Toward the extinction in compact HII regions in M31

Details Toward the extinction in compact HII regions in M31 Toward the extinction in compact HII regions in M31

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000immm.proc..107n&link_type=abstract

The interstellar medium in M31 and M33. Proceedings 232. WE-Heraeus Seminar, 22-25 May 2000, Bad Honnef, Germany. Edited by El

Computer Science

Scientific paper

Compact HII regions surrounding luminous early-type stars could be recognized by their contribution to the measured magnitude Rc. Applying a special dereddening procedure to a sample with BVRcIc photometry from the catalog of Magnier et al. (1992), we selected starlike objects in M31 that are excessively bright in Rc due to Hα+[S II] emission. Our results are compared with the well calibrated flux densities of compact HII regions (Walterbos & Braun 1992). The typical luminosities (~ 1037 erg/s) and the estimated absolute average magnitudes of the embedded ionizing source (MV = -7.5m) point to a very massive single star or to a small cluster of several massive stars. We also derived the nominal internal extinction of 15 blue objects with reliable individual values of RV. The intrinsic extinction within HII regions is, typically, small indicating that the dust has been swept away by stellar winds.

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