Is the sun really a rigid rotator

Attention is drawn to observations of surface rotational periods in subgiants which indicate that a deep-seated reservoir of angular momentum must exist in these stars. This interpretation is compatible with theoretical studies of the rotational history of the Sun an sun-like stars, but is in apparent conflict with observations of p-mode splittings in the Sun. In order to understand better the source of this apparent discrepancy, we explore the predicted rotational splittings of several test rotation curves and compare them to the solar data. Finally, we discuss the implications of our findings for solar structure