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Study of the IR-excess supergiant HD 331319
We report the discovery of brightness variability in the IR-excess earlyF supergiant HD 331319, a candidate post-AGB star. Over three years ofsystematic U BV observations, the star showed low-amplitude (up to in V)quasi-periodic brightness variations on a time scale of 45 days. Apreliminary analysis of our photometry indicates that HD 331319 andother typical post-AGBF supergiants have a similar pattern ofvariability. A study of the extinction toward HD 331319 leads us toconclude that the fraction of the circumstellar extinction is small forthis star. We present low-resolution spectroscopy for HD 331319 anddiscuss the spectral classification of post-AGB F supergiants using HD331319, HD 161796, HD 187885, and HD 56126 as examples.
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Observation and Astrometry data
| Constellation: | Großer Bär |
| Right ascension: | 11h09m07.34s |
| Declination: | +53°40'31.9" |
| Apparent magnitude: | 8.888 |
| Distance: | 76.805 parsecs |
| Proper motion RA: | -120.5 |
| Proper motion Dec: | -80.4 |
| B-T magnitude: | 9.641 |
| V-T magnitude: | 8.951 |
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