Rebassa-Mansergas, A., Gänsicke, B. T. (Boris T.), Schreiber, M. R., Southworth, J. (John), Schwope, A. D. (Axel D.), Gomez-Moran, A. Nebot, Aungwerojwit, A. (Amornrat), Rodriguez-Gil, P., Karamanavis, V., Krumpe, M., Tremou, E., Schwarz, R., Staude, A. and Vogel, J.. (2008) Post-common envelope binaries from SDSS - III. Seven new orbital periods. Monthly Notices of the Royal Astronomical Society, Vol.390 (No.4). pp. 1635-1646. ISSN 0035-8711

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Abstract

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 Na I lambda lambda 8183.27, 8194.81 absorption doublet were performed for nine of these systems and provided measurements of six orbital periods in the range P-orb = 2.7 - 17.4 h. 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 P-orb 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, K-sec. So far, we have published nine SDSS PCEBs orbital periods, all of them P-orb < 1 d. We perform Monte Carlo simulations and show that 3 sigma SDSS radial velocity variations should still be detectable for systems in the orbital period range of P-orb similar to 1 - 10 d. Consequently, our results suggest that the number of PCEBs decreases considerably for P-orb > 1 d, 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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	White dwarf stars, Brown dwarf stars, Double stars -- Spectra, Double stars -- Evolution, Asymptotic giant branch stars, Low mass stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley-Blackwell Publishing, Inc
ISSN:	0035-8711
Date:	11 November 2008
Volume:	Vol.390
Number:	No.4
Number of Pages:	12
Page Range:	pp. 1635-1646
Identification Number:	10.1111/j.1365-2966.2008.13850.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Science and Technology Facilities Council (Great Britain), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT), Universidad de Valparaíso. Centro de Astrofísica, Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), Deutsche Forschungsgemeinschaft (DFG), Instituto de Astrofísica de Canarias (IAC)
Grant number:	1061199 (FONDECYT), 35 (DIPUV), 50OR0404 (DLR), Schw536/20-1 (DFG)
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URI:	http://wrap.warwick.ac.uk/id/eprint/29118

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