Satellites on Lyman Alpha Due to H-H and H-H + Collisions

Details Satellites on Lyman Alpha Due to H-H and H-H + Collisions Satellites on Lyman Alpha Due to H-H and H-H + Collisions

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450l..75k&link_type=abstract

Astrophysical Journal Letters v.450, p.L75

Astronomy and Astrophysics

Astronomy

15

Atomic Processes, Plasmas, Stars: White Dwarfs, Techniques: Spectroscopic

Scientific paper

We have experimentally observed satellites on Lyman- alpha arising from radiative collisions of excited atomic hydrogen with unexcited neutral hydrogen atoms or protons. The wavelength, relative intensity, and shape of features in the Lyman- alpha wing emitted by a laser-produced plasma in pure hydrogen agree with new theoretical calculations based on ab initio H ^{+}2 and H2 potentials. These results confirm the identification of satellites observed with IUE and HST in the ultraviolet spectra of hydrogen-rich white dwarfs, and verify the accuracy of the spectral line shape theory used to determine their effective temperatures and surface gravities.

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