Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99.1269b&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Dec. 1987, p. 1269-1276.
Astronomy and Astrophysics
Astronomy
16
Binary Stars, Infrared Spectra, Stellar Spectrophotometry, Supernova Remnants, Far Infrared Radiation, H Alpha Line, Infrared Astronomy Satellite, Spectrum Analysis, Visible Spectrum
Scientific paper
IRAS observations show SS 433 to be a weak but detectable infrared source at 12 microns and 25 microns. The midinfrared flux is consistent with a continuation of the spectrum at higher frequencies, although the spectrum flattens at low frequency. The resulting spectrum can be explained as the sum of a constant blackbody component and a variable optically thin free-free emission component. No variability is apparent; however, the timing of the observations does not preclude greater intrinsic variability than was observed. The surrounding W50 radio source is not apparent in the infrared, although there is a plateau of infrared emission to the north-northwest that includes the H II region S74. A number of knots with steep spectra can be identified which emit on the order of 10 to the 37th ergs/sec, if they are at the distance of SS 433. In particular, three infrared knots lie on the jet axis within W50 and two of these three knots bracket the western optical filament.
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