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YZ Cassiopeiae : ウィキペディア英語版 | YZ Cassiopeiae
YZ Cassiopeiae (21 Cas) is a star system 89 parsecs (290 light years) away from Earth, in the constellation Cassiopeia.〔 It comprises three stars: an eclipsing Algol-type binary and a visually fainter star about 3000 AU distant.〔 The primary star in the YZ Cassiopeiae system is a white subgiant (main sequence) star of spectral type A1m〔 and 2.31 solar masses〔 () with a less massive main sequence dwarf star of type F2V〔Jerzy M. Kreiner, Chun-Hwey Kim, Il-Seong Nha. (YZ CAS: Atlas of O-C Diagrams of Eclipsing Binary Stars )〕 and 1.35 .〔 The apparent magnitude of the eclipsing binary varies from 5.65 to 6.05〔 with a period of 4.4672 days.〔 Combined, they appear to have a spectral type of A2IV.〔 The binary has a dimmer (magnitude 9.7 according to Norton,〔 or 10.5 by SIMBAD) companion of 0.8 〔 orbiting with a period of about 86 580 years.〔 ==References==
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