Journal Article

Abundance analysis of Am binaries and search for tidally driven abundance anomalies – III. HD 116657, HD 138213, HD 155375, HD 159560, HD 196544 and HD 204188

I. Stateva, I. Kh. Iliev and J. Budaj

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 420, issue 2, pages 1207-1216
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20108.x
Abundance analysis of Am binaries and search for tidally driven abundance anomalies – III. HD 116657, HD 138213, HD 155375, HD 159560, HD 196544 and HD 204188

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We continue here the systematic abundance analysis of a sample of Am binaries in order to search for possible abundance anomalies driven by tidal interaction in these binary systems.

New CCD observations of HD 116657, HD 138213, HD 155375, HD 159560, HD 196544 and HD 204188 were obtained in two spectral regions (6400–6500 and 6660–6760 Å). A synthetic spectrum analysis was carried out and the basic stellar properties, effective temperatures, gravities, projected rotational velocities, masses, ages and abundances of several elements were determined. We conclude that all six stars are Am stars.

These stars were put into the context of other Am binaries with 10 < Porb < 200 d, and their abundance anomalies discussed in the context of possible tidal effects. There is a clear anticorrelation of the Am peculiarities with v sin i. However, there seems also to be a correlation with the eccentricity and perhaps with the orbital period. The dependence on temperature, age, mass and microturbulence was studied as well. The projected rotational velocities obtained by us were compared with those of Royer et al. and Abt & Morrell.

Keywords: diffusion; hydrodynamics; stars: abundances; binaries: close; stars: chemically peculiar

Journal Article.  5703 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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