H-R diagram with the primary (1) and the secondary (2) components of IO Aqr marked. Overplotted is the PARSEC isochrone that provides the best match to M, L, and Teff of the two stars, corresponding to an age of 1.88 Gyr. Dots on the isochrone correspond to the position of the best fit. The zero-age main-sequence (ZAMS) is also shown.
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