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The discovery of nonthermal radio emission from magnetic Bp-Ap stars
Drake, Stephen A.; Abbott, David C.; Bastian, T. S.; Bieging, J. H.; Churchwell, E.; Dulk, G.; Linsky, Jeffrey L.
AA(Joint Institute for Laboratory Astrophysics, Boulder, CO), AB(Joint Institute for Laboratory Astrophysics, Boulder, CO), AC(Colorado, University, Boulder), AD(California, University, Berkeley), AE(Washburn Observatory, Madison, WI)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 902-908. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
A Stars, B Stars, Emission Spectra, Magnetic Stars, Nonthermal Radiation, Peculiar Stars, Radio Sources (Astronomy), Magnetic Field Configurations, Radio Emission, Stellar Radiation, Stellar Spectrophotometry, Thermal Radiation, Very Large Array (Vla)
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In 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.

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