Volume 416, Number 3, March IV 2004
|Page(s)||1149 - 1158|
|Published online||09 March 2004|
Discovery of a huge magnetic field in the very young star NGC 2244-334 in the Rosette Nebula cluster
European Southern Observatory, Casilla 19001, Santiago 19, Chile e-mail: email@example.com
2 Royal Observatory of Belgium, Ringlaan 3, 1180 Brussel, Belgium e-mail: Herman.Hensberge@oma.be
3 Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada e-mail: firstname.lastname@example.org
4 Department of Physics, Royal Military College of Canada, PO Box 17000, Station “Forces”, Kingston, Ontario K7K 7B4, Canada e-mail: Gregg.Wade@rmc.ca
Corresponding author: S. Bagnulo, email@example.com
Accepted: 9 December 2003
During 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 . 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 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.
Key words: polarization / stars: abundances / stars: chemically peculiar / stars: magnetic fields / stars: individual: NGC 2244-334
© ESO, 2004
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