The authors report results from a multispectral investigation of stellar counterparts of X-ray sources in the general region of the Taurus-Auriga star-formation complex. They discuss 28 new low-mass pre-main-sequence "naked T Tauri" stars, bringing the census of naked T Tauri stars to 44 in the Tau-Aur region. The authors discuss the optical spectra and the optical and near-IR colors. They show that these stars are basically normal stars with ages of 1 - 40×10⁶yr. There is no evidence for IR or UV excesses. Chromospheric and coronal surface fluxes are comparable to those of the most active main-sequence stars and the RS CVn systems. The authors show that the chromospheric fluxes do not increase for stellar ages <10⁸yr, confirming the postulated exponential decay of stellar activity.
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Walter et al. (1988) studied this question.