Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.334..329p&link_type=abstract
Nature (ISSN 0028-0836), vol. 334, July 28, 1988, p. 329-331. NSF-NASA-supported research.
Astronomy and Astrophysics
Astronomy
28
B Stars, Nonthermal Radiation, Peculiar Stars, Radio Emission, Stellar Radiation, Astrometry, Brightness Temperature, Radiant Flux Density, Stellar Spectra, Very Long Base Interferometry
Scientific paper
Some stars hotter than 10,000 K show propensity for unusual surface abundances and excessive magnetic fields. These peculiar stars, Ap and Bp in the spectral nomenclature, show unusually prominent absorption lines of heavier elements. Rapid rotation and strong magnetic fields are revealed by line shapes and Zeeman splitting. VLBI is here used to directly probe the source size and brightness temperature of weak radio emission recently discovered from two isolated Bp stars, sigma Orionis E and HD37017. The emitting zone for each star is no more than 6 stellar diameters in extent, reflecting brightness temperatures of more than one billion K. Such high surface brightness resembles gyrosynchrotron radiation from mildly relativistic electrons trapped in the strong magnetic fields surrounding these stars. Compact radio radiation from these two stars presents new opportunities for probing the physical environments of early-type stars and for precise radio astrometry.
Lestrade Jean-Francois
Phillips Robert B.
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