Periodic variations in the colours of the classical T Tauri star RW Aur A
نویسندگان
چکیده
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. 64. The period was relatively stable over several years. The amplitude of the periodic signal is 0. 21 in U–V, 0. 07 in B–V, and about 0. 02 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.
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