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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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观测天体数据

星座:杜鵑座
右阿森松:01h11m18.75s
赤纬:-59°12'00.3"
视星:8.394
距离:307.692 天文距离
右阿森松适当运动:21.3
赤纬适当运动:7.6
B-T magnitude:9.536
V-T magnitude:8.489

目录:
适当名称
HD 1989HD 7212
TYCHO-2 2000TYC 8480-577-1
USNO-A2.0USNO-A2 0300-00354362
HIPHIP 5561

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