EDP Sciences
Free access
Volume 375, Number 3, September 2001
Page(s) 982 - 988
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010895

A&A 375, 982-988 (2001)
DOI: 10.1051/0004-6361:20010895

On the rotation of the chemically peculiar magnetic star 56 Arietis

Saul J. Adelman1, V. Malanushenko2, 3, T. A. Ryabchikova4, 5 and I. Savanov2, 3

1  Department of Physics, The Citadel, 171 Moultrie Street, Charleston, SC 29409, USA
2  Crimean Astrophysical Observatory, 334413 Nauchny, Crimea, Ukraine
    e-mail: victor@crao.crimea.ua; savanov@crao.crimea.ua
3  Isaac Newton Institute of Chile, Crimean Branch, Ukraine
4  Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, 109017 Moscow, Russia
    e-mail: ryabchik@inasan.rssi.ru
5  Institute of Astronomy, University of Vienna, Türkenschanzstr. 17, 1180 Vienna, Austria

(Received 25 April 2001 / Accepted 20 June 2001)

This study used extensive sets of phase resolved photometric and spectroscopic data obtained by the authors and supplemented by that from the literature to investigate the light and equivalent width variations of the mCP star 56 Ari. Its rotational period is found to be increasing at a rate of about 2 s per 100 years. In addition there is evidence for a second period whose length is about 5 years which is attributed to the precession of the axis of rotation.

Key words: stars: chemically peculiar -- stars: variables: general -- stars: rotation -- stars: individual: 56 Ari

Offprint request: Saul J. Adelman, adelmans@adelvx.citadel.edu

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