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HD 7212


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Light variations of massive stars (Alpha Cygni variables). IX
High-precision VBLUW photometry of 22 highly luminous OBA-type stars, 13of which are Alpha Cygni variables and two of which are variable only incolor, is presented. It is suggested that sigma (V-B) increases fasterthan sigma (B-L) with later spectral types due to the absence ofstochastic metal line strength variations in the V band. It is assumedthat short-time-scale stellar spot activity is present, or thattemperature and density waves move through the atmospheres with the sametime scales, producing these line strength variations independent of thecontinuum variations. The possibility of differentiating stars which lieclose to each other in the HR diagram but have different evolutionaryhistories (and thus different metal abundances) with the aid of themaximum light amplitude/sigma (V-B) diagram is considered.

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Observation and Astrometry data

Constellation:Toucan
Right ascension:01h11m18.75s
Declination:-59°12'00.3"
Apparent magnitude:8.394
Distance:307.692 parsecs
Proper motion RA:21.3
Proper motion Dec:7.6
B-T magnitude:9.536
V-T magnitude:8.489

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 7212
TYCHO-2 2000TYC 8480-577-1
USNO-A2.0USNO-A2 0300-00354362
HIPHIP 5561

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