000002019 001__ 2019
000002019 005__ 20160701171657.0
000002019 0247_ $$2DOI$$a10.1051/0004-6361:20065076
000002019 037__ $$aASTROimport-176
000002019 100__ $$aMartayan, C.
000002019 245__ $$aEffects of metallicity, star-formation conditions, and evolution in B and Be stars. II. Small Magellanic Cloud, field of NGC?330
000002019 260__ $$c2007
000002019 520__ $$aAims:We search for the effects of metallicity on B and Be stars in the Small and Large Magellanic Clouds (SMC and LMC) and in the Milky Way (MW), by extending our previous analysis of B and Be star populations in the LMC to the SMC. The rotational velocities of massive stars and the evolutionary status of Be stars are examined with respect to their environments.  Methods: Spectroscopic observations of hot stars belonging to the young cluster SMC-NGC 330 and its surrounding region were obtained with the VLT-GIRAFFE facilities in MEDUSA mode. We determined fundamental parameters for B and Be stars with the GIRFIT code, taking the effect of fast rotation and the age of observed clusters into account. We compared the mean V sin i obtained by spectral type- and mass-selection for field and cluster B and Be stars in the SMC with the one in the LMC and MW.  Results: We find that (i) B and Be stars rotate faster in the SMC than in the LMC and in the LMC than in the MW; (ii) at a given metallicity, Be stars begin their main sequence life with a higher initial rotational velocity than B stars. Consequently, only a fraction of the B stars that reach the ZAMS with a sufficiently high initial rotational velocity can become Be stars; (iii) the distributions of initial rotational velocities at the ZAMS for Be stars in the SMC, LMC, and MW are mass- and metallicity-dependent; (iv) the angular velocities of B and Be stars are higher in the SMC than in the LMC and MW; (v) in the SMC and LMC, massive Be stars appear in the second part of the main sequence, in contrast to massive Be stars in the MW. Tables 1-6, 8 and 11 are only available in electronic form at http://www.aanda.org 
000002019 700__ $$a Frémat, Y.
000002019 700__ $$a Hubert, A.-M.
000002019 700__ $$a Floquet, M.
000002019 700__ $$a Zorec, J.
000002019 700__ $$a Neiner, C.
000002019 773__ $$c683-694$$i2$$pAstronomy and Astrophysics$$v462$$y2007
000002019 85642 $$ahttp://esoads.eso.org/abs/2007A%26A...462..683M
000002019 905__ $$apublished in
000002019 980__ $$aREFERD