Study of the IR-excess supergiant HD 331319

被引：4

作者：

Arkhipova, V. P. ^{[1
]}

Ikonnikova, N. P. ^{[1
]}

Komissarova, G. V. ^{[1
]}

Esipov, V. F. ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia

来源：

ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 2006年 / 32卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

post-AGB supergiants; photometric and spectroscopic observations; photometric variability;

D O I：

10.1134/S1063773706010075

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of brightness variability in the IR-excess early F supergiant HD 331319, a candidate post-AGBstar. Over three years of systematic UBV observations, the star showed low-amplitude (up to 0(.)(m) 17 in V) quasi-periodic brightness variations on a time scale of similar to 45 days. A preliminary analysis of our photometry indicates that HD 331319 and other typical post-AGBF supergiants have a similar pattern of variability. A study of the extinction toward HD 331319 leads us to conclude that the fraction of the circumstellar extinction is small for this star. We present low-resolution spectroscopy for HD 331319 and discuss the spectral classification of post-AGB F supergiants using HD 331319, HD 161796, HD 187885, and HD 56126 as examples.

引用

页码：45 / 53

页数：9

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