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HD 96709


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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:Ursa Major
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

Catalogs and designations:
Proper Names
HD 1989HD 96709
TYCHO-2 2000TYC 3824-903-1
USNO-A2.0USNO-A2 1425-07613802
HIPHIP 54508

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