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Title:
Radio emission from chemically peculiar stars
Authors:
Linsky, Jeffrey L.; Drake, Stephen A.; Bastian, T. S.
Affiliation:
AA(Joint Institute for Laboratory Astrophysics, Boulder, CO), AB(NASA, Goddard Space Flight Center, Greenbelt, MD), AC(National Radio Astronomy Observatory, Socorro, NM)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 341-356. (ApJ Homepage)
Publication Date:
07/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Peculiar Stars, Radio Emission, Radio Sources (Astronomy), Stellar Luminosity, Very Large Array (Vla), Circular Polarization, Early Stars, Late Stars, Stellar Temperature, Stellar Winds
DOI:
10.1086/171509
Bibliographic Code:
1992ApJ...393..341L

Abstract

In five VLA observing runs the initial survey of radio emission from magnetic Bp-Ap stars by Drake et al. is extended to include a total of 16 sources detected at 6 cm out of 61 observed, giving a detection rate of 26 percent. Of these stars, three are also detected at 2 cm, four at 3.6 cm, and five at 20 cm. The 11 new stars detected as radio sources have spectral types B5-A0 and are He-weak and Si-strong. No classical (SrCrEu-type) Ap stars have yet been detected. The 16 detected sources show a wide range of radio luminosities with the early-B He-S stars on average 20 times more radio luminous than the late-B He-W stars and 1000 times more luminous than Theta Aurigae. Multifrequency observations indicate flat spectra in all cases. Four stars have a detectable degree of circular polarization at one or more frequencies. It is argued that the radio-emitting CP (chemically peculiar) stars form a distinct class of radio stars that differs from both the hot star wind sources and the active late-type stars. The observed properties of radio emission from these stars may be understood in terms of optically thick gyrosynchrotron emission from a nonthermal distribution of electrons produced in a current sheet far from the star. In this model the electrons travel along magnetic fields to smaller radii and higher magnetic latitudes where they mirror and radiate microwave radiation.

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