UBVRI monitoring of five late-type pre-main-sequence stars

Details UBVRI monitoring of five late-type pre-main-sequence stars UBVRI monitoring of five late-type pre-main-sequence stars

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1015r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, July 1984, p. 1015-1021.

Astronomy and Astrophysics

Astronomy

47

K Stars, Late Stars, Pre-Main Sequence Stars, Stellar Spectrophotometry, Emission Spectra, H Alpha Line, Stellar Rotation, T Tauri Stars, Ubv Spectra

Scientific paper

Two T Tauri stars (DF Tau and DK Tau) and three pre-main-sequence K stars with weak line emission (WK X-Ray 1, WK X-Ray 2, and FK X-Ray 3) were monitored with UBVRI photometry over a 14-night period during October 1982. Neither T Tauri star shows an obvious rotational modulation in the light curve, but DF Tau did experience a multi-day flare-like brightening similar to the events seen in this star by Zajtseva and Lyutyi (1976). The light variations of the three weak-emission stars are well described by sine curves with periods of 5.6, 2.8, and 7.0 days, respectively; these values presumably represent the axial rotation periods of these stars. The results provide further evidence for K-type pre-main-sequence stars which rotate at least as fast as T Tauri stars but lack strong line and continuum emission.

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