High-resolution observations of the interstellar 3302-wavelength NA I doublet and a discussion of the resulting NA I/Ca II ratios

Details High-resolution observations of the interstellar 3302-wavelength NA I doublet and a discussion of the resulting NA I/Ca II ratios High-resolution observations of the interstellar 3302-wavelength NA I doublet and a discussion of the resulting NA I/Ca II ratios

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259...47c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 1, p. 47-62.

Astronomy and Astrophysics

Astronomy

33

Astronomical Spectroscopy, Calcium, Early Stars, Interstellar Matter, Molecular Clouds, Sodium, Abundance, B Stars, Line Spectra, Metallicity, O Stars, Spectral Line Width

Scientific paper

High-resolution (6 km/s FWHM) observations of the interstellar 3302-wavelength Na I doublet towards 11 southern early-type stars are presented. The analysis has resulted in much more accurate Na I column densities than those obtained from earlier studies of the (fully saturated) Na D lines. The 3302-wavelength lines have low radial velocities and are much simpler than the Na D and Ca II profiles towards the same stars, generally occurring at those velocities previously identified with diffuse molecular clouds. Analysis of the Na I/Ca II ratios in these components indicates that delta- Ca II of about -3 to -4 in the molecular clouds, implying that most of the Ca has been adsorbed on to the surfaces of interstellar grains. Lower Ca depletions are found in the less dense (nonmolecular) clouds which are responsible for the additional absorption observed in the Na D and Ca K lines at both high and low velocities.

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