Pavlovski, K., Tamajo, E., Koubsky, P., Southworth, J. (John), Yang, S. and Kolbas, V.. (2009) Chemical evolution of high-mass stars in close binaries - II. The evolved component of the eclipsing binary V380 Cygni. Monthly Notices of the Royal Astronomical Society, Vol.400 (No.2). pp. 791-804. ISSN 0035-8711

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Abstract

The eclipsing and double-lined spectroscopic binary V380 Cyg is an extremely important probe of stellar evolution: its primary component is a high-mass star at the brink of leaving the main sequence whereas the secondary star is still in the early part of its main sequence lifetime. We present extensive high-resolution echelle and grating spectroscopy from Ondrejov, Calar Alto, Victoria and La Palma. We apply spectral disentangling to unveil the individual spectra of the two stars and obtain new spectroscopic elements. The secondary star contributes only about 6 per cent of the total light, which remains the main limitation to measuring the system's characteristics. We determine improved physical properties, finding masses 13.1 +/- 0.3 and 7.8 +/- 0.1 M-circle dot, radii 16.2 +/- 0.3 and 4.06 +/- 0.08 R-circle dot, and effective temperatures 21 750 +/- 280 and 21 600 +/- 550 K, for the primary and secondary components, respectively. We perform a detailed abundance analysis by fitting non-local thermodynamic equilibrium (LTE) theoretical line profiles to the disentangled spectrum of the evolved primary star, and reveal an elemental abundance pattern reminiscent of a typical nearby B star. Contrary to the predictions of recent theoretical evolution models with rotational mixing, no trace of abundance modifications due to the CNO cycle are detected. No match can be found between the predictions of these models and the properties of the primary star: a mass discrepancy of 1.5 M-circle dot exists and remains unexplained.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley-Blackwell Publishing, Inc.
ISSN:	0035-8711
Date:	1 December 2009
Volume:	Vol.400
Number:	No.2
Number of Pages:	14
Page Range:	pp. 791-804
Identification Number:	10.1111/j.1365-2966.2009.15479.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Croatian Ministery of Science and Education, Science and Technology Facilities Council (Great Britain) (STFC), European Space Agency (ESA) PECS project No. 98058
Grant number:	ST/F002599/1
URI:	http://wrap.warwick.ac.uk/id/eprint/16972

Data sourced from Thomson Reuters' Web of Knowledge

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