Photometric Variability Properties of 21 T Tauri and Related Stars from AAVSO Visual Observations

Details Photometric Variability Properties of 21 T Tauri and Related Stars from AAVSO Visual Observations Photometric Variability Properties of 21 T Tauri and Related Stars from AAVSO Visual Observations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010javso..38..151p&link_type=abstract

The Journal of the American Association of Variable Star Observers, vol. 38, nr. 2, p. 151

Physics

Scientific paper

T Tauri variables are sun-like stars in various stages of their birth. We have analyzed long-term AAVSO visual observations of 21 T Tauri and related stars, using Fourier and self-correlation techniques. This follows our previous study of eleven such stars in JAAVSO 35, 290 (2006). Only a few of the variables showed periodic behavior, but self-correlation analysis makes it possible to construct a "variability profile" - amount of variability versus time scale - for all the stars, not just the periodic ones. For some of the periodic variables, we have studied the long-term behavior of the periods and amplitudes: T Cha and HT Lup appear to be rotating variables with stable periods less than 10 days; RU Lup, UX Ori, and TU Phe appear to show transient cycles of typically 50-500 days, probably arising in the accretion disc. R CrA has a stable 66-day period, which would be unusually long for a rotation period; its cause is not clear. We also discuss interesting but spurious low-amplitude one-year and one-month periodicities which occur in a few of the stars. Finally: we comment on the star AQ Dra, an RR Lyrae star, originally classified as a T Tauri star with a 5.5-day period.

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