000002796 001__ 2796
000002796 005__ 20160701171711.0
000002796 037__ $$aASTROimport-953
000002796 100__ $$aMartayan, C.
000002796 245__ $$aMassive Be and Oe stars at low metallicity and long gamma ray bursts
000002796 260__ $$c2012
000002796 520__ $$aAccording to recent theoretical studies, the progenitors of Long Gamma Ray Bursts should be very fast rotating stars, massive enough but not so for collapsing into a black hole. In addition, recent observations seem to show that stars of about 20 solar masses could be at the origin of LGRBs. At low metallicity B-type stars rotate faster than at higher metallicity. We found with the ESO-WFI an occurrence of Be/Oe stars, that are quasi critical rotators, 3 to 5 times larger in the SMC than in the Galaxy. According to our results, and using observational clues on the SMC WR stars, as well as the theoretical predictions of the characteristics must have the LGRB progenitors, we have identified the low metallicity massive Be/Oe stars as potential LGRB progenitors. To support this identification, the expected rates and the numbers of LGRB were then calculated and compared to the observed ones: 3 to 6 LGRBs were found in the local universe in 11 years while 8 were actually observed. 
000002796 700__ $$a Zorec, J.
000002796 700__ $$a Baade, D.
000002796 700__ $$a Frémat, Y.
000002796 700__ $$a Ekström, S.
000002796 700__ $$a Fabregat, J.
000002796 773__ $$c34$$pMemorie della Societa Astronomica Italiana Supplementi$$v21$$y2012
000002796 85642 $$ahttp://esoads.eso.org/abs/2012MSAIS..21...34M
000002796 905__ $$apublished in
000002796 980__ $$aNONREF