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Main-sequence stars vary in surface temperature from approximately 2,000 to 50,000 K, whereas more-evolved stars – in particular, newly-formed white dwarfs – can have surface temperatures above 100,000 K. [3] Physically, the classes indicate the temperature of the star's atmosphere and are normally listed from hottest to coldest.
Alpha Librae, called Zubenelgenubi, is a multiple star system divisible into two stars when seen through binoculars, The primary (Alpha 2 Librae) is a blue-white star of magnitude 2.7 and the secondary (Alpha 1 Librae) is a white star of magnitude 5.2 and spectral type F3V that is 74.9 ± 0.7 light-years from Earth. Its traditional name means ...
The color of a star, as determined by the most intense frequency of the visible light, depends on the temperature of the star's outer layers, including its photosphere. [176] Besides visible light, stars emit forms of electromagnetic radiation that are invisible to the human eye .
β Ursae Majoris (Latinised to Beta Ursae Majoris) is the star's Bayer designation. It bore the traditional name Merak derived from the Arabic المراق al-marāqq 'the loins' (of the bear). [7] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [19] to catalog and
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 ...
Below there are lists the nearest stars separated by spectral type. The scope of the list is still restricted to the main sequence spectral types: M , K , F , G , A , B and O . It may be later expanded to other types, such as S , D or C .
The easternmost star designated by Flamsteed, 19 Lyrae, is also a small-amplitude variable, an Alpha 2 Canum Venaticorum variable with a period of just over one day. [52] Another evolved star is the naked-eye variable XY Lyrae, a red bright giant [46] just north of Vega that varies between 6th and 7th magnitudes over a period of 120 days. [53]
α Pavonis (Latinised to Alpha Pavonis) is the star's Bayer designation.. The historical name Peacock was assigned by His Majesty's Nautical Almanac Office in the late 1930s during the creation of the Air Almanac, a navigational almanac for the Royal Air Force.