Models of expanding photodissociation regions

Details Models of expanding photodissociation regions Models of expanding photodissociation regions

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rmxac..40..189e&link_type=abstract

XIII Latin American Regional IAU Meeting (Eds. W. J. Henney & S. Torres-Peimbert) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Scientific paper

A star embedded in a molecular cloud will produce an H II region surrounded by a region of photodissociated atomic gas. We constructed spherical models of the photodissociation (or photon-dominated) region by calculating the balance of photodissociation and formation of H_2. The calculation of the photodissociation rate of H_2 includes the Lyman and Werner transitions from the 256 bound levels of the ground state. Collisions with H and H_2, and quadrupole radiative transitions are included in the calculation of the ground state levels. The UV radiation from the central star is attenuated by dust absorption and self-shielding by H_2.

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