The nature of the radio and infrared sources in S140

Details The nature of the radio and infrared sources in S140 The nature of the radio and infrared sources in S140

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..212e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 212-219.

Astronomy and Astrophysics

Astronomy

54

Infrared Sources (Astronomy), Molecular Clouds, Nebulae, Radio Sources (Astronomy), B Stars, H Ii Regions, Main Sequence Stars, Radio Emission, Stellar Mass, Very Large Array (Vla)

Scientific paper

Observations of the S140 molecular cloud have been obtained with the VLA at 6 and 2 cm and with the KPNO infrared camera at 1.2, 1.65, and 2.2 microns. Radio continuum emission is seen from all three mid-infrared sources, IRS 1, 2, and 3. The near-infrared images show IRS 1 and 3 very clearly, but IRS 2 is not detected. Two additional radio sources not associated with mid-infrared sources, but coincident with strong, scattered, near-infrared emission, are probably clumps of shock-ionized gas, whose associated dust is illuminated by photons escaping through holes in the dense material around IRS 1. The near-infrared emission from IRS 1 and 3 is too strong to come from the stellar photospheres; instead it must be emission from hot dust grains. The absence of IRS 2 from the near-infrared images implies that the extinction toward IRS 2 must be much larger than the average. A substantial number of weaker sources are seen at 2 microns in the vicinity of IRS 1, indicating that many lower mass stars are also forming in the region.

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