Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254....1b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 1, 1992, p. 1-6.
Astronomy and Astrophysics
Astronomy
6
Main Sequence Stars, Nonthermal Radiation, Radio Emission, Radio Sources (Astronomy), Radio Spectra, Stellar Activity, Giant Stars, Stellar Magnetic Fields
Scientific paper
The Australia Telescope Compact Array (ATCA) has been used to make 4.8-GHz observations of 24 fields containing post-main-sequence stars. These stars were selected from a sample of late-type (spectral types G, K and M) giants and bright giants within 30 pc claimed by Slee et al., from observations with the Parkes radio telescope, to be variable non-thermal radio emitters. No significant 4.8-GHz radio emission was detected from these stars. Non-detection of any stars with the ATCA is an improbable result, and calls for a re-analysis of the original Parkes 8.4-GHz observations. A re-analysis suggests that the majority of the claimed Parkes detections with S less than about 8 mJy are false. The five claimed Parkes detections with S greater than 8 mJy are discussed individually on the basis of the ATCA and Molonglo Observatory Synthesis Telescope (MOST) observations. It is concluded that the Parkes, ATCA, and MOST observations do not invalidate the concept of a 'coronal boundary line' between stars exhibiting chromospheric and coronal emission, and more evolved stars displaying only cool winds.
Beasley Anthony J.
Carter Brad D.
Stewart Ron T.
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