Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..264c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 15, 1992, p. 264-272.
Other
30
Calcium, Early Stars, Metallicity, Milky Way Galaxy, Molecular Clouds, Sodium, Absorption Spectra, Interstellar Matter, Spectral Line Width, Stellar Composition
Scientific paper
High-resolution observations (3.6 km/s FWHM) of interstellar Na I and Ca II lines toward five southern early-type stars are presented. All five stars have strong absorption lines with low LSR radial velocities (not greater than 5 km/s) which are interpreted as arising in material associated with the ridge of local molecular clouds identified by Dame et al. (1987). It is argued that the strong, low-velocity, atomic and molecular lines observed toward other southern stars close to the Galactic plane also arise in this material, and special reference is made to the foreground interstellar spectrum of the Sco OB1 association. Four of the observed stars also have absorption components consistent with an origin in the Sagittarius-Carina spiral arm, and two (HD 111904 and 164402) have highly negative velocity components (v(lsr) not greater than -40 km/s) which are interpreted as arising in expanding shells centered on the Cen OB1 and Sgr OB1 associations, respectively.
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