000002088 001__ 2088
000002088 005__ 20160701171658.0
000002088 0247_ $$2DOI$$a10.1038/ncomms11058
000002088 037__ $$aASTROimport-245
000002088 100__ $$aKaroff, C.
000002088 245__ $$aObservational evidence for enhanced magnetic activity of superflare stars
000002088 260__ $$c2016
000002088 520__ $$aSuperflares are large explosive events on stellar surfaces one to six orders-of-magnitude larger than the largest flares observed on the Sun throughout the space age. Due to the huge amount of energy released in these superflares, it has been speculated if the underlying mechanism is the same as for solar flares, which are caused by magnetic reconnection in the solar corona. Here, we analyse observations made with the LAMOST telescope of 5,648 solar-like stars, including 48 superflare stars. These observations show that superflare stars are generally characterized by larger chromospheric emissions than other stars, including the Sun. However, superflare stars with activity levels lower than, or comparable to, the Sun do exist, suggesting that solar flares and superflares most likely share the same origin. The very large ensemble of solar-like stars included in this study enables detailed and robust estimates of the relation between chromospheric activity and the occurrence of superflares. 
000002088 700__ $$a Knudsen, M. F.
000002088 700__ $$a De Cat, P.
000002088 700__ $$a Bonanno, A.
000002088 700__ $$a Fogtmann-Schulz, A.
000002088 700__ $$a Fu, J.
000002088 700__ $$a Frasca, A.
000002088 700__ $$a Inceoglu, F.
000002088 700__ $$a Olsen, J.
000002088 700__ $$a Zhang, Y.
000002088 700__ $$a Hou, Y.
000002088 700__ $$a Wang, Y.
000002088 700__ $$a Shi, J.
000002088 700__ $$a Zhang, W.
000002088 773__ $$c11058$$pNature Communications$$v7$$y2016
000002088 85642 $$ahttp://esoads.eso.org/abs/2016NatCo...711058K
000002088 905__ $$apublished in
000002088 980__ $$aREFERD