Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87..685h&link_type=abstract
Astronomical Journal, vol. 87, Apr. 1982, p. 685-690.
Astronomy and Astrophysics
Astronomy
7
B Stars, O Stars, Radio Astronomy, Shock Fronts, Spectral Resolution, Star Formation, Angular Resolution, H Ii Regions, Interstellar Matter, Molecular Clouds, Stellar Envelopes, Stellar Winds
Scientific paper
The Westerbork Synthesis Radio Telescope has been used at 6 cm wavelength to obtain higher-resolution maps of the H II region G 134.2 + 0.8. The corrected total flux density was found to be 154 mJy, consistent with the presence of a single early-type star situated at its center. The radius is approximately 0.15 pc. The exciting star has spectral type B0.5, thirteen solar masses, 30,000 solar luminosities, and 55,000 yr to contract onto the main sequence. The ridge of emission running almost north-south through the H II region is probably due to a shell of ionization produced by the OB association at its center, and the rms electron density is 46/cu cm. It is concluded that the star probably formed in the dense region ahead of the shock front, but that this shock has now moved across the star and is being maintained by stellar winds from the OB association in IC 1805.
Hughes V. A.
Viner M. R.
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