS spectroscopy alone to identify PCEBs. Differential
photometry confirmed one of our spectroscopic orbital periods and
provided one additional Porb measurement. Binary parameters
are estimated for the seven objects for which we have measured the
orbital period and the radial velocity amplitude of the low-mass
companion star, Ksec. So far, we have published nine SDSS
PCEBs orbital periods, all of them Porb < 1d. We perform
Monte Carlo simulations and show that 3σ SDSS radial velocity
variations should still be detectable for systems in the orbital period
range of Porb ~ 1- 10d. Consequently, our results suggest
that the number of PCEBs decreases considerably for Porb >
1d, and that during the CE phase the orbital energy of the binary star
is may be less efficiently used to expel the envelope than frequently
assumed.
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Binary Stars
The study of binary stars is essential to stellar astrophysics. A large number of stars form and evolve within binary systems. Therefore, their study is fundamental to understand stellar and galactic evolution. Particularly relevant is that binary systems are still the best source of precise stellar mass and radius measurements. Research lines
Pablo
Rodríguez Gil