000002295 001__ 2295
000002295 005__ 20160706141923.0
000002295 0247_ $$2DOI$$a10.1051/0004-6361/200913079
000002295 037__ $$aASTROimport-452
000002295 100__ $$aMartayan, C.
000002295 245__ $$aCan massive Be/Oe stars be progenitors of long gamma ray bursts?
000002295 260__ $$c2010
000002295 520__ $$aContext. The identification of long-gamma-ray-bursts (LGRBs) is still uncertain, although the collapsar engine of fast-rotating massive stars is gaining a strong consensus.  Aims: We propose that low-metallicity Be and Oe stars, which are massive fast rotators, as potential LGRBs progenitors.  Methods: We checked this hypothesis by 1) testing the global specific angular momentum of Oe/Be stars in the ZAMS with the SMC metallicity; 2) comparing the ZAMS (Ω/Ωc,M/M⊙) parameters of these stars with the area predicted theoretically for progenitors with metallicity Z = 0.002; and 3) calculating the expected rate of LGRBs/year/galaxy and comparing them with the observed ones. To this end, we determined the ZAMS linear and angular rotational velocities for SMC Be and Oe stars using the observed V sin i parameters, corrected from the underestimation induced by the gravitational darkening effect. Results: The angular velocities of SMC Oe/Be stars are on average
000002295 700__ $$aZorec, J.
000002295 700__ $$aFrémat, Y.
000002295 700__ $$aEkström, S.
000002295 773__ $$cA103$$pAstronomy and Astrophysics$$v516$$y2010
000002295 85642 $$ahttp://esoads.eso.org/abs/2010A%26A...516A.103M
000002295 905__ $$apublished in
000002295 980__ $$aREFERD