All evolutionary tracks presented in this database have been reduced to the same number of points (normalized) to calculate isochrones and for ease of interpolation. We refer to Pietrinferni et al. (2004, 2006) and Hidalgo et al. (2018) for a detailed discussion on the approach adopted for selecting these Key Points.
The total number of lines in each individual evolutionary track/isochrone are:
- 300 (last key point number 5) for the very low-mass structures.
- 420 (last key point number 7) for low mass stars whose core H-burning lifetime is larger than the Hubble time (i.e. less massive than about 0.7 M☉) .
- 2100 (last key point 19) for all other stellar models.
- 900 for the low-mass HB evolutionary tracks.
- 2100 for all the isochrones files.
The table below lists the correspondence between evolutionary stage, key point and the line number of the normalized tracks
The following figure shows the position of the various key points along the evolutionary tracks for the various stellar mass regime (the inset in the same figure shows the locationof key point 9 and 10 along the RGB bump phase)
