Other
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..894g&link_type=abstract
Astronomicheskij Zhurnal, vol. 72, p. 894
Other
9
T Tauri Stars, Starspots, Light Curve, Emission Spectra, Photosphere, Stellar Rotation, Line Spectra, Stellar Spectrophotometry, Periodic Variations, Solar Activity
Scientific paper
Results are presented of a search for periodicities in the light curves of T Tauri stars with weak emission lines (WTTS) in dark clouds in Taurus-Auriga using data obtained in Maidanak in 1990-1993. Rotational periods were determined for 12 WTTS and refined for another 9 WTTS. The periodic variations are interpreted as the result of rotational modulation of a spotted photosphere. Properties of the spots for the majority of WTTS are similar to those of RS CVn stars. A fundamental result of the analysis of rotational modulation is the stability of the zero epochs and rotational periods of WTTS in intervals from 2 to 12 years. In addition, there is a high detection rate of rotational periods amongst WTTS in the sample considered. The stability of the zero epochs and rotational periods over several years indicates that the active region in each WTTS remains on a definite meridian over this time scale. Variations in the maximum brightness level, the amplitude and the shape of the light curve decline for several WTTS provide evidence for the migration of spots in the limits of an active zone and for variations in their area. The inverse correlation between the rotational period and the X-ray flux of WTTS is confirmed. Similar dependences of the H-alpha and CaII K line fluxes on rotational period were discovered for WTTS and for late-spectral-type dwarfs. Thus, a solar activity mechanism does not contradict the observational characteristics of these active stars.
Grankin Konstantin N.
Ibragimov M. A.
Kondrat'ev V. B.
Mel'nikov Yu. S.
Shevchenko Sergey. V.
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