Constantine P. Deliyannis

Constantine P. Deliyannis

Professor, Astronomy


  • Ph.D., Physics, Yale University, 1990
  • M. Phil., Physics, Yale University
  • M.S., Physics, Yale University
  • B.S., Physics, Illinois Institute of Technology, 1980

Research interests

stellar interiors and stellar evolution; metal-poor stars; open clusters and globular clusters; big bang lithium; light element probes of big bang nucleosynthesis, chemical evolution, and physical processes inside stars

About Constantine P. Deliyannis

Professor Deliyannis has been on the IU Astronomy faculty since 1997. He received a B.S. in physics from Illinois Institute of Technology in 1980, M. Phil. and M.S. degrees in physics in 1982, and a Ph.D. in physics in 1990 from Yale University. He was a Beatrice Watson Parrent Postdoctoral Fellow at the University of Hawaii and a Hubble Postdoctoral Fellow at Hawaii and Yale. He typically teaches A100 (The Solar System), A221-A222 (General Astronomy I-II), and A451 (Stellar Astrophysics).

Selected publications

A search for radius inflation among active M-dwarfs in Praesepe, Jackson, R. J., Jeffries, R. D., Deliyannis, C. P., Sun, Q., Douglas, S. T. 2019, MNRAS, 483, 1125.

Li in Open Clusters: Cool Dwarfs in the Young, Subsolar-metallicity Cluster M35 (NGC 2168), Anthony-Twarog, B. J., Deliyannis, C. P., Harmer, D., Lee-Brown, D. B., Steinhauer, A., Sun, Q., Twarog, B. A. 2018, AJ, 156, 37

The inflated radii of M dwarfs in the Pleiades, Jackson, R. J., Deliyannis, C. P., Jeffries, R. D. 2018, MNRAS, 476, 3245.

WIYN Open Cluster Study. LXXVI. Li Evolution Among Stars of Low/Intermediate Mass: The Metal-deficient Open Cluster NGC 2506, Anthony-Twarog, B. J., Lee-Brown, D. B., Deliyannis, C. P., Twarog, B. A. 2018, AJ, 155, 138.

WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-aged Clusters. I. Hyades and Praesepe, Cummings, J. D., Deliyannis, C. P., Maderak, R. M., Steinhauer, A. 2017, AJ, 153, 128.

WIYN Open Cluster Study. LXXII. A uvbyCaHβ CCD Analysis of the Metal-deficient Open Cluster NGC 2506, Anthony-Twarog, B. J., Deliyannis, C. P., Twarog, B. A. 2016, AJ, 152, 192.

Boron Abundances Across the "Li-Be Dip" in the Hyades Cluster, Boesgaard, A. M., Lum, M. G., Deliyannis, C. P., King, J. R., Pinsonneault, M. H., Somers, G. 2016, ApJ, 830, 49.

View a complete list from the Astrophysics Data System

Recent courses

  • A100: Solar System
  • A221: General Astronomy I
  • A222: General Astronomy II
  • A451: Stellar Astrophysics