Unformatted text preview: -Cannon re-organized the spectra types to form a temperature sequence: O,B,A,F,G,K,M (hot to coolest) – “oh be a fine girl kiss me” How Do We Classify Stars?-O type stars are the hottest-M type stars are the coolest Spectral Sub-Type OBAFGKM-A star’s spectral type can be specified more precisely using a subtype ranging from 0 to 9.-Example: spectral type A is divided into A0,A1,A2…A9-A0 is the hottest, and A9 is the coldest.-F0 is cooler than A9-If you know a star’s spectral type, then you know its temperature.-The sun is a type G2 star, corresponding to a temperature of 5800 K Stars: What do we know?-Temperature (T) & Spectral Type-Distance-Brightness 1. Luminosity (Lstar) – energy output of a star...
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This document was uploaded on 10/07/2011.
- Fall '09