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AE Andromedae
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AE Andromedae : ウィキペディア英語版
AE Andromedae


AE Andromedae (AE And) is a luminous blue variable (LBV), a type of variable star. The star is one of the most luminous variables in M31, the Andromeda Galaxy.
==Discovery==
The star was discovered to be variable in 1928, with a photographic magnitude range of 14.7-15.6, at the Harvard College Observatory and designated HV 4476. A year later it was given the variable star designation AE Andromedae. At that time it was the brightest stellar object in M31 and maintained a similar brightness for about 20 years.〔
Early in the investigations leading to the definition of LBVs, AE And was identified as similar to the five Hubble-Sandage variables: Var A, Var B, Var C, and Var 2 in M33, and Var 19 in M31 (=AF Andromedae). On the basis of color-color comparisons it was assigned as spectral type B and described as related to the P Cygni variables. Observations from 1960 to 1970 show irregular variations in the B (blue) magnitude between 16.2 and 17.6, with very similar V magnitudes, and U magnitudes around 0.4 brighter.〔 The first detailed spectrum was published in 1975.〔

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