DOPPLER IMAGING OF THE COOL SPOT DISTRIBUTION ON THE WEAK T TAURI STAR V410 TAURIDOPPLER IMAGING OF THE COOL SPOT DISTRIBUTION ON THE WEAK T TAURI STAR V410 TAURI

摘要

A Doppler image of the spot distribution of the "naked" T Tauri star V410 Tau in epoch 1994.0 is presented. This image was derived using six photospheric absorption lines, and it shows a spot distribution dominated by a high-latitude spot whose center is offset from the rotation pole of the star and several midlatitude spots. V410 Tau may have a spot morphology similar to that seen in two other young stars (V824 Ara and HDE 283572), but slightly different to that seen in RS CVn stars, which tend to have a polar spot centered on the rotation pole. Hα, which appears consistently as emission in this star, shows dramatic variations in its equivalent width (by a factor of 4) and in its shape. Maximum Hα emission as well as very strong He I D_3 emission is seen at the phase when the high-latitude spot transits the disk, which indicates that chromospheric activity such as plage and flares may be associated with this spot feature.