An analysis of the optical spectra of the post-asymptotic giant branch stars LSIV-12111 and HD 341617

R. S I Ryans, P. L. Dufton, C. J. Mooney, W. R J Rolleston, F. P. Keenan, Ivan - Hubeny, T. Lanz

Research output: Contribution to journalArticle

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Abstract

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 -0.35 dex for LSIV-12 111 and -0.50 dex 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.

Original languageEnglish (US)
Pages (from-to)1119-1129
Number of pages11
JournalAstronomy and Astrophysics
Volume401
Issue number3
StatePublished - Apr 2003

Fingerprint

asymptotic giant branch stars
optical spectrum
line spectra
emission spectra
atmospheres
atmosphere
local thermodynamic equilibrium
estimates
stellar mass
spectral resolution
chemical composition
absorption spectra
plasma
stars
high resolution
metal
metals
parameter
analysis

Keywords

  • Stars: abundances
  • Stars: early-type
  • Stars: fundamental parameters
  • Stars: supergiants

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Ryans, R. S. I., Dufton, P. L., Mooney, C. J., Rolleston, W. R. J., Keenan, F. P., Hubeny, I. ., & Lanz, T. (2003). An analysis of the optical spectra of the post-asymptotic giant branch stars LSIV-12111 and HD 341617. Astronomy and Astrophysics, 401(3), 1119-1129.

An analysis of the optical spectra of the post-asymptotic giant branch stars LSIV-12111 and HD 341617. / Ryans, R. S I; Dufton, P. L.; Mooney, C. J.; Rolleston, W. R J; Keenan, F. P.; Hubeny, Ivan -; Lanz, T.

In: Astronomy and Astrophysics, Vol. 401, No. 3, 04.2003, p. 1119-1129.

Research output: Contribution to journalArticle

Ryans, RSI, Dufton, PL, Mooney, CJ, Rolleston, WRJ, Keenan, FP, Hubeny, I & Lanz, T 2003, 'An analysis of the optical spectra of the post-asymptotic giant branch stars LSIV-12111 and HD 341617', Astronomy and Astrophysics, vol. 401, no. 3, pp. 1119-1129.
Ryans RSI, Dufton PL, Mooney CJ, Rolleston WRJ, Keenan FP, Hubeny I et al. An analysis of the optical spectra of the post-asymptotic giant branch stars LSIV-12111 and HD 341617. Astronomy and Astrophysics. 2003 Apr;401(3):1119-1129.
Ryans, R. S I ; Dufton, P. L. ; Mooney, C. J. ; Rolleston, W. R J ; Keenan, F. P. ; Hubeny, Ivan - ; Lanz, T. / An analysis of the optical spectra of the post-asymptotic giant branch stars LSIV-12111 and HD 341617. In: Astronomy and Astrophysics. 2003 ; Vol. 401, No. 3. pp. 1119-1129.
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