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A Search for Disks around Massive Young Stellar Objects

Published online by Cambridge University Press:  23 September 2016

A. G. Gibb ,
M. G. Hoare ,
L. G. Mundy  and
F. Wyrowski
A. G. Gibb
Affiliation:
Univ of Maryland, Dept of Astronomy, College Park, MD 20742, USA
M. G. Hoare
Affiliation:
Univ of Leeds, Dept of Physics and Astronomy, Leeds, LS2 9JT, UK
L. G. Mundy
Affiliation:
Univ of Maryland, Dept of Astronomy, College Park, MD 20742, USA
F. Wyrowski
Affiliation:
Max Planck Institut für Radioastronomie, Auf dem Hügel 69, Bonn D-53121, Germany

Abstract

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We present subarcsecond observations at 2.7 and 1.4 mm of a sample of massive young stellar objects made with the BIMA millimetre array. For most sources the continuum emission on the smallest scales at 2.7 mm is dominated by free-free emission from the stellar wind or jet. Strong emission at 1.4 mm shows the presence of significant dust associated with Cep A and GL 490 but our resolution is not sufficient to resolve any structure. The 2.7-mm emission from GL 490 is resolved but it is not clear whether we are seeing a single circumstellar disk or a secondary companion, although near-infrared data support the disk hypothesis. Estimates of the dust mass yield values of ∼1–4 M⊙ within radii of 150 to 1000 AU.

Type
Part 8: Disks
Information
Symposium - International Astronomical Union , Volume 221: Star Formation at High Angular Resolution , 2004 , pp. 425 - 430
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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