|
BI Cygni
BI Cygni (BI Cyg, IRC +40408, BD+36 4025) is a red supergiant in the constellation Cygnus. It is an irregular variable star with a maximum brightness of magnitude 8.4 and a minimum of magnitude 9.9. It is considered a member of the stellar Cygnus OB1 association, its distance is around of the Solar System. It is less than a degree south of another variable red supergiant, BC Cygni. BI Cyg is a slow irregular variable star classified as type Lc, an irregular supergiant. Its brightness changes between extremes of magnitude 8.4 and 9.9. Frequency analysis of its light curve shows no significant periods. BI Cyg is one of the largest known stars with a radius around based on the assumption of an effective temperature of 3,575 K and a bolometric luminosity of . More recent studies derive lower luminosities below , suggesting an initial mass of , and consequently lower values for the radius. See also *RW Cygni RW Cygni is a semiregular variable s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
γ Cygni
Gamma Cygni (γ Cygni, abbreviated Gamma Cyg, γ Cyg), officially named Sadr , is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. Based upon parallax measurements obtained during the Hipparcos mission, it is approximately 1,800 light-years (560 parsecs) from the Sun. It forms the primary or 'A' component of a multiple star system designated WDS J20222+4015 (the secondary or 'BC' component is CCDM J20222+4015BC, a close pair of stars 40" away from γ Cygni). Nomenclature ''γ Cygni'' ( Latinised to ''Gamma Cygni'') is the star's Bayer designation. WDS J20222+4015A is its designation in the Washington Double Star Catalog. It bore the traditional name ''Sadr'' (also rendered ''Sadir'' or ''Sador''), derived from the Arabic صدر ''ṣadr'' "chest", the same word which gave rise to the star Schedar ( Alpha Cassiopeiae). In 2016, the International Astronomical Union organized a Working ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
