An unusual microwave flare with 56 second oscillations on the M dwarf L726-8 A

Details An unusual microwave flare with 56 second oscillations on the M dwarf L726-8 A An unusual microwave flare with 56 second oscillations on the M dwarf L726-8 A

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263l..79g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 263, Dec. 15, 1982, p. L79-L83.

Astronomy and Astrophysics

Astrophysics

48

Dwarf Stars, Flare Stars, Late Stars, Microwave Emission, Stellar Flares, Stellar Oscillations, Brightness Temperature, Circular Polarization, Flux (Rate), Masers, Radio Emission, Stellar Radiation

Scientific paper

Using the VLA, an unusual flare event has been observed on L726-8 A (dM5.5e), the primary star in the M dwarf system containing the prototype flare star UV Cet. This flare had a peak flux of 8 mJy at 6 cm and a corresponding brightness temperature greater than 10 to the 10th K, was almost entirely right-hand circularly polarized, showed large flux variations on the 10 s time resolution of the VLA, and exhibited quasi-periodic oscillations with a period of about 56 + or - 5 s. While periodic flux variations have been detected during solar flares and RS CVn type stellar flares, this is apparently the first detection of periodicity in microwaves from M dwarf stars. It is proposed that the observed radiation was due to maser action, probably an electron maser, and that the energy release mechanism was modulated.

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