A search for X rays from UV Ceti flare stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Light Emission, Stellar Radiation, X Ray Astronomy, X Ray Sources, Oso-7, Radiant Flux Density, Radio Emission

Scientific paper

A search of the MIT/OSO-7 data has been made for evidence of X-ray emission from flares of UV Ceti flare stars. Observations from McDonald Observatory have been used to identify the times of optical flares. The only instance of coincident coverage occurred on 1974, January 21, UT at 03:43:26 GMT for a flare of YZ CMi with a u magnitude increment of 0.86. No radio coverage of this particular event was obtained. Upper limits (3 sigma) of 0.8, 1.0, and 0.7 photons/sq cm sec on the observed X-ray flux have been set for the energy ranges greater than 15, greater than 3, and 1-10 keV, respectively.

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