Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279l..33p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 2, p. L33-L36
Astronomy and Astrophysics
Astronomy
54
Space Plasmas, Spaceborne Astronomy, Stellar Flares, Stellar Models, Stellar Spectra, T Tauri Stars, X Ray Astronomy, X Ray Spectra, Astronomical Spectroscopy, Light Curve, Mathematical Models, Proportional Counters, Rosat Mission, Stellar Luminosity
Scientific paper
We report the detection of a giant X-ray flare on the classical T Tauri star LkH-alpha 92 with the ROSAT Position Sensitive Proportional Counter (PSPC). In this flare the PSPC count rate rose by a factor of more than 100 in a time interval of about 2000 sec. Our X-ray observations cover most of the rise phase as well as part of the decay phase of the flare. We model the X-ray spectra obtained at different flare phases to determine temperature and emission measure of the flaring plasma. Combining the thus derived X-ray luminosity with the observed decay time scale of approximately = 7800 sec, we estimate the total energy release of the flare in the ROSAT PSPC band (0.1 - 2.4 keV) to be approximately = 4 x 1036 erg, which is more than a factor of 104 greater than the energy release in the strongest solar flares and still more than a factor of 100 greater than that in typical fares on T Tauri stars.
Preibisch Th.
Schmitt Juergen H. M. M.
Zinnecker Hans
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