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In these cases they are called blue subdwarf (sdB) stars rather than blue giants, named for their position to the left of the main sequence on the HR diagram rather than for their increased luminosity and temperature compared to when they were themselves main-sequence stars.
By analogy to the red giant branch for low-mass stars, this region is also called the blue giant branch. [2] They are larger than the Sun but smaller than a red supergiant , with surface temperatures of 10,000–50,000 K and luminosities from about 10,000 to a million times that of the Sun.
In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [2] to catalog and standardize proper names for stars. The WGSN's first bulletin, dated July 2016, [3] included a table of 125 stars comprising the first two batches of names approved by the WGSN (on 30 June and 20 July 2016) together with names of stars adopted by the IAU Executive Committee ...
This is a list of blue straggler stars in order of their distance from Earth. [1] [2] [3] List. ... Stars in system Spectral type Apparent magnitude (V)
White and blue stars with broad heavy hydrogen lines, such as Vega and Altair. This includes the modern class A and early class F. Secchi class I (Orion subtype) A subtype of Secchi class I with narrow lines in place of wide bands, such as Rigel and Bellatrix. In modern terms, this corresponds to early B-type stars Secchi class II
Such stars predominate within clusters because hotter and more massive stars have exploded as supernovae, or evolved through planetary nebula phases to end as white dwarfs. Yet a few rare blue stars exist in globulars, thought to be formed by stellar mergers in their dense inner regions; these stars are known as blue stragglers.
A "blue moon" refers to a second full moon that falls within the same month span. "A blue moon is really a rare phenomenon," explains Lisa Stardust , astrologer and author.
Regulus A is a binary star consisting of a blue-white subgiant star of spectral type B8, which is orbited by a star of at least 0.3 solar masses, which is probably a white dwarf. The two stars take approximately 40 days to complete an orbit around their common centre of mass.