Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233..923c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, Aug. 15, 1988, p. 923-928. SERC-supported research
Astronomy and Astrophysics
Astronomy
7
Interstellar Extinction, Interstellar Gas, Molecular Clouds, Stellar Spectra, High Resolution, Line Of Sight, Telescopes
Scientific paper
High-resolution observations of interstellar Na I towards the relatively nearby (180 pc) and lightly reddened, E(B-V) = 0.12, B8V star HD 174632 are presented. There are two distinct interstellar cloud components in this line-of-sight, with heliocentric velocities of about -4.4 and-17.6 km/s. A third, much weaker, component at about -21.7 km/s also appears to be present. Na I column densities for these components have been obtained by line-profile fitting, and estimates have been made of the N(Na I)/N(H) ratios. These are found to be consistent with standard diffuse interstellar clouds. Arguments are presented that these clouds are associated with the boundary between the local low-density interstellar bubble and the neighboring Loop I bubble, at a distance between about 50 and 100 pc from the Sun.
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