Quiescent and flaring radio emission from the flare stars AD Leonis, EQ Pegasi, UV Ceti, Wolf 630, YY Geminorum and YZ Canis Minoris

Astronomy and Astrophysics – Astrophysics

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Flare Stars, Radio Emission, Red Dwarf Stars, Stellar Activity, Stellar Radiation, Binary Stars, Light Curve, Polarized Radiation, Time Dependence, Very Large Array (Vla)

Scientific paper

Observations of the flare stars AD Leo, EQ Peg, UV Cet, Wolf 630, YY Gem, and YZ CMi at 6 and 20 cm wavelengths are presented. These observations display how a sample of the more active radio flare stars behave over periods of several hours. An extensive time analysis at five minute resolution, to investigate the typical variability of these stars, is presented together with a ten-second-resolution time analysis for periods of enhanced activity. Highlights are the enhanced 6-cm activity from both components of the UV Ceti system, quiescent emission from UV Ceti at 20 cm (which has a higher flux than the quiescent emission at 6 cm), the possible detection of polarized quiescent emission, a 20-cm flare from AD Leo in which the polarization changes sign during the rise phase of the flare, and a relatively high level of 6-cm emission from AD Leo.

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