Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...280..486l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 280, no. 2, p. 486-492
Astronomy and Astrophysics
Astrophysics
21
A Stars, Field Strength, Peculiar Stars, Spectrum Analysis, Stellar Magnetic Fields, Astronomical Photometry, Iron, Line Spectra, Velocity Measurement, Zeeman Effect
Scientific paper
Although Am stars have been assumed to be nonmagnetic stars, we found recently that the hot Am stars omicron Peg has a magnetic field of the order of 2 kG, with a complex structure. Therefore, we reconsidered the question of magnetism among upper main sequence chemically peculiar stars. We report here new observations of a pair of magnetically sensitive Fe II lines in the red spectrum of Am stars and of HgMn stars. Two other hot Am stars, HD 29173 and HD 195479A, are likely to possess also a magnetic field of about the same strength. It is striking that 3 out of 4 hot Am stars observed up to now could be magnetic. On the other hand, this fast method is limited by blends and cannot provide a satisfactory diagnosis for classical Am stars and for HgMn stars. A multi-line approach must be the next step towards our understanding of magnetism among these chemically peculiar stars.
Lanz Thierry
Mathys Gautier
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