Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..483w&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 483-488. Research supported by the Alfred P. Sloan Foundation;
Astronomy and Astrophysics
Astronomy
39
Abundance, Hydrogen Clouds, Interstellar Matter, Satellite Observation, Stellar Spectra, Born Approximation, Electron Transitions, Interstellar Extinction, Oao 3, Spaceborne Astronomy, Ultraviolet Radiation
Scientific paper
Copernicus satellite measurements of HD in J-double prime = 1 and J-double prime = 0 toward Zeta Oph are reported. The ratio of the number densities of HD in the J = 0 and J = 1 states is determined to be 0.15 + or - 0.02 at the 1-sigma level. A value of approximately 24 x 10 to the -17th erg/cu cm per A at 1000 A is obtained for the UV energy density at the Zeta Oph cloud, and the mechanisms for excitation of HD are examined. A tight upper limit is derived for the abundance of HCl, which has been predicted to be present due to the interaction of ionized chlorine with neutral hydrogen. A calculation is performed which indicates that the cloud is 28 pc from the star. It is shown that the two-component cloud model of Black and Dalgarno (1977) with densities of 500 and 2500 H nuclei per cu cm for the outer regions and core, respectively, is in excellent agreement with the observations.
Morton Donald C.
Wright Louis E.
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