Copernicus observations of interstellar absorption at Lyman alpha

Details Copernicus observations of interstellar absorption at Lyman alpha Copernicus observations of interstellar absorption at Lyman alpha

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975stin...7519100b&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Interstellar Matter, Oao, Radiation Absorption, Satellite Observation, Astronomical Spectroscopy, Interstellar Gas, Stellar Spectra

Scientific paper

Column densities NH of atomic hydrogen have been derived for 40 OB stars from spectral scans at Lyman alpha obtained by the Copernicus (OAO-3) satellite. The stars are all between 60 and 1100 pc away with a range of mean densities nH of 0.01 to 2.5 atoms cm-3. The gas to color-excess ratio in clouds varies from 1 to 3 times the mean outside of clouds. The presence of molecular hydrogen correlates with E(B-V), but the best tracer for H2 is atomic hydrogen. The mean density of the gas for all 40 stars is much smaller than the mean of 0.7 atoms cm-3 obtained from 21-cm observations, because the brightest stars with less than average amounts of matter in the line of sight were selected for observation.

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