SIMBAD references

2003A&A...401.1119R - Astronomy and Astrophysics, volume 401, 1119-1129 (2003/4-3)

An analysis of the optical spectra of the post-asymptotic giant branch stars LSIV-12111 and HD341617.

RYANS R.S.I., DUFTON P.L., MOONEY C.J., ROLLESTON W.R.J., KEENAN F.P., HUBENY I. and LANZ T.

Abstract (from CDS):

High spectral resolution and signal-to-noise observations of the absorption and emission line spectra in two post-asymptotic-giant-branch (PAGB) stellar candidates, LSIV-12111 and HD 314617 are discussed. The absorption line spectra have been analysed using non-LTE model atmosphere techniques to determine stellar atmospheric parameters and chemical compositions, both in absolute terms and relative to a standard star, HD 13841. The atmospheric parameters differ from previous estimates based on LTE model atmospheres, probably due to non-LTE effects. In turn these imply stellar masses that are generally larger than have been previously estimated. Both PAGB candidates have relative uniform underabundances of metals with mean values of -0.35dex for LSIV-12111 and -0.50dex for HD 314617. Furthermore, their abundance patterns are remarkably similar to that observed for optically bright, F-type PAGBs. From the emission spectra, the plasma parameters and angular size of the circumstellar material are constrained, and these are consistent with previous estimates and with a PAGB evolutionary stage.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: supergiants - stars: early-type - stars: fundamental parameters

Simbad objects: 25

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2021.02.24-22:09:38

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