Chushiro Hayashi

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Chūshirō Hayashi
Born (1920-07-25)July 25, 1920
Died February 28, 2010(2010-02-28) (aged 89)
Kyoto, Japan
Nationality Japan
Fields astrophysics
Institutions Kyoto University
Alma mater University of Tokyo
Influences Hideki Yukawa
Notable awards Eddington Medal in 1970
Kyoto Prize in 1995
Bruce Medal in 2004

Chushiro Hayashi (林 忠四郎 Hayashi Chūshirō?, July 25, 1920 – February 28, 2010) was a Japanese astrophysicist. Hayashi tracks on the Hertzsprung–Russell 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 Alpher–Bethe–Gamow paper.[1] Probably his most famous work was the astrophysical calculations that led to the Hayashi tracks of star formation,[2] 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.[3] 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.[4][5]


  1. ^ 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. 
  2. ^ 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. 
  3. ^ 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. 
  4. ^ 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. 
  5. ^ "Award-winning Japanese astrophysicist Hayashi dies at 89". Kyodo News. March 1, 2010. Retrieved March 1, 2010. 

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