view Abstract Citations (11) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Multiwavelength Study of IRAS 19550+3248: A Protostar Possibly Formed by a Cloud-Cloud Collision Koo, Bon-Chul ; Lee, Youngung ; Fuller, G. A. ; Lee, Myung Gyoon ; Kwon, Suk-Minn ; Jung, Jae-Hoon Abstract We have carried out radio, near-infrared, and optical observations of the IRAS point source IRAS 19550+3248. (12)CO J = 1-0 line observations revealed a high-velocity (HV) molecular outflow centered on IRAS 19550+ 3248. The HV gas has a bipolar pattern with the blue and red peaks separated by 1 arcmin along the north-south direction. The mechanical luminosity of the HV molecular outflow is approximately 9 x 1031d2 ergs/s, and its dynamical age is approximately 5 x 104d2 yr, where d2 is the distance to the source normalized to 2 kpc. Inside the 95% confidence ellipse of IRAS position, we have detected a nebulous K band source. The nebulosity extends to 0.1d2 pc in the east-west direction. In R and I bands, the source appears to be composed of two extended weak peaks shifted toward the blueshifted CO lobe from the peak position K band. These near-infrared emission features are likely scattered stellar light. The infrared source has a steep spectral index between 2 and 25 microns (d log nuFnu/d log nu = -0.93), which indicates that it is a protostar deeply embedded in a dense molecular cloud core. The bolometric luminosity based on R, I, H, and K band photometry together with the IRAS data is 150d2 exp 2 Solar Luminosities. IRAS 19550+3248 islocated at the center of a small (4 arcmin x 7 arcmin) dense molecular clump. The clump is at the tip of a long (approximately 1 deg) filmentary molecular cloud. The molecular cloud is composed of clumps which are not confined by gravity and nor, probably, by external pressure. The characteristic timescale for dispersal is approximately 6 x 106 yr. We suggest cloud-cloud collision as a possible mechanism for the disruption of the cloud and for the formation of IRAS 19550+3248. Publication: The Astrophysical Journal Pub Date: July 1994 DOI: 10.1086/174314 Bibcode: 1994ApJ...429..233K Keywords: Molecular Clouds; Nebulae; Protostars; Star Formation; Carbon Monoxide; Collision Parameters; Extragalactic Radio Sources; Infrared Astronomy Satellite; Astrophysics; INFRARED: ISM: CONTINUUM; ISM: CLOUDS; ISM: INDIVIDUAL ALPHANUMERIC: IRAS 19550; 3248; ISM: MOLECULES; RADIO LINES: ISM; STARS: FORMATION full text sources ADS | data products SIMBAD (2)