The nature of magnetic activity at the low-mass end of the main-sequence

Physics

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Stars, White Dwarfs, Solar System, Denis1048-39, Lp349-25, Lsr1835-3259, Lhs3003, Lhs2065, Xmm-Newton Proposal Id #05509805

Scientific paper

We propose a systematic investigation of magnetic activity on ultracool dwarfs at the spectral type M/L transition. XMM-Newton allows to trace the effects of both non-thermal and thermal processes in cool star atmospheres simultaneously, using EPIC to detect coronal X-rays and the Optical Monitor to record optical emission in response to non-thermal electrons. We selected a sample of nearby ultracool dwarfs known to maintain magnetic fields, and mostly yielding evidence for chromospheres. We aim at constraining the nature and efficiency of stellar dynamos and coronal heating at the bottom of the main-sequence by searching for the quiescent corona,establishing flare energy distributions, and studying the connection between chromospheric and coronal activity indicators.

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