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IRAS 16293-2422: A very young binary system?

Mundy, Lee G. and Wooten, Alwyn and Wilking, Bruce A. and Blake, Geoffrey A. and Sargent, Anneila I. (1992) IRAS 16293-2422: A very young binary system? Astrophysical Journal, 385 (1). pp. 306-313. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20120917-134214669

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Abstract

We present 4".5 x 2".5 resolution millimeter wavelength observations of the young far-infrared source IRAS 16293-2422 which resolve the continuum emission into two sources, MM 1 and MM 2. These sources coincide with known radio continuum sources and may constitute a very young binary system with a projected separation of 840 AU. Flux measurements from 18 cm to 25 μm show that the majority of the millimeter wavelength emission arises from dust within 300 AU of the individual central objects. The total dynamical mass of 1.1-1.3 M_⊙, coupled with our mass estimates for MM 1 and MM 2, suggests that the mass in circumstellar material is comparable to that of the central stellar cores. Since the stellar masses are constrained to be ≤ 0.5 M_⊙ each, it is likely that the bolometric luminosity of 30-40 L_⊙ is derived mainly from accretion of the observed circumstellar material. Maps of the J = 2, 3-1, 2 transition of SO obtained simultaneously show that this emission is centered on MM 1, with weaker emission in a clumpy distribution to the east and west. No SO emission is detected toward MM 2, indicating an upper limit to the fractional abundance which is a factor of 10 below that toward MM 1. We propose that the SO emission toward MM 1 is a result of the outflow activity associated with this source and that the outlying emission clumps trace regions of mild interaction between the outflow and the ambient cloud.


Item Type:Article
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http://dx.doi.org/10.1086/170939DOIUNSPECIFIED
http://adsabs.harvard.edu/doi/10.1086/170939PublisherUNSPECIFIED
Additional Information:© 1992 American Astronomical Society. Received 1991 February 14; accepted 1991 July 22. We would like to thank the Owens Valley staff for their assistance in the observations. We thank Karl Menten and Doug Wood for helpful discussions and the referee for helpful comments. B. A. W. would like to thank C. J. Lada and J. M. Moran for their generosity during his visit at CfA. G. A. B. would like to acknowledge support from the Packard and Sloan Foundations. The OVRO millimeter interferometer is supported by NSF grant AST 87-14405 to Caltech.
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Funding AgencyGrant Number
Packard FoundationUNSPECIFIED
Sloan FoundationUNSPECIFIED
Subject Keywords:circumstellar matter; infrared: stars; stars: individual (IRAS 16293- 2422); stars: pre-main-sequence
Record Number:CaltechAUTHORS:20120917-134214669
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120917-134214669
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34147
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:18 Sep 2012 14:47
Last Modified:26 Dec 2012 16:11

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