000002476 001__ 2476
000002476 005__ 20160701171706.0
000002476 037__ $$aASTROimport-633
000002476 100__ $$aBriquet, M.
000002476 245__ $$aSurface Mapping of the he  SI Distribution of Four B Stars
000002476 260__ $$c2003
000002476 520__ $$aIn the framework of a long-term high-resolution spectroscopic monitoring campaign of slowly pulsating B stars we have discovered four spotted mid-B main-sequence stars exhibiting clear line-profile variability of selected He and Si lines. We derive the rotational period which is of the order of 1-2 days of these stars with a high precision. We perform surface mapping which allows us to derive the distribution of the helium and silicon on the stellar surface. We find evidence for the presence of large spots in all four stars. He overabundance is accompanied with Si underabundance or vice versa in the spots. Our data are usefull to test current diffusion theories which have been developed for spotted A-type stars. Our stars have effective temperatures around 17000K which makes them among the hottest known so far with such clear spotted patterns. It would be most valuable to have magnetic field measurements for the four stars in order to explain the surface element distribution. 
000002476 700__ $$a Luftinger, T.
000002476 700__ $$a Aerts, C.
000002476 700__ $$a De Cat, P.
000002476 773__ $$pIAU Joint Discussion$$v9$$y2003
000002476 85642 $$ahttp://esoads.eso.org/abs/2003IAUJD...9E..23B
000002476 905__ $$apublished in
000002476 980__ $$aNONREF