High-resolution sounding rocket observations of interstellar H2 lines toward Delta Scorpii

Details High-resolution sounding rocket observations of interstellar H2 lines toward Delta Scorpii High-resolution sounding rocket observations of interstellar H2 lines toward Delta Scorpii

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..402s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 402-410.

Computer Science

Sound

2

Absorption Spectra, H Lines, Interstellar Matter, Rocket Sounding, Ultraviolet Spectra, Molecular Excitation, Molecular Rotation, Spectral Line Width, Velocity Measurement

Scientific paper

The results of observations made with an far-ultraviolet echelle spectrograph on interstellar absorption lines from the Lyman system of H2 toward the B0.5 IV star Delta Scorpii are reported. Equivalent widths are used to derive a total H2 column density of 2.8 x 10 to the 19th/sq cm, and a kinetic temperature of 62 K is inferred from the population ratio of the J = 0 and J = 1 rotational states. An excitation temperature of 210 K for J levels between two and five gives constraints on the H2 formation rate and the loud volume density and implies that the local ultraviolet radiation field is roughly six times as intense as the average value in the solar neighborhood. It is shown that there is little or no systematic velocity separation among the excited rotational levels.

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