Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.0720g&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #07.20; Bulletin of the American Astronomical Society, Vol. 32, p.1404
Other
Scientific paper
We have detected absorption lines of H3+ near 3.7 μ m toward the star HD 183143, which is obscured by about five visual magnitudes and has very strong diffuse interstellar bands. Previously, H3+ in the diffuse interstellar medium has been sought and found only toward the galactic center and Cygnus OB2 No. 12 and No. 5. The unexpectedly strong absorption lines toward Cygnus OB2 indicate an order of magnitude more H3+ than expected, using the best available values for the cosmic ray ionization rate and the rate coefficient for dissociative recombination of H3+ on electrons, together with conventional models for the Cygnus OB2 clouds. Specialized models of these clouds have been proposed to account for the larger than expected abundance of H3+. However, the large column density of H3+ observed toward HD183143, a cooler, lower luminosity, less obscured, and less active star than Cygnus OB2 No. 12, coupled with millimeter wave measurements showing little or no associated dense molecular gas, cannot be explained by such models. We discuss other possible explanations for the surprisingly strong H3+ absorption lines in the diffuse interstellar medium.
Geballe Thomas Ronald
Hinkle Kenneth H.
McCall Benhamin J.
Oka Takashi
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