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The distance and mass of the large elephant trunk, a CO cloud pointing towards NGC 6231
Photoelectric UBV-H-beta photometry of stars in the region of the ScoOB1 association indicates that the elephant trunk-shaped dark cloudpointing towards NGC 6231, the central cluster of the association, isindeed located at about the same distance as the cluster, some 2.0 kpcaway. This is deduced from the fact that the only OB star projected onthe elephant trunk, No. 3748, lies at 2.2 kpc and has above averagereddening. In addition, a strong CO molecular radio source recently islocated in the trunk. It has a radial velocity similar to that of the HII region and the star cluster. The elephant-trunk structure is muchlarger than elephant trunks known in other galactic nebulae. Its totalmass is likely to lie between 2000 and 40,000 solar masses. The locationof the dark cloud within the extended H II region surrounding the ScoOB1 association is discussed. The orientation of the elongated darkcloud may be caused by radiation pressure from ionizing photons emittedby the central cluster.
| Determination of proper motions in the region of the association Scorpius OB1
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