Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.2203d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 108, no. 6, p. 2203-2206
Astronomy and Astrophysics
Astronomy
7
Peculiar Stars, Radio Astronomy, Radio Emission, Stellar Luminosity, Stellar Magnetic Fields, Stellar Magnetospheres, Correlation, Data Processing, Helium, Silicon, Stellar Temperature, Very Large Array (Vla)
Scientific paper
We have observed 23 members of the Am and HgMn subclasses of chemically peculiar (CP) stars with the Very Large Array (VLA) to search for nonthermal radio emission at levels comparable to those found for the Si and He peculiar subclasses of the CP stars by Linsky et al. (1992). This study was motivated by recent claims that magnetic fields of kilogauss strength are present in at least some of the Am and HgMn stars, contrary to previous beliefs, which would indicate that radio-emitting magnetospheres could be present in these stars. We detected none of the Am and HgMn stars as radio emitters with upper limits typically less than 0.20 mJy. Applying a correlation between radio luminosity, surface magnetic field, and effective temperature derived from previous radio studies of the Si and He peculiar CP stars, we find that the predicted radio luminosities of alpha And (an HgMn star) and Sirius (a hot Am star) are more than an order of magnitude larger than the observed upper limits, indicating that these stars lack magnetospheres, and, by inference, surface magnetic fields.
Bookbinder Jay A.
Drake Stephen Alan
Linsky Jeffrey L.
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