Zeta Pegasi
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Zeta Pegasi or ζ Pegasi, formally named Homam (Template:IPAc-en),[12][13] is a single[14] star in the northern constellation of Pegasus. With an apparent visual magnitude of +3.4,[2] this star is bright enough to be seen with the naked eye and is one of the brighter members of Pegasus. Parallax measurements place it at a distance of around Script error: No such module "convert". from the Sun.[1]
Nomenclature
ζ Pegasi (Latinised to Zeta Pegasi) is the star's Bayer designation.
It bore the traditional name Homam, meaning "Man of High Spirit" or "Lucky Star of High Minded". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalogue and standardize proper names for stars. The WGSN approved the name Homam for this star on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.[13]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Thunder and Lightning, refers to an asterism consisting ζ Pegasi, ξ Pegasi, σ Pegasi, 55 Pegasi, 66 Pegasi and 70 Pegasi.[16] Consequently, the Chinese name for ζ Pegasi itself is Script error: No such module "Lang". (Script error: No such module "Lang".), "the First Star of Thunder and Lightning".[17]
Properties
This star has a stellar classification of B8 V,[3] which identifies it as a large B-type main sequence star that is generating energy through the nuclear fusion of hydrogen at its core. The radius of this star is about four times that of the Sun.[7] In 2007, John H. Goebel showed that Zeta Pegasi is a variable star, using data obtained from Gravity Probe B.[4] It is a slowly pulsating B star that varies slightly in luminosity with a period of Script error: No such module "val". hours, completing 1.04566 cycles per day.[4] Zeta Pegasi is about 120[10] million years old and is rotating rapidly with a projected rotational velocity in the range of 140[9] to 210[10] km/s. The effective temperature of its outer envelope is around Script error: No such module "val".,[7] giving it the characteristic blue-white glow of a B-type star.[18]
Zeta Pegasi has been examined for infrared excess that may indicate the presence of circumstellar matter, but none was found.[19] This star does have two optical companions. The first is a magnitude 11.6 star at an angular separation of Script error: No such module "val". along a position angle of 139°, as of 1997.[4] The second is an 11th magnitude star at a separation of Script error: No such module "val". with a position angle of 5°.[5] Zeta Pegasi is not known to be a member of a stellar association.[19]
References
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- ↑ Template:Cite simbad
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- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
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