AN ABRUPT DECREASE IN THE ROTATIONAL PERIOD OF THE CHEMICALLY PECULIAR MAGNETIC STAR CU VIRGINIS

Authors
PYPER DM RYABCHIKOVA T MALANUSHENKO V KUSCHNIG R PLACHINDA S SAVANOV I
Citation
Dm. Pyper et al., AN ABRUPT DECREASE IN THE ROTATIONAL PERIOD OF THE CHEMICALLY PECULIAR MAGNETIC STAR CU VIRGINIS, Astronomy and astrophysics (Berlin), 339(3), 1998, pp. 822-830
Citations number
30
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics (Berlin) → ACNP
ISSN journal
00046361
Volume
339
Issue
3
Year of publication
1998
Pages
822 - 830
Database
ISI
SICI code
0004-6361(1998)339:3<822:AADITR>2.0.ZU;2-V
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 mod el for this star implies an abrupt change of the rotation rate. We fin d no spectroscopic evidence that the star is a close binary, ruling ou t a possibility that the period decrease is caused by the mass exchang e.