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Title:
Coordinated Einstein and IUE observations of a disparitions brusques type flare event and quiescent emission from Proxima Centauri
Authors:
Haisch, B. M.; Linsky, J. L.; Bornmann, P. L.; Stencel, R. E.; Antiochos, S. K.; Golub, L.; Vaiana, G. S.
Affiliation:
AA(Lockheed Research Laboratories, Palo Alto, CA), AB(Joint Institute for Laboratory Astrophysics; National Bureau of Standards, Quantum Physics Div., Boulder, CO), AC(Joint Institute for Laboratory Astrophysics, Boulder, CO), AD(Joint Institute for Laboratory Astrophysics, Boulder, CO), AE(Stanford University, Stanford, CA), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AG(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Osservatorio Astronomico, Palermo, Italy)
Publication:
Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 280-290. (ApJ Homepage)
Publication Date:
04/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Flare Stars, Heao 2, Iue, Stellar Coronas, Stellar Flares, X Ray Sources, Coronal Loops, Solar Corona, Stellar Luminosity, Stellar Temperature, Ultraviolet Spectra
DOI:
10.1086/160866
Bibliographic Code:
1983ApJ...267..280H

Abstract

The Einstein Imaging Particle Counter observed a major X-ray flare in its entirety during a 5-hr period of simultaneous observations, with the IUE, of the dM5e flare star Proxima Centauri in August, 1980. The detailed X-ray light curve, temperature determinations during various intervals, and UV line fluxes obtained before, during, and after the flare indirectly indicate a 'two-ribbon flare' prominence eruption. The calculated ratio of coronal to bolometric luminosity for the event is about 100 times the solar ratio. The Proxima Cen corona is analyzed in the context of static loop models, in light of which it is concluded that less than 6% of the stellar surface seems to be covered by X-ray emitting active regions.

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