Distances to 14 molecular clouds /including two associated with supernova remnants/ by a new technique

Details Distances to 14 molecular clouds /including two associated with supernova remnants/ by a new technique Distances to 14 molecular clouds /including two associated with supernova remnants/ by a new technique

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1923a&link_type=abstract

Astronomical Journal, vol. 86, Dec. 1981, p. 1923-1925.

Astronomy and Astrophysics

Astronomy

27

Astrometry, Molecular Clouds, Stellar Parallax, Supernova Remnants, Carbon Monoxide, Nebulae, Spectrum Analysis

Scientific paper

We illustrate a new technique for determining distances to dense molecular clouds. Star counts on the POSS blue print are used to establish the foreground star density for 14 clouds. From this quantity, the distance is derived using the empirical relation given by Herbst and Sawyer (1981). The method is reliable for clouds with AV ≳7 mag over areas in excess of 20 arcmin2. Except for spectroscopic parallax of associated stars, it is probably the most accurate method for determining distances to clouds within ∼3200 pc of the Sun. We show that the North American Nebula has a distance of ∼1 kpc, not ∼200 pc as has recently been suggested. We also derive distances for two supernova remnants, W28 and W44, which are known to be interacting with molecular clouds.

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