Star, Type-A

Type-A Star (STSC)
Type-A Star (STSC)

Light blue star. Temperatures ranged from 7500 to 10,000°K. A-Type stars were composed of strong hydrogen and some ionized metals.

Each spectral class (O, B, A, F, G, K, M) was divided into 10 subclasses, ranging from 0 (hottest) to 9 (coolest). Stars were also divided into six categories according to luminosity: Ia (most luminous supergiants), Ib (less luminous supergiants), II (luminous giants), III (normal giants), IV (subgiants), and V (main sequence and dwarfs). For instance, Sol was classified as G2V, which meant that it was a relatively hot G-Type main sequence star. In addtion, classes R, N, S, T, Q, and W were used for relatively rare star types not found on the main sequence.[1]

A-Type stars


Monday, July 19th, 2010 Library, Places

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