High precision photometry and spectroscopy of low-mass stars reveal a variety
of properties standard stellar evolution cannot predict. Rotation, an essential
ingredient of stellar evolution, is a step towards resolving the discrepancy
between model predictions and observations. The first rotating stellar model,
continuously tracing a low-mass star from the pre-main sequence onto the
horizontal branch, is presented. The predicted luminosity functions of stars of
globular clusters and surface rotation velocities on the horizontal branch are
discussed.Comment: 5 pages, 4 figures. Oral contrubution. Proceedings of the workshop
"XXI Century challenges for stellar evolution", held in Cefalu' (Sicily,
Italy), August 29 - September 2, 2007; S. Cassisi and M. Salaris Eds. To be
published in Mem. SAIt Vol. 79 No.