Fig. 13.
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Histogram of ages for the Mira stars in our sample. The ages are given in Gyr, and were computed based on the stars’ periods according to Eq. (13). The bimodal age distribution is a direct consequence of the bimodal distribution in periods (Fig. 7): the minimum close to 365 d corresponds to an age of 4.9 Gyr, according to Eq. (13).
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