Microwave observations of red dwarf flare stars |
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| Institution: | 1. Department of Physics-Chemistry, University of Puerto Rico-Arecibo, P.O. Box 4010, Arecibo, PR 00613-4010. USA;2. Department of Chemistry, University of Puerto Rico-Mayaguez, Call Box 9000, Mayaguez, PR 00681-900. USA;3. College of Pharmacy, University of Florida, Gainesville, FL 32611. USA;4. Universidad del Atlántico, Facultad de Ciencias Básicas, Barranquilla, 080002, Colombia;5. Life Science Research Center (CICV), Universidad Simón Bolivar, Barranquilla 080002, Colombia;1. Origins Lab, The University of Chicago, 5734 South Ellis Ave, Chicago, IL 60637, USA;2. Department of Space Studies, Southwest Research Institute, 1050 Walnut St., Suite 300, Boulder, CO 80302, USA;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;1. Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, NY 14853, USA;2. Planetary Science Institute, Tucson, AZ 85719, USA;3. NASA Ames Research Center, Moffett Field, CA 94035, USA |
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| Abstract: | We discuss some recent observations of red dwarf flare stars. When observed over periods of about 8 hours, each of 4 flare star systems displayed at least one major flare at 20 cm. Quiescent emission at 6 cm was seen from UV Ceti and EQ Peg A, but flares were much less frequent at 6 cm than at 20 cm. We also summarize earlier observations of quiescent emission from UV Ceti. Observations of highly polarized flares with brightness temperatures in excess of 1010 K appear to be common on red dwarf stars. We have also found narrowband flares which strengthen the argument that a coheren emission mechanism is involved in these flares. One of those narrowband flares allows us to place severe constraints on conditions in the flare source, and if the flare is cyclotron maser emission it seems unlikely that magnetic reconnection is involved in the flare. |
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