Icko Iben, Jr. (born June 27, 1931) is an American astronomer and a Distinguished Professor at the University of Illinois at Urbana-Champaign. He received his PhD from the University of Illinois in 1958 with thesis Higher order effects in beta decay, which was jointly supervised by John David Jackson and Joseph Weneser. Iben served on the MIT Physics Department faculty for some time before moving to Illinois, being promoted to Associate Professor in 1964. He is best known for his contributions to theoretical star models, stellar evolution theory, concerning the production of planetary nebulae, red giant heavy element convection, and modelling of asymptotic branch thermal pulses.
Iben was elected to the National Academy of Sciences in 1985. He was awarded the Henry Norris Russell Lectureship in 1989 and the Eddington Medal in 1990. He is the author of the two-volume work Stellar evolution physics (2012–2013).
- "Ph.D. and M.Sc. students supervised by John David Jackson" (PDF). www-theory.lbl.gov. 5 April 2004.
- "Seven receive faculty appointments, five in physics" (PDF). The Tech. 9 Dec 1964. p. 1.
- "National Academy of Sciences Member Directory".
- Iben Jr., Icko (2013). Stellar evolution physics: Volume I. Physical processes in stellar interiors. Cambridge University Press. ISBN 978-1-107-01656-9; hbkCS1 maint: postscript (link)
- Iben Jr., Icko (2013). Stellar evolution physics: Volume II. Advanced evolution of single stars. Cambridge University Press. ISBN 978-1-107-01657-6; hbkCS1 maint: postscript (link)
- Ishak, B. (2016). "Review of Stellar Evolution Physics: Volume 1. Physical Processes in Stellar Interiors by Icko Iben, Jr". Contemporary Physics. 57 (1): 90–92. doi:10.1080/00107514.2015.1005679.
- Ishak, B. (2015). "Review of Stellar Evolution Physics: Volume 2: Advanced Evolution of Single Stars by Icko Iben, Jr". Contemporary Physics. 56 (3): 379–380. doi:10.1080/00107514.2015.1036926.