There is no star just called "Alpha". Alpha is the first letter of the Greek alphabet, and the main star of each of the 88 constellations is called "Alpha", followed by the name of the constellation (in genitive form). For example, Alpha Canis Majoris, Alpha Centauri, Alpha Geminis, etc.
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Alpha Ceti (Menkar, Menkab) is a star in the constellation of Cetus.It has a temperature of about 3,700K
65,000 degrees is how hot Alpha is.
3882 Kelvin
Alpha Centauri has a temperature ranging from 5,000-6,000K.
The surface temperature of the star Thuban is 9800 K. Another name for the Thuban star is Alpha Draconis. It is thought to be located 310 light years from the constellation of Draco.
Menkar (Alpha Ceti) is the alpha star in Cetus.
There is no star that is simply called "Alpha". There are several that have "alpha" in their name, for example Alpha Centauri, Alpha Cruxis, Alpha Canis Majoris, etc. - usually the brightest star in each constellation. Some stars such as Betelgeuse (Alpha Orionis) are not actually the brightest star in the constellation.
Alpha Centauri (Rigil Kentaurus, Rigil Kent or Toliman) is the brightest star in the southern constellation of Centaurus.It has a temperature of about 5,790 Kelvin.
Antares is the alpha star in Scorpius.