H I towards the Lambda Orionis region

Details H I towards the Lambda Orionis region H I towards the Lambda Orionis region

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1006z&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 1006-1012. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

12

H I Regions, H Ii Regions, Interstellar Matter, Radio Astronomy, Autocorrelation, Emission Spectra, Infrared Spectra, Interstellar Extinction, Orion Constellation

Scientific paper

Observations made with a resolution of 36 arcmin with the DRAO 26-m radio telescope of H I towards Lambda Orionis and its surrounding H II region S264 and large (diameter about 8 deg) dust ring are presented. A clear deficiency in the integrated H I emission corresponds to the interior of the dust ring. The amount of the 'missing' H I is about 6000 solar masses. This amount of mass is in good agreement with the amount of ionized material seen in the Lambda Orionis H II region. Although there are several H I clumps around the periphery of the dust ring, some of which correspond to CO peaks, it is clear that any H I shell corresponding to the ring is far from complete. The most striking H I emission feature associated with the dust ring is an arc in the west with a velocity near 0 km/s, which corresponds closely to the brightest IR dust emission and to the most strongly defined boundary of the H II region S264.

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