ORFEUS-II Observations of Molecular Hydrogen in the Interstellar Medium

Details ORFEUS-II Observations of Molecular Hydrogen in the Interstellar Medium ORFEUS-II Observations of Molecular Hydrogen in the Interstellar Medium

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.5011d&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #50.11; Bulletin of the American Astronomical Society, Vol. 29, p.1295

Astronomy and Astrophysics

Astronomy

Scientific paper

We present measurements of interstellar H_2 absorption lines in the continuum spectra of 15 early-type stars observed with the Berkeley spectrometer on the ORFEUS telescope during the ORFEUS-SPAS II space-shuttle mission in November/December 1996. The spectra extend from the interstellar cutoff at 912 Angstroms to about 1216 Angstroms with a resolution of 3000 and statistical signal-to-noise ratios between 20 and 80. We determine column densities for each observed rotational level and derive excitation temperatures and densities for the H_2 clouds along each line of sight. We compare our results with those of previous Copernicus and ORFEUS observations. This work is supported by NASA grant NAG5-696.

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