The Hertzsprung-Russell (HR) diagram plots a star's temperature versus its absolute magnitude. Stars follow well-studied trends on the HR diagram and many aspects of a star can be summarized by studying the HR diagram. This article explores properties related to the estimation of ages of young stellar objects, helping astronomers better understand their formation and evolution.

http://www.raa-journal.org/raa/index.php/raa/article/view/944