JCMT observations of the ionizing stars in the H II region W40

Details JCMT observations of the ionizing stars in the H II region W40 JCMT observations of the ionizing stars in the H II region W40

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..998v&link_type=abstract

The Astronomical Journal, vol. 108, no. 3, p. 998-1001

Physics

6

Cosmic Dust, Emission Spectra, H Ii Regions, Ionization, Main Sequence Stars, Mass, Massive Stars, Stellar Envelopes, Stellar Physics, Astronomical Observatories, Bolometers, Graphs (Charts), Molecular Clouds, Spectrum Analysis, Tables (Data)

Scientific paper

Continuum observations of the main ionizing stars OS1a, OS2a, and OS3a in the H II region/molecular cloud W40 were made with the James Clerk Maxwell Telescope in Hawaii, in August 1991, January 1992, and June 1993. OS1a was detected at a level of 56 +/- 18 mJy at 1.1 mm wavelength. OS2a was detected with a mean of 256 +/- mJy at 1.1 mm, and at 654 +/- 160 mJy at 0.8 mm. OS3a was not detected at 1.1 mm. These mm-submm observations imply the existence of substantial circumstellar material around the main ionizing star OS2a (approx. 0.1 solar mass), and a smaller amount around OS1a (approx. 0.02 solar mass). Only an upper limit is inferred for OS3a.

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