Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..765l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 195, June 1981, p. 765-774.
Astronomy and Astrophysics
Astronomy
5
Astronomical Photometry, Hydroxyl Emission, Infrared Astronomy, Nebulae, Radio Sources (Astronomy), Carbon Monoxide, Hydrogen Clouds, Photographic Plates, Red Giant Stars, Star Clusters, Stellar Evolution
Scientific paper
The detection of three infrared sources, measured at the wavelength of 2.25 microns by a 77 K SbIn photometer, is reported. Cooled diaphragms yielded sky apertures from 6.3 to 25.2 arcsec and a 64 arcsec beam separation was adopted. IRS 1 is coincident with the radio continuum and maser sources of ON 1; IRS 2 is coincident with the CO peak; and IRS 3 is located about 1.8 arcmin south-east of the CO peak. The sizes of the three infrared sources at the wavelength of 2.25 microns, and the 1.27-3.95 micron energy distribution of IRS 3 are presented. The infrared sources IRS 1 and 2 are very faint, and they both have comparable fluxes, but the spectral slope of IRS 1 is significantly redder than the one observed for IRS 2. A model for IRS 1 and IRS 2 could be emission from dust clouds, powered by embedded sources, while IRS 3 could be a reddened cool giant star, possibly connected with the CO cloud. During the exploration of the S 156 region at 2.25 microns, an infrared source (G 110.25 plus 0.01, IRS 1) was detected, which is very close to the secondary peak observed by Blair et al. (1975).
Bergeat J.
Garnier R.
Lunel M.
Sibille Francois
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