Study of the IR-excess supergiant HD 331319

Details Study of the IR-excess supergiant HD 331319 Study of the IR-excess supergiant HD 331319

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006astl...32...45a&link_type=abstract

Astronomy Letters, vol. 32, Issue 1, p.45-53

Astronomy and Astrophysics

Astronomy

1

Pacs Numbers 90.97.30.-B - 90.97.60.-S

Scientific paper

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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