Chemical evolution of high-mass stars in close binaries. I. The eclipsing binary V453 Cygni

Abstract

The eclipsing and double-lined spectroscopic binary system V453 Cygni consists of two early B-type stars, one of which is nearing the terminal age main sequence and one which is roughly halfway through its main sequence lifetime. Accurate measurements of the masses and radii of the two stars are available, which makes a detailed abundance analysis both more interesting and more precise than for isolated stars. We have reconstructed the spectra of the individual components of V453 Cyg from the observed composite spectra using the technique of spectral disentangling. From these disentangled spectra we have obtained improved effective temperature measurements of 27900 +/- 400 K and 26200 +/- 500 K, for the primary and secondary stars respectively, by fitting non-LTE theoretical line profiles to the hydrogen Balmer lines. Armed with these high-precision effective temperatures and the accurately known surface gravities of the stars we have obtained the abundances of helium and metallic elements. A detailed abundance analysis of the primary star shows a normal (solar) helium abundance if the microturbulence velocity derived from metallic lines is used. The elemental abundances show no indication that CNO-processed material is present in the photosphere of this high-mass terminal age main sequence star. The elemental abundances of the secondary star were derived by differential study against a template spectrum of a star with similar characteristics. Both the primary and secondary components display elemental abundances which are in the ranges observed in the Galactic OB stars.

10 pages; accepted for publication in MNRAS

References in corpus (21)

• Theoretical isochrones in several photometric systems I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey filter sets
• The evolution of rotating stars
• Presupernova Evolution of Rotating Massive Stars II: -- Evolution of the Surface Properties
• Eclipsing binaries in open clusters. II. V453 Cyg in NGC 6871
• The VLT-FLAMES survey of massive stars: rotation and nitrogen enrichment as the key to understanding massive star evolution
• The VLT-FLAMES survey of massive stars: Evolution of surface N abundances and effective temperature scales in the Galaxy and Magellanic Clouds
• The VLT-FLAMES Survey of Massive Stars: Observations in the Galactic Clusters NGC 3293, NGC 4755 and NGC 6611
• Eclipsing binaries as standard candles: HD 23642 and the distance to the Pleiades
• The Distance to the Large Magellanic Cloud from the Eclipsing Binary HV2274
• Eclipsing binaries in open clusters. III. V621 Per in chi Persei
• First Determination of the Distance and Fundamental Properties of an Eclipsing Binary in The Andromeda Galaxy
• Abundance analysis of prime B-type targets for asteroseismology I. Nitrogen excess in slowly-rotating beta Cephei stars
• Nitrogen enrichment, boron depletion and magnetic fields in slowly-rotating B-type dwarfs
• Eclipsing binaries observed with the WIRE satellite. II. beta Aurigae and non-linear limb darkening in light curves
• Eclipsing binaries in open clusters. I. V615 Per and V618 Per in h Per
• Carbon abundances of early B-type stars in the solar vicinity. Non-LTE line-formation for C II/III/IV and self-consistent atmospheric parameters
• Stellar Rotation in Young Clusters. II. Evolution of Stellar Rotation and Surface Helium Abundance
• Abundances from disentangled component spectra: the eclipsing binary V578 Mon
• Absolute dimensions of eclipsing binaries. XXIV. The Be star system DW Carinae, a member of the open cluster Collinder 228
• Boron Abundances in Main Sequence B-type Stars: A Test of Rotational Depletion during Main Sequence Evolution
• Surface abundances of light elements for a large sample of early B-type stars - IV. The magnesium abundance in 52 stars - a test of metallicity

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• High-mass eclipsing binaries: a testbed for models of interior structure and evolution -- Accurate fundamental properties and surface chemical composition for V1034 Sco, GL Car, V573 Car and V346 Cen
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• Modelling early-type stars in eclipsing binaries of open clusters: a new method for age determination from ratio of radii
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• Quantitative spectroscopy of multiple OB stars: I. The quadruple system HD 37061 at the centre of Messier 43
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