SIMBAD references

2002MNRAS.337..851M - Mon. Not. R. Astron. Soc., 337, 851-860 (2002/December-2)

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

MOONEY C.J., ROLLESTON W.R.J., KEENAN F.P., DUFTON P.L., SMOKER J.V., RYANS R.S.I. and ALLER L.H.

Abstract (from CDS):

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.

Abstract Copyright: RAS

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: early-type - stars: Population II

Status at CDS:  

Simbad objects: 29

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2002MNRAS.337..851M and select 'bookmark this link' or equivalent in the popup menu


2020.06.01-03:27:42

© Université de Strasbourg/CNRS

    • Contact