Discovery of Microwave Emission from Four Nearby Solar-Type G Stars

Radio waves from the sun were detected 50 years ago, but the microwave detection of other single solar-type stars has remained a challenge. Here, the discovery of four solar-type radio stars is reported. These "solar twin" G stars are radio sources up to 3000 times stronger than the quiet...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1994-08, Vol.265 (5174), p.933-935
Main Authors: Güdel, Manuel, Jürgen H. M. M. Schmitt, Benz, Arnold O.
Format: Article
Language:English
Subjects:
Astronomy
Dwarf stars
Earth, ocean, space
Exact sciences and technology
Extraterrestrial radiation
G stars
Main sequence stars
Main-sequence: late-type stars (g, k, and m)
Microwave emission
Microwaves
Normal stars (by class): general or individual
Radiation
Radio emission
Radio stars
Stars
Stellar luminosities
Sun
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Summary:Radio waves from the sun were detected 50 years ago, but the microwave detection of other single solar-type stars has remained a challenge. Here, the discovery of four solar-type radio stars is reported. These "solar twin" G stars are radio sources up to 3000 times stronger than the quiet sun. The microwaves most likely originate from a large number of relativistic electrons, possibly produced along with coronal heating, a process that is not understood. Two of the stars are younger than the sun and rotate more rapidly; the dynamo process in the stellar interior is therefore presumably more vigorous, resulting in enhanced coronal activity. One of the detections, however, is an old, metal-deficient G dwarf.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.265.5174.933