Issue |
A&A
Volume 416, Number 3, March IV 2004
|
|
---|---|---|
Page(s) | 1149 - 1158 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361:20034283 | |
Published online | 09 March 2004 |
Discovery of a huge magnetic field in the very young star NGC 2244-334 in the Rosette Nebula cluster
1
European Southern Observatory, Casilla 19001, Santiago 19, Chile e-mail: tszeifer@eso.org
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: jlandstr@astro.uwo.ca
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, sbagnulo@eso.org
Received:
5
September
2003
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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