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The binary properties of the pulsating subdwarf B eclipsing binary PG 1336-018 (NY Virginis)

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Vučković, M., Aerts, Conny, Østensen, R., Nelemans, G., Hu, H. (Haili), Jeffery, C. S. (C. Simon), 1958-, Dhillon, V. S. and Marsh, T. R.. (2007) The binary properties of the pulsating subdwarf B eclipsing binary PG 1336-018 (NY Virginis). Astronomy & Astrophysics, Vol.471 (No.2). pp. 605-615. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20077179

Abstract

Aims. We present an unbiased orbit solution and mass determination of the components of the eclipsing binary PG1336−018 as a critical test for the formation scenarios of subdwarf B stars. Methods. We obtained high-resolution time series VLT/UVES spectra and high-speed multicolour VLT/ULTRACAM photometric observations of PG1336−018, a rapidly pulsating subdwarf B star in a short period eclipsing binary. Results. Combining the radial velocity curve obtained from the VLT/UVES spectra with the VLT/ULTRACAM multicolour lightcurves, we determined numerical orbital solutions for this eclipsing binary. Due to the large number of free parameters and their strong correlations, no unique solution could be found, only families of solutions. We present three solutions of equal statistical significance, two of which are compatible with the primary having gone through a core He-flash and a common-envelope phase described by the α-formalism. These two models have an sdB primary of 0.466 M and 0.389 M, respectively. Finally, we report the detection of the Rossiter-McLaughlin effect for PG1336−018.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Eclipsing binaries, B stars, Pulsating stars
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	August 2007
Volume:	Vol.471
Number:	No.2
Page Range:	pp. 605-615
Identification Number:	10.1051/0004-6361:20077179
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Katholieke Universiteit te Leuven (1970- ), Radboud Universiteit Nijmegen, Particle Physics and Astronomy Research Council (Great Britain) (PPARC)
Grant number:	GOA/2003/04 (Leuven), PPA/G/S/2003/00058 (PPARC), PP/D002370/1 (PPARC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3463