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The discovery of nonthermal radio emission from magnetic Bp-Ap stars

DOI

78

Citations

0

References

1987

Year

S. A. Drake, D. C. Abbott, T. S. Bastian, J. H. Bieging, E. Churchwell, G. A. Dulk, Jeffrey L. Linsky
The Astrophysical Journal

Abstract

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.