Additional UBVRI photometric searches for periodic light variability from T Tauri stars

Details Additional UBVRI photometric searches for periodic light variability from T Tauri stars Additional UBVRI photometric searches for periodic light variability from T Tauri stars

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..483v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, Feb. 1989, p. 483-498. Research supported by the Mericos Foundation, Margaret W.

Astronomy and Astrophysics

Astronomy

53

Pre-Main Sequence Stars, Stellar Spectrophotometry, T Tauri Stars, Ubv Spectra, Emission Spectra, H Alpha Line, Photosphere, Spectral Line Width, Stellar Color, Stellar Luminosity, Stellar Rotation

Scientific paper

UBVRI photometric monitoring of five T Tauri stars (DH Tau, DI Tau, GG Tau, AA Tau, and HP Tau) and one weak-emission pre-main-sequence star (HP Tau/G2) have been carried out in an effort to determine rotation periods via rotational modulation of surface hot and cool regions. Rotation periods of 7.2, 7.9, 8.2, and 1.2 days were found for DH Tau, DI Tau, AA Tau, and HP Tau/G2, respectively. Consistent with the results of previous studies, the spots on the strong-emission (T Tauri) stars appear to be hot relative to the stellar photospheres, while those on the weak-emission stars are cooler than the photospheres. The hot regions appear to be the cause of both periodic and aperiodic light variability in T Tauri stars on timescales of days and weeks. Spectrophotometry concurrent with the photometric monitoring was obtained on several nights for many of the stars. While no correlations between stellar brightness and H-alpha emission could be found for any individual star, H-alpha equivalent-width variability correlates well with photometric variability from star to star.

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