Collisional broadening of the sodium D lines by atomic hydrogen

Details Collisional broadening of the sodium D lines by atomic hydrogen Collisional broadening of the sodium D lines by atomic hydrogen

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.217..679s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 217, Dec. 1, 1985, p. 679-684. SERC-supported research.

Astronomy and Astrophysics

Astrophysics

15

Atomic Collisions, D Lines, Hydrogen Atoms, Sodium, Solar Atmosphere, Solar Spectra, Spectral Line Width, Abundance, Atmospheric Models, Thermodynamic Equilibrium

Scientific paper

The wings of the sodium D lines observed in the solar spectrum are used to test a recently revised theoretical value of the broadening parameter arising from collisions between sodium and hydrogen atoms. A model atmosphere analysis using the Holweger-Mueller atmosphere, the revised broadening parameter and an appropriate value of the sodium abundance yields calculated D-line profiles in good agreement with the observed profiles over those regions of the line wings which are not distorted by blends. A recent experimental determination of the broadening parameter, which yielded a value about 30 percent larger than the revised theoretical value, is less favored by the astrophysical evidence.

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