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New radio detections of early-type pre-main-sequence starsResults of VLA radio continuum observations of 13 early-type pre-main-sequence stars selected from the 1984 catalog of Finkenzeller and Mundt are presented. The stars HD 259431 and MWC 1080 were detected at 3.6 cm, while HD 200775 and TY CrA were detected at both 3.6 and 6 cm. The flux density of HD 200775 has a frequency dependence consistent with the behavior expected for free-free emission originating in a fully ionized wind. However, an observation in A configuration suggests that the source geometry may not be spherically symmetric. In contrast, the spectral index of TY CrA is negative with a flux behavior implying nonthermal emission. The physical mechanism responsible for the nonthermal emission has not yet been identified, although gyrosynchrotron and synchrotron processes cannot be ruled out.
Document ID
19900054760
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Skinner, Stephen L. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Brown, Alexander (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Linsky, Jeffrey L. (Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Date Acquired
August 14, 2013
Publication Date
July 10, 1990
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 357
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG5-82
Distribution Limits
Public
Copyright
Other