Lyman and Balmer continuum ionization in zero-age main-sequence stas - Applications to the line excess phenomenon

Astronomy and Astrophysics – Astronomy

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Balmer Series, Gas Ionization, Hydrogen Clouds, Main Sequence Stars, Stellar Spectra, Infrared Astronomy, Line Spectra, Lyman Spectra, Stellar Luminosity, Stellar Mass

Scientific paper

New calculations of the ionization from zero-age main-sequence (ZAMS) stars are presented. Ionization-bounded calculations for photoionization, both from the n = 1 and the n = 2 level of hydrogen, are presented. The n = 2 calculations are used to show that the suggestion of Balmer continuum ionization proposed by Simon et al. can account for the observed hydrogen-line excess in obscured ZAMS objects. The present results show that Balmer continuum ionization is more than adequate for the production of the observed excess.

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