Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..139m&link_type=abstract
Astrophysical Journal, Vol.256, P. 139, 1982
Astronomy and Astrophysics
Astrophysics
15
Scientific paper
CO observations of the molecular cloud complex in the vicinity of IC 5146 reveal three regions of enhanced emission, all lying around the periphery of the Sharpless region S125. The most intense region has a peak CO line temperature of 41 K. The continued existence of this hot spot can be accounted for by an embedded protostar of luminosity class between B0.5 and Bi. A comparison with H I observations of about the same spatial and velocity resolution shows that the surrounding H I cloud emission is generally strong where the CO emission is weak.
The velocity of the H II region, S125, is blueshifted with respect to the gas behind it by 5.6 km s-1. This has yielded an estimate for the expansion age of the H II region of about 105 yr, a factor of 30 smaller than the age given for the stellar cluster.
The whole complex along the elongated dust lane, to a distance of 16.1 pc from the center of S125, shows a velocity gradient of 0.26 km s-1 pc-1. Rotation is considered as a possible cause for the extended geometry of the region.
Dickman Robert L.
McCutcheon William H.
Roger Robert S.
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