Further thoughts on the interstellar spectrum of HD 174632

Details Further thoughts on the interstellar spectrum of HD 174632 Further thoughts on the interstellar spectrum of HD 174632

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..707c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, June 15, 1991, p. 707-711.

Astronomy and Astrophysics

Astronomy

6

Dark Matter, Interstellar Matter, Molecular Clouds, Astronomical Spectroscopy, Calcium, Sodium

Scientific paper

High-resolution observations (3.6 km/s FWHM) of interstellar Ca II toward the star HD 174632 are presented. This spectrum complements the Na I spectrum presented in a previous paper (Crawford 1988), and enables additional conclusions to be drawn as to the origin of the observed absorption components. Of the three components observed in both Ca II and Na I, that at -4.3 km/s is now attributed to diffuse gas associated with the R CrA dark cloud, and that at -22 km/s is interpreted as arising in the local interstellar medium; the origin of the component at -18 km/s is unclear, but it appears to exist beyond the local interstellar bubble and has a Na I/Ca II ratio suggestive of an origin in relatively dense gas.

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