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Blue stragglers and other mass transfer/collision products are likely bornwith rapid rotation rates due to angular momentum transfer duringmass-transfer, merger or collisional formation. However, less is known aboutthe angular momentum evolution of these stars as they age. Here we comparerotation rates and post-formation ages of mass-transfer products to models ofangular momentum evolution for normal main-sequence stars and collisionallyformed blue stragglers. In our sample, we include both F- and G-type bluestragglers in the cluster NGC 188 and post-mass-transfer GK main-sequence starsin the field, all binaries with WD companions. We compare ages derived from WDcooling models to photometric rotation periods and/or spectral vsinimeasurements. We demonstrate that these systems have rapid rotation rates soonafter formation. They then spin down as they age much as standard solar-typemain-sequence stars do. We discuss the physical implications of this result,which suggests that the spin-down of post-mass transfer stars can be describedby standard magnetic-braking prescriptions. This opens up the possibility ofusing gyrochronology as a method to determine the time since formation of bluestraggler stars and other post-mass-transfer binaries.

Observations of Spin-Down in Post-Mast-Transfer Stars and the Possibility for Blue Straggler Gyrochronology