Other
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apl%26c..27..247s&link_type=abstract
Astrophysical Letters and Communications (ISSN 0888-6512), vol. 27, no. 4, 1988, p. 247-256.
Other
13
Microwave Spectra, Polarized Electromagnetic Radiation, Stellar Activity, Stellar Spectra, Brightness Temperature, Chromosphere, Optical Thickness, Stellar Luminosity, Very Large Array (Vla)
Scientific paper
Almost-simultaneous observations of 24 active-chromosphere stars with the VLA and the Parkes 64-m telescope at 4.9, 8.4 and 15 GHz over a 24-h interval on September 14, 1985 are reported. In all, 14 stars were detected. There is a striking difference in the power outputs and brightness temperatures of the higher-optical-luminosity stars (RS CVn, Algol-like and CAII emitters) and the low-luminosity dMe stars; this can be explained by differences in the surface areas and rotation velocities of the two groups of stars. Two three-point spectra show a broad peak in the region near 8.4 GHz, indicating a transition from optically thick to optically thin radio sources. For another three stars, two-point spectral indices are negative, indicating that their spectra peak probably well below 15 GHz; two stars with two-point positive spectral indices have higher-frequency turnovers, although perhaps below 15 GHz.
Bastian Tim S.
Dulk George A.
McKean M.
Nelson Graam J.
Slee Owen Bruce
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