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Title: Chemical composition of evolved stars of high galactic latitude
Authors: Giridhar, S
Arellano Ferro, A
Keywords: 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
Issue Date: Nov-2005
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, Vol. 443, No. 1, pp. 297 - 308
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.
ISSN: 0004-6361
Appears in Collections:IIAP Publications

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