S19A0042abst
S19A0042
We propose observations to determine the ages of pre-main sequence (PMS) binary stars in the Taurus star-forming region, to verify the stellar evolutionary models. Evolutionary models are essential for the understanding of star and planet formation. However, different evolutionary models yield different stellar masses and ages, and therefore the assessment of these models is necessary for advanced discussion of star and planet formation. Binary stars are useful for this assessment due to their coevality. We will determine the ages of eight PMS binary systems in the Taurus molecular cloud by using the spectroscopic method. Ages of these targets will be estimated from surface gravities determined with the equivalent width ratio of nearby absorption lines. This method is able to estimate the surface gravity and the age without the contamination arising from the uncertainties in distance, extinction, and veiling. Although this proposal was accepted on 17B semester and the observation was conducted on Jan 2018, only a half of the selected PMS stars were observed because of instrument trouble and poor weather. By combining the result of 17B and 19A semester, we will calibrate the stellar evolutionary models with more accurate ages compared to the general photometric method.
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