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The X-Ray Flare of π UMA : Temperature and Emission Measure

Published online by Cambridge University Press:  27 September 2017

M. Landini  and
B.C. Monsignori Fossi
M. Landini
Affiliation:
Department of Physics, University of Napoli, Italy
B.C. Monsignori Fossi
Affiliation:
Arcctri Astrophysical Observatory, Florence, Italy

Abstract

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An X-ray flare from the star π UMA has been observed by EXOSAT on January 31, 1984. The data were collected using the-Low Energy Experiment and the Medium Energy Experiment, sensitive to the spectral bands 0.04 - 2 Kev and 1-20 Kev (Landini et al. 1986).

The temperature and emission measure variations during the flare are deduced under the isothermal assumption. Using a parametrized profile of the differential emission measure, wich is controlled by the conductive flux via the temperature gradient, the comparison with the observed data gives some insight on a “mean loop” model and its power supply.

Type
Session I: Stellar Flares
Information
International Astronomical Union Colloquium , Volume 104 , Issue 2: Solar and Stellar Flares , 1989 , pp. 127 - 130
Copyright
Copyright © Kluwer 1989

References

Landini, M., Monsignori Fossi, B.C.: 1979, Astr. and Astroph., 72, 171 Google Scholar
Landini, M., Munsignori Fossi, B.C., Pallavicini, R., Piro, L.: 1986, Astr. and Astroph. 157, 217 Google Scholar
Monsignori Fossi, B.C., Landini, M. : 1988, in “Activity in cool star envelopes”, ed. (Havens, O. et al. ed.) 237 Google Scholar
Pallavicini, R., Monsignori Fossi, B.C., Landini, M. and Schmitt, J.H.M.M.: 1988, Astr.and Astroph. 191, 109 Google Scholar