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Stellar Spectral Classes
Energy levels in atoms
Electrons in an atom exist in energy levels.…read more

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Intensity of Balmer lines depends on temperature of star
Spectral Classes
Stars classified into groups ­ spectral classes
Spectral class of star depends on relative
strength of certain absorption lines
In order of decreasing temperature, peak
wavelength increasing:
O,B,A,F,G,K,M
O ­ hottest stars ­ blue + M ­ coolest stars ­ red
Sun ­ G star
A ­ strong absorption lines
Spectral Class Colour Temp/K Absorption lines
O Blue 25000-50000 Strongest spectral
lines are He+/He
absorptions ­ they
need high temp and
have weak H…read more

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