Interstellar lines toward the Cepheus OB2 association

Details Interstellar lines toward the Cepheus OB2 association Interstellar lines toward the Cepheus OB2 association

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..568c&link_type=abstract

Astrophysical Journal, Part 1, vol. 233, Oct. 15, 1979, p. 568-574.

Astronomy and Astrophysics

Astrophysics

29

Interstellar Matter, Interstellar Radiation, Line Spectra, Stellar Spectra, Abundance, B Stars, Calcium, Electron Density (Concentration), Nebulae, O Stars

Scientific paper

Results are presented for an analysis of the interstellar-line spectra of four stars in the Cepheus OB2 association. The cloud has strong lines of both Ca II and Ca I, and electron number densities are determined directly from the N(Ca I)/N(Ca II) ratio. The depletions of Ca and Ti are found to be less than in typical diffuse interstellar clouds, and it is suggested that these metals have been released from the grains in the cloud - a suggestion supported by the observed shorter wavelength of maximum interstellar polarization toward the cloud. Copernicus observations of Lambda Cep, one of the program stars, reveal the presence of large column densities of both molecular and atomic hydrogen commensurate with the observation of strong lines of CH, CH(+), and CN.

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