Orfeus Observations of Ultraviolet Excited High-J Molecular Hydrogen

Details Orfeus Observations of Ultraviolet Excited High-J Molecular Hydrogen Orfeus Observations of Ultraviolet Excited High-J Molecular Hydrogen

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jkas...42..145l&link_type=abstract

Journal of the Korean Astronomical Society, vol. 42, no. 6, pp. 145-153

Astronomy and Astrophysics

Astronomy

Ism: Hh, Ism: Molecular Clouds, Ultraviolet: Fuv

Scientific paper

We present measurements of diffuse interstellar hh\ absorption lines in the continuum spectra of 10 early-type stars. The data were observed with the Berkeley Extreme and Far-Ultraviolet Spectrometer (BEFS) of the ORFEUS telescope on board the ORFEUS-SPAS I and II space-shuttle missions in 1993 and 1996, respectively. The spectra extend from the interstellar cutoff at 912 Å to about 1200 Å with a resolution of ˜ 3000 and statistical signal-to-noise ratios between 10 and 65. Adopting Doppler broadening velocities from high-resolution optical observations, we obtain the hh\ column densities of rotational levels J'' = 0 through 5 for each line of sight. The kinetic temperatures derived from J'' = 0 and 1 states show a small variation around the mean value of 80 K, except for the component toward HD 219188, which has a temperature of 211 K. Based on a synthetic interstellar cloud model described in our previous work, we derive the incident UV intensity I_{UV} and the hydrogen density n_H of the observed components to be -0.4 ≤ log I_{UV} ≤ 2.2 and 6.3 ≤ n_{H} ≤ 2500 cm^{-3}, respectively.

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