Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..301f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Feb. 1985, p. 301-307. Research supported by the Natural Sciences and Engineerin
Astronomy and Astrophysics
Astronomy
22
Galactic Structure, Interstellar Extinction, Milky Way Galaxy, Star Distribution, B Stars, Molecular Clouds, O Stars, Spirals, Stellar Spectrophotometry, Ubv Spectra
Scientific paper
New and existing observations of 300 OB stars are used to examine the distribution of interstellar extinction within the highly obscured region of the Milky Way between longitudes 30 and 70 deg. The region has been divided into 16 zones, each of relatively uniform extinction. The total visual absorption as a function of distance for each zone is shown in a series of diagrams. In general, extinction throughout the region is confined to clouds within 500-1000 pc of the sun. Beyond this distance, there is often little or no addition extinction out to distances of 4-5 kpc and sometimes farther. The most heavily obscured portion of the region is found between longitudes 32 and 44 deg and appears to be associated with a recently discovered molecular cloud at a distance of about 2 kpc (Huang et al. 1983).
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