Why are hydrogen lines most intense in the spectra of A-type stars?
September 23, 2020 | Education|
Strong Balmer lines arise in the atmospheres of those stars in which there are a sufficient number of hydrogen atoms in an excited state at the n -2 level. In hot stars (T> 3 * 10 ^ 4 K) all hydrogen atoms are ionized and, therefore, hydrogen lines simply cannot arise, and in cold stars (T <6 * 10 ^ 3 K) there are few excited atoms.
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