Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....37..139f&link_type=abstract
Astronomy and Astrophysics, vol. 37, no. 1, Dec. 1974, p. 139-144.
Astronomy and Astrophysics
Astrophysics
32
A Stars, Astronomical Models, Atmospheric Models, Balmer Series, Stellar Atmospheres, Thermodynamic Equilibrium, Absorption Spectra, H Lines, Line Shape, Linearization, Mathematical Models, Stellar Spectra
Scientific paper
Using the complete linearization method, NLTE-models have been computed for pure hydrogen atmospheres, including the effect from the absorption lines for three gravities at the effective temperature 10,000 K. From these models detailed line profiles for H-alpha, H-beta, and H-gamma were derived and compared to the same lines computed with the assumption of local thermal equilibrium (LTE). The differences between LTE and NLTE are for all models large in the line cores, where the NLTE-calculations agree much better with the observations. For a value of g of 100 cm per sec per sec, important changes are seen for a greater part of the profile.
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