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The star HD 28363 in the Hyades cluster has been known for over a century asa visual binary with a period of 40 yr. The secondary is, in turn, asingle-lined spectroscopic binary with a 21-day period. Here we reportextensive spectroscopic monitoring of this hierarchical triple system thatreveals the spectral lines of the third star for the first time. Combined withastrometric information, this makes it possible to determine the dynamicalmasses of all three stars. Only six other binaries in the Hyades have had theirindividual component masses determined dynamically. We infer the properties ofthe system by combining our radial velocity measurements with visualobservations, lunar occultation measurements, and with proper motions from theHipparcos and Gaia missions that provide a constraint on the astrometricacceleration. We derive a mass of 1.341 +/- 0.026/0.024 M(Sun) for the visualprimary, and 1.210 +/- 0.021 M(Sun) and 0.781 +/- 0.014 M(Sun) for the othertwo stars. These measurements along with those for the other six systemsestablish an empirical mass-luminosity relation in the Hyades that is in broadagreement with current models of stellar evolution for the known age andchemical composition of the cluster.

Dynamical masses for the triple system HD 28363 in the Hyades cluster