Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..326v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Feb. 1985, p. 326-332.
Astronomy and Astrophysics
Astronomy
16
Stellar Color, T Tauri Stars, Visible Spectrum, Astronomical Photometry, Chromosphere, Flare Stars
Scientific paper
The dependence of U - B, B - V, and V - I color on V magnitude is examined for ten well-observed T Tauri stars, based on photometry from numerous sources. It is found that the 'color slopes' d(B - V)/dV and d(V - I)/dV, due to variability, differ significantly between stars and tend to be larger for T Tauri stars of later spectral type. Furthermore, when the color slopes are small, the B - V color slope is significantly less than the V - I color slope. All of these results are in accord with the hypothesis that the primary source of large-amplitude brightness variations in T Tauri stars is a changing mix of photospheric regions, hot plage regions, and dark spots on the stellar surface. In addition, the large scatter observed in U - B is consistent with flare-like events.
Rydgren Eric A.
Schmelz Joan T.
Vrba Fred J.
Zak D. S.
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