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Stars Star system Median distance Stars in system Spectral type Apparent magnitude (V) Comments and references Hyades: 5 HD 27482: 151: 1: B8V: The Closest Blue Straggler star to Earth. HD 27130: 153: 1: B8V: Chi Tauri: 153: 1: B9.5V: 71 Tauri: 153: 1: B8V: HD 283579: 153: 1: B9.5V: Coma Star Cluster: 3 13 Comae Berenices: 260 ± 20: 1: A3 V: 5 ...
A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant. They are usually considered to be those with luminosity class I and spectral class B9 or earlier, [ 1 ] although sometimes A-class supergiants are also deemed blue supergiants.
The first luminous blue variable to be identified as a variable star was P Cygni, and these stars have been referred to as P Cygni type variables. The General Catalogue of Variable Stars decided there was a possibility of confusion with P Cygni profiles , which also occur in other types of stars, and chose the acronym SDOR for "variables of the ...
These stars also evolve through the core helium burning stage at constant luminosity, first increasing in temperature then decreasing again as they move toward the AGB. However, at the blue end of the horizontal branch, it forms a "blue tail" of stars with lower luminosity, and occasionally a "blue hook" of even hotter stars. [7]
The first list shows a few of the known stars with an estimated luminosity of 1 million L ☉ or greater, including the stars in open cluster, OB association and H II region. The majority of stars thought to be more than 1 million L ☉ are shown, but the list is incomplete. The second list gives some notable stars for the purpose of comparison.
This number is likely much higher, due to the sheer number of stars needed to be surveyed; a star approaching the Solar System 10 million years ago, moving at a typical Sun-relative 20–200 kilometers per second, would be 600–6,000 light-years from the Sun at present day, with millions of stars closer to the Sun.
The following other wikis use this file: Usage on el.wikipedia.org Ιωνικός Νίκαιας (ποδόσφαιρο) Usage on fr.wikipedia.org
Albireo is the star in the head of the constellation of Cygnus (bottom). β Cygni (Latinised to Beta Cygni) is the system's Bayer designation. The brighter of the two components is designated β¹ Cygni or Beta Cygni A and the fainter β² Cygni or Beta Cygni B. The origin of the star system's traditional name Albireo is unclear.
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