Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..171s&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 171-187.
Astronomy and Astrophysics
Astrophysics
59
Early Stars, Line Spectra, Stellar Rotation, Stellar Spectra, B Stars, Classifications, H Lines, Metals, Spectral Line Width
Scientific paper
Line profiles and equivalent widths of spectrum lines used in the classification of early-type stars are calculated for rigidly rotating B0-F8 models, taking into account shape distortion and gravity darkening. Changes in line strengths of He I 4144 and 4471, Si II 4128-4131, H-gamma, Fe I 4476, and Mg II 4481 are shown as functions of the fractional angular velocity and inclination of the rotation axis of the models. The line ratios He I 4144/Si II 4128-4131 and He I 4471/Mg II 4481 do not change appreciably with rotation for moderately rotating models viewed from any angle or for rapidly rotating pole-on models. Rotation causes only slight changes in the strength of H-gamma in B-type models. H-gamma line strengths are predicted to decrease with increasing rotation in A- and F-type models. The Mg II 4481 line is somewhat affected by rotation for A- and F-type models in the sense that it is predicted to decrease in strength with increasing rotation.
Collins George W. II
Kuzma T. J.
Slettebak Arne
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