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SX Arietis Variables
SX Arietis variables are a class of variable stars. They are generally B-type main sequence stars of spectral types B0p to B9p— high-temperature analogues of Alpha2 Canum Venaticorum variable, Alpha2 Canum Venaticorum variables—and exhibit strong magnetic fields and intense Helium, He I and Silicon, Si III spectral lines. They have brightness fluctuations of approximately 0.1 Apparent magnitude, magnitudes with periods of about one day. The prototype of this class is 56 Arietis, which bears the variable star designation ''SX Arietis''. List The following list contains selected SX Arietis variable that are of interest to amateur or professional astronomy. Unless otherwise noted, the given magnitudes are in the Apparent magnitude#Standard reference values, V-band. Notes References Samus N.N., Durlevich O.V., et al. ''Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.)'' {{Variable star topics SX Arietis variables, * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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28 Cygni
28 Cygni is a binary star in the northern constellation of Cygnus. It is a faint blue-white hued star but visible to the naked eye with an apparent visual magnitude of 4.93. The distance to 28 Cyg, as estimated from its annual parallax shift of , is around 840 light years. It has an absolute magnitude of −2.56, which means that if the star were just away it would be brighter than Sirius, the brightest star in the night sky. This primary object is a B-type main-sequence star with a stellar classification of B2.5 V, per Lesh (1968). Slettebak (1982) found a class of B2 IV(e), which would suggest this is a more evolved subgiant star. It is a Be star, which means the spectrum displays emission lines due a disk of ejected gas in a Keplerian orbit around the star. The star displays short-term variability with two or more periods, and is classified as an SX Arietis variable by Samus et al. (2017). It is spinning rapidly with a projected rotational veloc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |