  was a japanese astrophysicist. hayashi tracks on the hertzsprungârussell diagram are named after him. he earned his b.sc in physics at the imperial university of tokyo in 1942. he then worked as a research associate under hideki yukawa at kyoto university. he made additions to the big bang nucleosynthesis model that built upon the work of the classic alpherâbetheâgamow paper.  probably his most famous work was the astrophysical calculations that led to the hayashi tracks of star formation,  and the hayashi limit that puts a limit on star radius. he was also involved in the early study of brown dwarfs, some of the smallest stars formed.  he retired in 1984. he won the eddington medal in 1970, the kyoto prize in 1995, and the bruce medal in 2004. chushiro hayashi died from pneumonia at a kyoto hospital on february 28, 2010.  {{cite web |date=march 1, 2010 |title=award-winning japanese astrophysicist hayashi dies at 89 |url=http://www.japantoday.com/category/national/view/award-winning-japanese-astrophysicist-hayashi-dies-at-89 |publishe
1920_births 2010_deaths Deaths_from_pneumonia Infectious_disease_deaths_in_Japan Japanese_astronomers Kyoto_University_alumni Kyoto_University_faculty Laureates_of_the_Imperial_Prize Members_of_the_United_States_National_Academy_of_Sciences Recipients_of_the_Order_of_Culture University_of_Tokyo_alumni