The discovery of a 21-kG magnetic field in the Ap star BD+0°4535

Details The discovery of a 21-kG magnetic field in the Ap star BD+0°4535 The discovery of a 21-kG magnetic field in the Ap star BD+0°4535

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.401l..44e&link_type=abstract

Monthly Notices of the Royal Astronomical Society: Letters, Volume 401, Issue 1, pp. L44-L47.

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3

Stars: Abundances, Stars: Chemically Peculiar, Stars: Individual: Bd+0°4535, Stars: Magnetic Fields, Stars: Variables: Other

Scientific paper

With high-resolution spectral observations using a 2.2-m telescope, we found that the Ap star BD+0°4535 has a very strong magnetic field. From Zeeman components of rare earth element spectral lines, we detected an average magnetic field modulus of about 21kG, although for lines of different chemical elements the estimated magnetic field ranges between 15 and 23kG. This is a consequence of non-uniform surface distribution of these elements. Considering its possible variation with rotation period, the upper limit of magnetic field is potentially larger than what we have detected. For rare earth elements, large overabundances and ionization disequilibria were found.
Based on observations collected at the European Southern Observatory, La Silla, Chile, as part of programmes 083.D-0034(A) and 081.D-2002.
E-mail: velkin@uclan.ac.uk

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