Sigma Andromedae
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Sigma Andromedae is a single[10] star in the northern constellation of Andromeda. Its Bayer designation is Latinized from σ Andromedae, and abbreviated Sig And or σ And, respectively. The star has an apparent visual magnitude of +4.5,[2] which is bright enough to be seen with the naked eye from most locations. Parallax measurements made during the Gaia mission place it at a distance of about Script error: No such module "convert"..[1] The magnitude of the star is diminished by 0.08 from extinction caused by intervening gas and dust.[11] It is drifting closer to the Sun with a radial velocity of –8 km/s.[2]
This star has a stellar classification of A2 V,[4] which matches the spectrum of an A-type main sequence star. It is about 450 million years old[12] and is spinning rapidly with a projected rotational velocity of 123 km/s.[8] The star has 2.12[3] times the mass of the Sun and 2.13[7] times the Sun's girth. It is radiating 21[7] times the luminosity of the Sun from its photosphere at an effective temperature of 8,929 K,[6] giving it the white-hued glow of an A-type star.[13]
In the past, radial velocity variations have been reported,[14] but this remains unconfirmed.[10] The star does not show any significant photometric variations and is used as an ubvy standard star.[15] A debris disk of warm dust around this star has been detected by Spitzer Space Telescope.[16][17] A model fit to the data yields an orbital distance of Script error: No such module "val". from the host star with a mean temperature of Script error: No such module "val"..[7]
Sigma Andromedae is a candidate for membership in the stream of stars associated with the Ursa Major Moving Group. This is a set of stars that share a common motion through space, which suggests they originated together.[6]
Naming
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Stable, refers to an asterism consisting of σ Andromedae, θ Andromedae, ρ Andromedae and seven other fainter, unidentified stars. Consequently, the Chinese name for σ Andromedae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[18]
References
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- ↑ a b c d e f Template:Cite Gaia EDR3
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- ↑ Template:Cite simbad
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- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 18 日 Template:Webarchive
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