SIMBAD references

2006MNRAS.368.1749T - Mon. Not. R. Astron. Soc., 368, 1749-1756 (2006/June-1)

A non-LTE abundance analysis of the post-AGB star ROA5701.

THOMPSON H.M.A., KEENAN F.P., DUFTON P.L., RYANS R.S.I. and SMOKER J.V.

Abstract (from CDS):

An analysis of high-resolution Anglo-Australian Telescope (AAT)/University College London Échelle Spectrograph (UCLÉS) optical spectra for the ultraviolet (UV)-bright star ROA5701 in the globular cluster ω Cen (NGC5139) is performed, using non-local thermodynamic equilibrium (non-LTE) model atmospheres to estimate stellar atmospheric parameters and chemical composition. Abundances are derived for C, N, O, Mg, Si and S, and compared with those found previously by Moehler et al. We find a general metal underabundance relative to young B-type stars, consistent with the average metallicity of the cluster. Our results indicate that ROA5701 has not undergone a gas-dust separation scenario as previously suggested. However, its abundance pattern does imply that ROA5701 has evolved off the asymptotic giant branch (AGB) prior to the onset of the third dredge-up.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: early-type - stars: individual: Cl* NGC 5139 WOR 1957 - globular clusters: individual: NGC5139

Status at CDS:  

Simbad objects: 20

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2020.06.06-04:26:02

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