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HD 331319: A post-AGB F supergiant with He I lines

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Abstract

Based on CCD spectra taken with an echelle spectrometer attached to the 6-m telescope, we have determined for the first time the fundamental parameters and detailed chemical composition of HD 331319, an optical counterpart of the infrared source IRAS 19475+3119, by the model-atmosphere method. Helium lines were detected in the spectrum of this luminous (Mυ<−8m object with the effective temperature T eff=7200 K. This detection can be interpreted as a significant helium overabundance in the observed atmospheric layers and may be considered as a manifestation of helium synthesis during the preceding evolution. Nitrogen and oxygen were found to be overabundant, [N/Fe]⊙=+1.30 dex and [O/Fe]⊙=+0.64 dex, with the carbon overabundance being modest. The metallicity of the stellar atmosphere, [Fe/H]⊙=+0.25, differs only slightly from its solar value. The s-process metals are not overabundant but most likely underabundant relative to iron: [X/Fe]⊙=−0.68 for Y and Zr. Barium is also underabundant relative to iron: [Ba/Fe]⊙=−0.47. The heavier elements La, Ce, Nd, and Eu are slightly enhanced relative to iron: the mean [X/Fe]⊙=−0.16 for them. In general, the elemental abundances confirm that IRAS 19475+3119 is a post-AGB object. The metallicity in combination with the radial velocity Vr=−3.4 km s−1 and Galactic latitude \(\left| b \right| = 2_.^ \circ 7\) of the object suggest that it belongs to the Galactic disk population. The envelope expansion velocity, V exp≈21 km s−1, was determined from the positions of the absorption bands that originate in the circumstellar envelope. A comparison of our results for the comparison star HD 161796=IRAS 17436+5003, a typical post-AGB object, with previously published data revealed an evolutionary increase in the effective temperature of HD 161796 at a mean rate of ≥50° per year.

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  1. Special Astrophysical Observatory, Russian Academy of Sciencest, Nizhnii Arkhyz, Stavropolskii krai, 357147, Russia

    V. G. Klochkova, V. E. Panchuk & N. S. Tavolzhanskaya

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  1. V. G. Klochkova
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  2. V. E. Panchuk
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  3. N. S. Tavolzhanskaya
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__________

Translated from Pis'ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 28, No. 1, 2002, pp. 56–70.

Original Russian Text Copyright © 2002 by Klochkova, Panchuk, Tavolzhanskaya.

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Klochkova, V.G., Panchuk, V.E. & Tavolzhanskaya, N.S. HD 331319: A post-AGB F supergiant with He I lines. Astron. Lett. 28, 49–62 (2002). https://doi.org/10.1134/1.1434453

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