Interstellar molecular carbon in distant supergiants

Details Interstellar molecular carbon in distant supergiants Interstellar molecular carbon in distant supergiants

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...154..336g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 154, no. 1-2, Jan. 1986, p. 336-342.

Astronomy and Astrophysics

Astrophysics

28

Carbon, Interstellar Matter, Stellar Spectra, Supergiant Stars, Abundance, Molecular Excitation, Spectral Line Width

Scientific paper

The results of a search for interstellar C2 lines in the spectrum of southern reddened supergiants are reported. The C2 excitation parameters along the lines of sight to HD 169454 and BD -14°5037, both in the Sct OB3 association, have been determined. Radiative excitation effects of high rotational levels were found in HD 169454. The C2 lines in BD -14°5037 are clearly double. A spectrum of HD 92693, in Car OB1, shows C2 lines weak in proportion to its color excess EB-V, but otherwise the column densities N(C2) for all stars so far observed appear linearly correlated to EB-V. Through the known relation of EB-V with molecular hydrogen column density N(H2), a mean columnar abundance N(C2)/N(H2) = 3.0×10-8 has been estimated, which agrees with theoretical predictions for the C2 abundance in dense molecular clouds.

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