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The discovery of nonthermal radio emission from magnetic Bp-Ap starsIn a VLA survey of chemically peculiar B- and A-type stars with strong magnetic fields, five of the 34 stars observed have been identified as 6 cm continuum sources. Three of the detections are helium-strong early Bp stars (Sigma Ori E, HR 1890, and Delta Ori C), and two are helium weak, silicon-strong stars with spectral types near A0p (IQ Aur = HD 34452, Babcock's star = HD 215441). The 6 cm luminosities L6 (ergs/s Hz) range from log L6 = 16.2 to 17.9, somewhat less than the OB supergiants and W-R stars. Three-frequency observations indicate that the helium-strong Bp stars are variable nonthermal sources.
Document ID
19880031879
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Drake, Stephen A.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Abbott, David C.
(Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Bastian, T. S.
(Colorado, University Boulder, United States)
Bieging, J. H.
(California, University Berkeley, United States)
Churchwell, E.
(Washburn Observatory Madison, WI, United States)
Date Acquired
August 13, 2013
Publication Date
November 15, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 322
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A19106
Funding Number(s)
CONTRACT_GRANT: NSF AST-79-05578
CONTRACT_GRANT: NAGW-766
CONTRACT_GRANT: NSF AST-86-05125
CONTRACT_GRANT: NGL-06-003-057
CONTRACT_GRANT: NSF AST-85-05919
Distribution Limits
Public
Copyright
Other

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