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The angular diameter of 119 Tauri has been measured in three colors by lunar occultation, and it is used to derive the effective temperature and linear radius of this M2.2 Iab/-/ type star. These values are compared with those calculated for two stars of similar spectral type alpha Orionis and alpha Scorpii. Consistent results are obtained for the three stars and with recent model-atmosphere effective temperatures if alpha Orionis is assumed to have a variable photospheric diameter and if an empirical correction for the possible effects of circumstellar clouds is applied to the three stars. New mean spectral types and near-infrared photometry are given.
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N. M. White (1980) studied this question.
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