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Chushiro Hayashi ( was a Japanese ? , Hayashi Ch?shir?, July 25, 1920 – February 28, 2010) astrophysicist. Hayashi tracks on the Hertzsprung-Russell diagram are named after him.
Hayashi was born in
Kyoto and enrolled at the Imperial University of Tokyo in 1940, earning his BSc in Physics after 2½ years, in 1942. He was conscripted into the navy and, after the war ended, joined the group of  Hideki Yukawa at Kyoto University. He was appointed a professor at Kyoto University in 1957. 
He made additions to the
Big Bang nucleosynthesis model that built upon the work of the classic Alpher-Bethe-Gamow 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 and died from
pneumonia at a Kyoto hospital on February 28, 2010.  
Awards and Honours
^ a b c
Nakagawa, Y. (2011), "Obituary: Chushiro Hayashi (1920-2010)", Bulletin of the American Astronomical Society, 43: 014, Bibcode: 2011BAAS...43..014N, doi: 10.3847/BAASOBIT2011014
Hayashi, C. (1961). "Proton-neutron concentration ratio in the expanding Universe at the stages preceding the formation of the elements". . Progress of Theoretical Physics 5 (2): 224-235. doi: . 10.1143/PTP.5.224
Hayashi, C. (1961). "Stellar evolution in early phases of gravitational contraction". . Publications of the Astronomical Society of Japan 13: 450-452. Bibcode: 1961PASJ...13..450H.
Hayashi, C.; Nakano, T. (1963). "Evolution of Stars of Small Masses in the Pre-Main-Sequence Stages". . Progress of Theoretical Physics 30 (4): 460-474. Bibcode: 1963PThPh..30..460H. doi: . 10.1143/PTP.30.460
Sugimoto, D. (2010). "Chushiro Hayashi 1920-2010". . Astronomy & Geophysics 51 (3): 3.36. Bibcode: 2010A&G....51c..36S. doi: . 10.1111/j.1468-4004.2010.51336.x
"Award-winning Japanese astrophysicist Hayashi dies at 89". Kyodo News. March 1, 2010 . Retrieved 2010.
^ Japan Academy,
61st-70th; retrieved 2011-08-15