High-resolution Keck I spectroscopy of Galactic halo post-asymptotic giant branch stars

Details High-resolution Keck I spectroscopy of Galactic halo post-asymptotic giant branch stars High-resolution Keck I spectroscopy of Galactic halo post-asymptotic giant branch stars

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.337..851m&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 337, Issue 3, pp. 851-860.

Astronomy and Astrophysics

Astronomy

12

Stars: Abundances, Stars: Agb And Post-Agb, Stars: Early-Type, Stars: Population Ii

Scientific paper

Absolute and differential abundance analyses have been performed from high-resolution, high signal-to-noise ratio optical (Keck I) spectra for three evolved Galactic halo stars, namely PG 1704 + 222, HD 341617 and LS IV -04 01. Their derived atmospheric parameters indicate that all three objects are undergoing a post-asymptotic giant branch (post-AGB) phase of evolution. A differential abundance analysis reveals HD 341617 as having a mild carbon deficiency of 0.74 dex, possibly due to the star having evolved off the AGB before the onset of the third dredge-up. Although such carbon underabundances are typical of hot post-AGB objects, the same trend is not observed in PG 1704 + 222, where the carbon abundance is found to be consistent with those derived for nitrogen and oxygen. Hence, a dredge-up scenario need not be invoked to explain the chemical composition of PG 1704 + 222. For LS IV -04 01 no iron deficiency is apparent relative to magnesium and silicon, and hence a gas-dust separation event in the AGB progenitor need not be invoked for this star.

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