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evolutionary track

(H-R diagram track of the life of a star)

The term evolutionary track is used for the track over a H-R diagram plotting a star's changes over its lifetime. The term stellar evolution indicates these changes (for a single star or a type of star) rather than like the more "biological" sense of evolution as how successive generations differ. An evolutionary track can be plotted as a curved line from a point plotted for the star at some point in its life (presumably early in its life, such as when it enters its main-sequence phase), leading to a later point in its life (e.g., its core collapse supernova). It might at some point enter the H-R diagram's red-giant region and possibly its asymptotic giant branch region.

Hayashi tracks are a set of such tracks calculated for the pre-main-sequence star phase.


(stars,stellar evolution,H-R diagram)
https://en.wikipedia.org/wiki/Main_sequence#Evolutionary_tracks
https://www.e-education.psu.edu/astro801/content/l5_p5.html

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