Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....48..187s&link_type=abstract
Astronomy and Astrophysics, vol. 48, no. 2, Apr. 1976, p. 187-192. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astronomy
3
Carbon Monoxide, Nebulae, Star Clusters, Ubv Spectra, B Stars, H Ii Regions, Interstellar Extinction, Ionizing Radiation, Molecular Spectra, O Stars, Radiation Pressure, Radio Sources (Astronomy), Stellar Mass, Stellar Spectrophotometry
Scientific paper
Photoelectric UBV-H-beta photometry of stars in the region of the Sco OB1 association indicates that the elephant trunk-shaped dark cloud pointing towards NGC 6231, the central cluster of the association, is indeed located at about the same distance as the cluster, some 2.0 kpc away. This is deduced from the fact that the only OB star projected on the elephant trunk, No. 3748, lies at 2.2 kpc and has above average reddening. In addition, a strong CO molecular radio source recently is located in the trunk. It has a radial velocity similar to that of the H II region and the star cluster. The elephant-trunk structure is much larger than elephant trunks known in other galactic nebulae. Its total mass is likely to lie between 2000 and 40,000 solar masses. The location of the dark cloud within the extended H II region surrounding the Sco OB1 association is discussed. The orientation of the elongated dark cloud may be caused by radiation pressure from ionizing photons emitted by the central cluster.
Dachs Joachim
Sherwood W. A.
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