Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.1110l&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #11.10; Bulletin of the American Astronomical Society, Vol. 33, p.1325
Astronomy and Astrophysics
Astronomy
Scientific paper
We analyze the H2 and CO absorption transitions along the line of sight towards HD 37903 over the 1045-1060 and 1086-1102 Å wavelength regions, which is observed by Berkeley Extreme and Far-ultraviolet Spectrometer (BEFS) on the ORFEUS II telescope. HD 37903 is a bright UV emitting star embedded in the southern part of the Orion B molecular cloud, illuminating the reflection nebula NGC 2023. Based on the theory of formation and dissociation of molecular hydrogen in the Far-UV spectral range (Jura 1975), we address the physical conditions of the foreground gas toward HD 37903, such as the density n, temperature T, and the UV intensity IUV, by analyzing the H2 absorption lines of J = 0-5 rotational levels. The observed gas is shown to surround the photodissociation region of the NGC 2023. We identify the CO absorption line at 1088 Å and calculate the direct abundance ratio [CO]/[H2] to be 4.6 x 10-7, which is consistent with the survey study made by Federman et al. (1980). Jura 1975, ApJ, 197, 581 Federman et al. 1980, ApJ, 242, 545
Hong Jae Sub
Hurwitz Margaret M.
Lee Dong Hwan
Min Kyoung-Wook
Ryu Kwang Sun
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