Omega Andromedae
binary star system in the constellation Andromeda
Omega Andromedae (ω And, ω Andromedae) is a binary star system in the northern constellation of Andromeda. Parallax measurements made during the Gaia mission make this system to be approximately 93.9 light-years (28.8 parsecs) from Earth. Its apparent visual magnitude is +4.83, which makes it bright enough to be seen with the naked eye.
The primary component has a stellar classification of F5 IVe. The IV luminosity class indicates that it is probably a subgiant star that is in the process of evolving away from the main sequence as the supply of hydrogen at its core depletes. However, Abt (1985) gives a classification of F3 V, suggesting it is an F-type main-sequence star. The measured angular diameter of the primary star is 0.70 ± 0.03 mas. At the system's estimated distance this yields a size of about 2.2 times that of the Sun. It is emitting about seven times solar luminosity from its outer atmosphere at an effective temperature of 6,628 K. This heat gives it the yellow-white-hued glow of an F-type star.
In 2008, the companion star was resolved using adaptive optics at the Lick Observatory.
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This entry incorporates text from “Omega Andromedae” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.