Principles of the use of stellar spectral classes (AQA A-Level Physics): Flashcards
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Basis of stellar spectral classes
Basis of stellar spectral classes
Temperature & absorption line strength
Absorption lines in stellar spectra
Absorption lines in stellar spectra
Wavelengths absorbed by elements in star's atmosphere
Source of Balmer lines
Source of Balmer lines
Hydrogen
Energy level for Balmer line excitation
Energy level for Balmer line excitation
Optimal temperature for strong Balmer lines (K)
Optimal temperature for strong Balmer lines (K)
7,500-11,000 K
Spectral class with strongest Balmer lines
Spectral class with strongest Balmer lines
A
Why Balmer lines weak at high temperatures
Why Balmer lines weak at high temperatures
Hydrogen becomes ionised
Class O temperature range (K)
Class O temperature range (K)
25,000-50,000 K
Class A colour & temp. (K)
Class A colour & temp. (K)
Blue/White, 7,500-11,000 K
Class M temperature (K)
Class M temperature (K)
K