Variable star in the constellation Andromeda
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | Variable type
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W Andromedae is a variable star in the constellation of Andromeda. It is classified as a Mira variable and S-type star, and varies from an apparent visual magnitude of 14.6 at minimum brightness to a magnitude of 6.7 at maximum brightness, with a period of approximately 397.3 days.
W Andromedae was discovered by Thomas David Anderson in 1899.
W Andromedae is an S-type AGB star, in the process of expelling its red giant envelope into space. Line emission from the 115 GHz rotational transition of carbon monoxide was detected in 1986 by Benjamin Zuckerman "et al." The width of the emission line indicated that the star is surrounded by a circumstellar envelope expanding at 11 km/sec. The star is losing mass due to stellar winds at a rate of 2.79×10-7 M☉/yr.
References.
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