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Chemical composition of evolved stars of high galactic latitude
We have carried out abundance analysis for a sample of high galacticlatitude supergiants in search of evolved stars.We find that HD 27381 has atmospheric parameters and an abundancepatternvery similar to that of the post-AGB star HD 107369.HD 10285 and HD 25291 are moderately metal-poor andshow the influence of mixing that has brought the productsof NeNa cycle to the surface.The high galactic latitude B supergiant HD 137569 shows selectivedepletion of refractory elements normally seen in post-AGB stars.We find that the high velocity B typestar HD 172324 shows moderate deficiency of Fe group elements butthe CNO abundances are verysimilar to that of disk B supergiants. The observed variations inthe radial velocities, transient appearance of emission componentsin hydrogen line profiles and doublingof O I lines at 7774 Å support the possibility of this star beinga pulsating variable or a binary star.
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Observation and Astrometry data
| Constellation: | Ανδρομέδα |
| Right ascension: | 01h39m58.15s |
| Declination: | +41°40'00.3" |
| Apparent magnitude: | 6.852 |
| Distance: | 173.913 parsecs |
| Proper motion RA: | 42.1 |
| Proper motion Dec: | -1.9 |
| B-T magnitude: | 8.004 |
| V-T magnitude: | 6.948 |
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