Abstract
High-resolution spectra of the Herbig Ae/Be eclipsing binary TY CrA are obtained and used to measure high-precision radial velocities. We find TY CrA to be a single-lined spectroscopic binary having a circular orbit with a period of 2.88873 days, supporting a previous photometric period of 2.888777 days. We also place an upper limit of 15 km/s on the v sin i of the primary. Such a low rotational velocity corresponds to highly subsynchronous rotation, presuming the stellar rotation axis to have an inclination angle near 90. We argue that this remarkably slow rotation velocity in a circular orbit cannot be explained in the context of stellar evolution and tidal interactions alone. Presuming TY CrA to be a pre-main-sequence star, the origin of its subsynchronism must lie in a braking mechanism early in the life of the primary. Finally, we note that the lack of NIR excess emission indicates that no optically thick disk material is present within a few orbital separations of the binary.
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