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Astron. Astrophys. 339, 822-830 (1998)

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An abrupt decrease in the rotational period of the chemically peculiar magnetic star CU Virginis

D.M. Pyper 1, T. Ryabchikova 2, V. Malanushenko 3, R. Kuschnig 4, S. Plachinda 3 and I. Savanov 3

1 University of Nevada-Las Vegas, Physics Department, 4505 Maryland Parkway, Las Vegas, NV 89154-4002, USA (dpsmith@nevada.edu)
2 Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, 109017 Moscow, Russia (ryabchik@inasan.rssi.ru)
3 Crimean Astrophysical Observatory, 334413 Nauchny, Crimea, Ukraine (victor@crao.crimea.ua)
4 Institute of Astronomy, University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria (kuschnig@galileo.ast.univie.ac.at)

Received 10 September 1997 / Accepted 22 June 1998

Abstract

Spectroscopic and photometric observations of the chemically peculiar star CU Vir over 40 years show that the period of variations decreased by 0.005 % between 1983-1987. The assumption of the rigid rotator model for this star implies an abrupt change of the rotation rate. We find no spectroscopic evidence that the star is a close binary, ruling out a possibility that the period decrease is caused by the mass exchange.

Key words: stars: chemically peculiar – stars: variables: other – stars: rotation – stars: individual: CU Vir

Send offprint requests to: Rainer Kuschnig, (kuschnig@galileo.ast.univie.ac.at)

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© European Southern Observatory (ESO) 1998

Online publication: October 22, 1998
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