First dynamic spectra of stellar microwave flares

Details First dynamic spectra of stellar microwave flares First dynamic spectra of stellar microwave flares

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.326..678b&link_type=abstract

Nature (ISSN 0028-0836), vol. 326, April 16, 1987, p. 678-680.

Other

51

Circular Polarization, Microwave Emission, Plasma Radiation, Red Dwarf Stars, Stellar Flares, Stellar Spectra, Masers, Radiant Flux Density, Solar Corona, Stellar Magnetic Fields

Scientific paper

The VLA has been used in the spectral-line mode at 1.4 GHz to obtain the first dynamic spectra of stellar sources other than the sun. Two very intense, highly circularly polarized, microwave outbursts were observed on the dMe flare star UV Cet, in addition to a slowly varying, unpolarized component. One outburst was purely left circularly polarized and showed no variations as a function of frequency across the 41 MHz band, whereas the other was as much as 70 percent right-circularly polarized and showed distinct variations with frequency. Although the slowly varying emission is probably due to incoherent gyrosynchrotron emission, the two flaring events are the result of coherent mechanisms. The coherent emission is interpreted in terms of plasma radiation and the cyclotron maser instability.

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