Study of the IR-excess supergiant HD 331319 |
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Authors: | V P Arkhipova N P Ikonnikova G V Komissarova V F Esipov |
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Institution: | (1) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia |
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Abstract: | We report the discovery of brightness variability in the IR-excess early F supergiant HD 331319, a candidate post-AGB star.
Over three years of systematic U BV observations, the star showed low-amplitude (up to
in V) quasi-periodic brightness variations on a time scale of ∼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. |
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