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Issue A&A
Volume 443, Number 1, November III 2005
Page(s) 297 - 308
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20041495



A&A 443, 297-308 (2005)
DOI: 10.1051/0004-6361:20041495

Chemical composition of evolved stars of high galactic latitude

Sunetra Giridhar1 and A. Arellano Ferro2

1  Indian Institute of Astrophysics, Bangalore 560034, India
    e-mail: giridhar@iiap.ernet.in
2  Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70-264, D.F. CP 04510, México
    e-mail: armando@astroscu.unam.mx

(Received 19 June 2004 / Accepted 11 July 2005)

Abstract
We have carried out abundance analysis for a sample of high galactic latitude supergiants in search of evolved stars. We find that HD 27381 has atmospheric parameters and an abundance pattern very similar to that of the post-AGB star HD 107369. HD 10285 and HD 25291 are moderately metal-poor and show the influence of mixing that has brought the products of NeNa cycle to the surface. The high galactic latitude B supergiant HD 137569 shows selective depletion of refractory elements normally seen in post-AGB stars. We find that the high velocity B type star HD 172324 shows moderate deficiency of Fe group elements but the CNO abundances are very similar to that of disk B supergiants. The observed variations in the radial velocities, transient appearance of emission components in hydrogen line profiles and doubling of O I lines at 7774 Å  support the possibility of this star being a pulsating variable or a binary star.


Key words: stars: AGB and post-AGB -- stars: chemically peculiar -- stars: abundances -- stars: individual HD 10132, HD 10285, HD 12533, HD 25291, HD 27381, HD 137569, HD 159251, HD 172324

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© ESO 2005


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