Interstellar absorption along the line of sight to Theta Carinae using Copernicus observations

Details Interstellar absorption along the line of sight to Theta Carinae using Copernicus observations Interstellar absorption along the line of sight to Theta Carinae using Copernicus observations

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...83..261a&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 83, no. 2, p. 261-272.

Astronomy and Astrophysics

Astrophysics

32

Atomic Spectra, Interstellar Extinction, Interstellar Matter, Line Of Sight, Lyman Spectra, Absorption Spectra, Line Spectra

Scientific paper

A profile fitting technique is employed to identify the velocities and Doppler b values for H I and H II clouds along the line of sight to Theta Car. Total abundances and depletions for 12 elements, plus column densities for the J = 0 to J = 5 rotational levels of H2 are obtained. Electron densities for both clouds are calculated from the ratios of the fine-structure levels of C II and N II, obtaining 0.08/cu cm and 1.2/cu cm. The fine-structure levels of C I, which led to 120/cu cm, are used to calculate the neutral hydrogen density for the H I region. D I is also present in the data from the Theta Car line of sight, yielding a D/H ratio of 5 x 10 exp -6. Elemental depletions are calculated for the H I region as well. Comparison of the results for Theta Car and those for Zeta Oph and Alpha Vir shows that the absolute depletions are different; however, the relative depletions are remarkably stable for different physical conditions.

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