Spectroscopy of Post-AGB Candidate HD 331319 (IRAS 19475+3119)

Bibcode
2001ASSL..265..301S
Sivarani, T.; Parthasarathy, M.; García-Lario, P.; Manchado, A.
Referencia bibliográfica

Post-AGB Objects as a Phase of Stellar Evolution, Proceedings of the Toruń Workshop held July 5-7, 2000. Edited by R. Szczerba and S. K. Górny. Astrophysics and Space Science Library Vol. 265, ISBN 07923-71453. Publisher: Kluwer Academic Publishers, Boston/Dordrecht/London, 2001.

Fecha de publicación:
8
2001
Número de autores
4
Número de autores del IAC
1
Número de citas
2
Número de citas referidas
2
Descripción
HD 331319 is a F3 Ib star with a detached cold circumstellar dust shell with far-IR colours similar to planetary nebulae. From an analysis of high resolution spectra using LTE stellar atmospheric models, we have derived the atmospheric parameters and the chemical composition of HD 331319. By matching the theoretical and the observed spectrum we obtained Teff = 7500K, log g = 0.5 and xit = 7 kms-1 and estimated [C/Fe] = 0.4 +/- 0.3, [N/Fe] = 1.4 +/- 0.5, [O/H] = 0.3 +/- 0.3, [Fe/H] = -0.2 +/- 0.3 We find that nitrogen is overabundant, oxygen and iron are nearly solar. The total C,N,O abundances with respect to iron indicate mixing due to the third dredge-up.
Tipo
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