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A survey of circumstellar structure around young low mass stars

Published online by Cambridge University Press:  03 August 2017

S. Terebey ,
C. A. Beichman ,
T. N. Gautier ,
J. J. Hester ,
P. C. Myers  and
S. N. Vogel
S. Terebey
Affiliation:
Infrared Processing and Analysis Center and Palomar Observatory; Jet Propulsion Laboratory and California Institute of Technology, MS 100-22, Caltech, Pasadena CA 91125 E-mail ST@IPAC.CALTECH.EDU
C. A. Beichman
Affiliation:
Infrared Processing and Analysis Center and Palomar Observatory; Jet Propulsion Laboratory and California Institute of Technology, MS 100-22, Caltech, Pasadena CA 91125 E-mail ST@IPAC.CALTECH.EDU
T. N. Gautier
Affiliation:
Infrared Processing and Analysis Center and Palomar Observatory; Jet Propulsion Laboratory and California Institute of Technology, MS 100-22, Caltech, Pasadena CA 91125 E-mail ST@IPAC.CALTECH.EDU
J. J. Hester
Affiliation:
Infrared Processing and Analysis Center and Palomar Observatory; Jet Propulsion Laboratory and California Institute of Technology, MS 100-22, Caltech, Pasadena CA 91125 E-mail ST@IPAC.CALTECH.EDU
P. C. Myers
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., MS 42, Cambridge, MA 02138
S. N. Vogel
Affiliation:
Astronomy Program, University of Maryland, College Park, MD 20742

Abstract

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We present results from a near-infrared array, CO interferometer, and H 2 O maser interferometer survey of the circumstellar environments of 26 young low-luminosity embedded stars located in nearby molecular clouds. About 75% of the sample show evidence for stellar winds/outflows in the near-infrared or CO data indicating that most of these sources are in the early wind clearing phase of their evolution. Close to 15% are multiple on the scale of 20″, suggesting that fragmentation of their surrounding dense cloud cores is important before or during gravitational collapse. Roughly 10% have H 2 O maser emission and the kinematics imply the masers arise in gravitationally unbound gas (i.e., a stellar wind or outflow) rather than in a circumstellar disk.

Keywords

infrared sourcesstars-accretioncircumstellar gasstar formationpre-main-sequence starsstellar windsbinaries
Type
Early Stages of Stellar Evolution
Information
Symposium - International Astronomical Union , Volume 147: Fragmentation of Molecular Clouds and Star Formation , 1991 , pp. 345 - 352
Copyright
Copyright © Kluwer 1991 

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