![]() Most stars are part of a multiple star system The Sun is G2V, V being the stellar luminosity class for the main-sequence.Īn example of the discrimination between K2-type stars is illustrated in the following table: Technical Difference in Spectra of Same Spectral Class Since 9 out of 10 stars are on the main-sequence, this is already pretty goodĬan we distinguish stars that are off the main-sequence by their spectra? The simple procedure outlined above under spectroscopic parallax Only distances to stars on the main-sequence can be correctly determined by Look at H-R diagram for expected LuminosityĪnd use inverse-square law to deduce distance (not really a parallax - just a method for finding distance)
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