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.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.