Para/ortho abundance ratio of molecular hydrogen in NGC 2023

Details Para/ortho abundance ratio of molecular hydrogen in NGC 2023 Para/ortho abundance ratio of molecular hydrogen in NGC 2023

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318l..81t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 15, 1987, p. L81-L84.

Astronomy and Astrophysics

Astrophysics

29

Abundance, Hydrogen Clouds, Molecular Clouds, Reflection Nebulae, Infrared Spectra, Interstellar Matter, Molecular Rotation, Ortho Para Conversion

Scientific paper

Recent infrared emission-line observations by Hasegawa et al. (1987) clearly indicate that the para/ortho abundance ratio of H2 in the reflection nebula NGC 2023 is quite different from 1:3. A simplified steady-state problem is solved to determine the vibrational-rotational level population. In addition to radiative processes, the H2 formation on grains and the gas-phase para/ortho conversion processes are taken into account. A good fit to the observed line intensity ratio can be obtained if the rotational Boltzmann distribution with temperature Tf = 60-70 K is assumed for H2 formed on grain surface.

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