## The Balmer lines in early type stars |

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### Contents

STARK BROADENING AND COLLISION CROSS SECTIONS | 15 |

THE LINE SOURCE FUNCTION AND THE APPROXIMATION | 39 |

COMPARISON | 73 |

1 other sections not shown

### Common terms and phrases

agreement approximation of detailed assume Astrophysical Journal asymptotic Avrett Balmer lines behavior blanketed model atmosphere bound-bound transitions bound-free transitions broadening theories calculations center optical depth Chapter collision cross sections collision rates collisional comparison consider cross-section density departure coefficients departures from LTE detailed balancing discussed Doppler Doppler profile early type stars effective temperature equations of statistical equivalent widths estimate ESW theory Figure frequency Furthermore Griem theory Hummer Hy profiles hydrogen line hydrogen line blanketed impact parameter indicated integral equation iteration line center optical line profiles line source function line transfer problems log g luminosity matrix Mihalas Modified Bethe monochromatic observations obtained opacity optical depth photospheric Phys principal quantum procedure quasi-static radiation field radiative rates ratio regions relaxation length Saraph Sirius and Vega solution solved Stark broadening statistical equilibrium stellar atmospheres stimulated emissions surface gravities Teff temperature correction temperature distributions temperature structure two-level atom uncertainties wings