A microwave survey of southern red giants

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Late Stars, Microwave Emission, Red Giant Stars, Stellar Rotation, Stellar Spectra, Astronomical Catalogs, G Stars, K Stars, M Stars

Scientific paper

The Parkes 64-m telescope has been used to survey a complete sample of nearby red giants. The sample consisted of all 82 stars within 30 pc in the Bright Star Catalogue having spectral types G, K, M and luminosity classes I, II, III and occurring south of the celestial equator. Twenty-four stars, consisting of 19 G or K giants, two G or K bright giants (luminosity class II) and three of the five M-type giants were detected in the sample. The emitted 8.4-GHz power and surface flux distributions of the 24 detections have medians two orders of magnitude lower than those of the active radio emitters in close binaries and other rapidly rotating single stars. It is shown that the field red giants with their low rotation velocities probably fit into the surface-flux/rotation-velocity relation derived for the faster rotators.

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