Spectral class is classification of stars by their external features..Like light,temperature etc..
The O spectral class is the highest temperature class. Stars in this class are extremely hot and blue in color, with surface temperatures exceeding 30,000 K.
Alpha Centauri A is a nearby star that is in the same spectral class as the sun, which is G-class. It is the primary component of the Alpha Centauri star system, located about 4.37 light-years away from Earth.
The Sun is a G-type main-sequence star, also known as a G2V star. This classification places the Sun in the "yellow dwarf" category.
If you are referring to the Yerkes spectral classification, a Class IV star is known as a subgiant.
Barnard's Star is a red dwarf star, belonging to the class M. This classification is based on its low surface temperature and spectral characteristics.
The spectral class is A0Va.
Antares has a spectral class of M1LB.
Spectral class Y, which is typical of "brown dwarf" stars.
Sirius is a double star. The brighter component ... the one you actually notice in the night sky ... is spectral class A1V. The faint 'secondary' component is spectral class DA2.
The O spectral class is the highest temperature class. Stars in this class are extremely hot and blue in color, with surface temperatures exceeding 30,000 K.
Two stars of the same spectral class must have the same temperature and color. This classification system groups stars based on their temperature, with each spectral class representing a specific range of temperatures.
A star with a spectral class of O is classified as a Blue Star. A red star will have a spectral class of M See related question
The spectral class letters in astronomy represent the temperature and color of stars. The sequence starts with O (hottest and bluest stars) and ends with M (coolest and reddest stars). The spectral class letters are O, B, A, F, G, K, and M.
Spectral class is the categorization of stars by temperature and size, mostly the former. Spectral class B is very hot. In descending order (hottest to coolest) the spectral classes are O,B,A,F,G,K,M. You can see that B is very near the top.
Alpha Centauri A is a nearby star that is in the same spectral class as the sun, which is G-class. It is the primary component of the Alpha Centauri star system, located about 4.37 light-years away from Earth.
It is an orange giant with a spectral class of K3....
It's an M3V (red dwarf).