We investigate how the frequencies of gravity modes depend on the detailedproperties of the chemical composition gradient that develops near the core ofmain-sequence stars and, therefore, on the transport processes that are able tomodify the \mu profile in the central regions. We show that in main-sequencemodels, similarly to the case of white dwarfs, the periods of high-ordergravity modes are accurately described by a uniform period spacing superposedto an oscillatory component. The periodicity and amplitude of such componentare related, respectively, to the location and sharpness of the \mu gradient.We briefly discuss and interpret, by means of this simple approximation, theeffect of turbulent mixing near the core on the periods of both high-order andlow-order g modes, as well as of modes of mixed pressure-gravity character.
展开▼
