000001967 001__ 1967
000001967 005__ 20160701171656.0
000001967 0247_ $$2DOI$$a10.1051/0004-6361:20034283
000001967 037__ $$aASTROimport-124
000001967 100__ $$aBagnulo, S.
000001967 245__ $$aDiscovery of a huge magnetic field in the very young star NGC 2244-334 in the Rosette Nebula cluster
000001967 260__ $$c2004
000001967 520__ $$aDuring a survey of field strengths in upper main sequence stars in open clusters, we observed the star NGC 2244-334 in the Rosette Nebula cluster and discovered an extraordinarily large mean longitudinal field of about -9 kG, the second largest longitudinal field known in a non-degenerate star. This star appears to be a typical Ap He-wk (Si) star of about 4 M?. Spectrum synthesis using a line synthesis code incorporating the effects of the strong magnetic field indicates that He is underabundant by about 1.5 dex, and C, O and Mg by about 0.1-0.4 dex, while Si, Mn and Fe are overabundant by about 1 dex, and Cr and Ti are nearly 2 dex overabundant. Cluster membership for this star is secure, so its age is about 2× 106 yr, which is less than 3% of its main sequence lifetime. This star is one of the very youngest magnetic upper main sequence stars with a well-determined age, and confirms that both magnetic fields and strong chemical peculiarity can appear in stars which are both extremely young and very close to the ZAMS. This paper is based on data obtained at the European Southern Observatory VLT during observing runs 70.D-0352 and 270.D-5032. 
000001967 700__ $$a Hensberge, H.
000001967 700__ $$a Landstreet, J. D.
000001967 700__ $$a Szeifert, T.
000001967 700__ $$a Wade, G. A.
000001967 773__ $$c1149-1158$$pAstronomy and Astrophysics$$v416$$y2004
000001967 85642 $$ahttp://esoads.eso.org/abs/2004A%26A...416.1149B
000001967 905__ $$apublished in
000001967 980__ $$aREFERD