Volume 445, Number 3, January III 2006
|Page(s)||L47 - L50|
|Published online||03 January 2006|
Letter to the Editor
HD 178892 – a cool Ap star with extremely strong magnetic field
Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180 Wien, Austria e-mail: email@example.com
2 Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, 109017 Moscow, Russia
3 Department of Astronomy and Space Physics, Uppsala University Box 515, 751 20 Uppsala, Sweden
4 Special Astrophysical Observatory of RAS, Nizhnij Arkhyz 369167, Russia
5 European Southern Observatory, Casilla 19001, Santiago 19, Chile
6 Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, 1290 Sauverny, Switzerland
Accepted: 29 November 2005
We report a discovery of the Zeeman resolved spectral lines, corresponding to the extremely large magnetic field modulus = 17.5 kG, in the cool Ap star HD 178892. The mean longitudinal field of this star reaches 7.5 kG, and its rotational modulation implies the strength of the dipolar magnetic component 23 kG. We have revised rotation period of the star using the All Sky Automated Survey photometry and determined P = 8.2478 d. Rotation phases of the magnetic and photometric maxima of the star coincide with each other. We obtained Geneva photometric observation of HD 178892 and estimated Teff = K using photometry and the hydrogen Balmer lines. Preliminary abundance analysis reveals abundance pattern typical of rapidly oscillating Ap stars.
© ESO, 2006
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