Observations of interstellar NA I lines at 3302 A

Details Observations of interstellar NA I lines at 3302 A Observations of interstellar NA I lines at 3302 A

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..634c&link_type=abstract

Astrophysical Journal, vol. 202, Dec. 15, 1975, pt. 1, p. 634-637.

Other

39

Acoustic Velocity, D Lines, Interstellar Matter, Line Spectra, Spectral Line Width, Abundance, Isothermal Processes, Sodium, Stellar Evolution, Vertical Distribution

Scientific paper

Observations have been made of the equivalent widths of the interstellar Na I doublet at 3302 A toward 21 stars which have strongly saturated D-lines. Column densities of Na I have been derived, and the depletion of Na in the interstellar medium is discussed. Toward most stars, Na is depleted by about a factor of 6. The distribution of line widths is found to be strongly peaked near 1 km/s, in agreement with the isothermal sound velocity at 100 K.

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