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Issue A&A
Volume 375, Number 3, September 2001
Page(s) 977 - 981
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010883



A&A 375, 977-981 (2001)
DOI: 10.1051/0004-6361:20010883

Periodic variations in the colours of the classical T Tauri star RW Aur A

P. P. Petrov1, J. Pelt1, 2 and I. Tuominen1

1  Astronomy Division, PO Box 3000, 90014 University of Oulu, Finland
2  Tartu Observatory, 61602 Tõravere, Estonia

(Received 19 April 2001 / Accepted 18 June 2001 )

Abstract
The classical T Tauri star RW Aur A is an irregular variable with a large amplitude in all photometric bands. In an extended series of photometric data we found small-amplitude periodic variations in the blue colours of the star, with a period of $2\fd64$. The period was relatively stable over several years. The amplitude of the periodic signal is $0\fm21$ in U-V, $0\fm07$ in B-V, and about $0\fm02$ in V-R and V-I. No periodicity was found in the V magnitude. The relevance of this photometric period to the recently discovered periodicity in spectral features of the star is discussed, and the hypothesis of a hot spot is critically considered.


Key words: stars: individual: RW Aur -- stars: pre-main sequence -- stars: variables -- methods: statistical

Offprint request: P. P. Petrov, Peter.Petrov@Oulu.Fi

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