Astronomy & Astrophysics, 304, L13, (1995)
P1724 is not a clear proper motion member to the Orion nebula association and, hence, its distance is not well established, but we present new spectroscopic and photometric evidence indicating that P1724 is a weak-line TTS associated with the Orion star forming region. For a distance of 500 pc, the total flare energy radiated in the ROSAT X-ray band (0.1 - 2.4 keV) is more than 5 x 10^37 erg. This is an order of magnitude above the highest energies of flares on young stars found so far, making this event the largest X-ray flare ever observed on a star.
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