Journal Article

Chemical composition of A–F type post-AGB candidates

Sunetra Giridhar, R. Molina, A. Arellano Ferro and G. Selvakumar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 1, pages 290-306
Published in print July 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2010.16696.x
Chemical composition of A–F type post-AGB candidates

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An abundance analysis has been conducted for a sample of nine post-asymptotic giant branch (AGB) candidate stars; eight of them have not been explored before. We find four very promising objects like HD 105262, HD 53300 and CpD-62° 5428 among them. We find strong evidence of dust–gas separation through selective depletion of refractive elements in HD 105262. The same effect is also observed in HD 53300, CpD-62° 5428 and HD 114855 although abundance peculiarities are relatively smaller for the last two stars. We find strong enrichment of nitrogen for HD 725, HD 842, HD 1457, HD 9233 and HD 61227 but no further evidence to support their post-AGB nature. We have compared the observed [N/C] ratios of these stars with the predictions of evolutionary models which include the rotation-induced mixing.

Keywords: stars: abundances; stars: AGB and post-AGB; stars: circumstellar matter

Journal Article.  10384 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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