BD+37 410 & DS And light curve and radial velocity

For DSAnd, we find M1=1.692{+/-}0.004{+/-}0.010M{sun}, R1=2.185{+/-}0.004{+/-}0.008R{sun}, M2=1.184 {+/-}0.001{+/-}0.003M{sun}, and R2=1.200{+/-}0.003{+/-}0.005R{sun}. We either confirm or newly identify unusual characteristics of both stars in the binary: the primary star is found to be slightly hotter than the main-sequence turnoff and there is a more substantial discrepancy in its luminosity compared to models (model luminosities are too large by about 40%), while the secondary star is oversized and cooler compared to other main-sequence stars in the same cluster.

The evidence points to nonstandard evolution for both stars, but most plausible paths cannot explain the low luminosity of the primary star. BD+37410 only has one eclipse per cycle, but extensive spectroscopic observations and the Transiting Exoplanet Survey Satellite light curve constrain the stellar masses well: M1=1.717{+/-}0.011M{sun} and M2=1.175{+/-}0.005M{sun}. The radius of the main-sequence primary star near 2.9R{sun} definitively requires large convective core overshooting (>0.2 pressure scale heights) in models for its mass, and multiple lines of evidence point toward an age of 1.61{+/-}0.03{+/-}0.05Gyr (statistical and systematic uncertainties).