Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3413h&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #34.13; Bulletin of the American Astronomical Society, Vol. 25, p.850
Astronomy and Astrophysics
Astronomy
Scientific paper
We have measured the far-infrared, fine-structure lines of [O\I.] 63\mm. and [C\II.] 158\mm. from the reflection nebulae \NGC 2245, \NGC 2247, \IC 446, CED 201, and P18, using the Cooled Grating Spectrometer aboard the Kuiper Airborne Observatory. Far-infrared continuum maps (Casey 1991, ApJ, 731, 183) show that these nebulae are isolated and relatively compact ( ~ less 1'). We interpret the observed line emission as arising from warm, atomic gas which has been photodissociated by the ultraviolet (UV) radiation field of the exciting stars. Our measured line ratios ([C\II.]/[O\I.] ~ 3), combined with the continuum data of Casey and the photodissociation region (PDR) models of Tielens and Hollenbach (1985, ApJ, 291, 722), are used to infer gas densities ~ few *E00 cm(-3) , maximum gas temperatures ~ 200 K, and incident UV fields for the individual reflection nebulae. These nebulae have central stars with spectral types of B2--B9. Their PDRs have densities and UV fields which are an order of magnitude lower than those associated with the hot stars in regions like Orion and \M 17SW.
Erickson Edwin F.
Haas Michael R.
Rudolph Alexander L.
Tielens Alexander G. G. M.
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