of the pulsational mechanisms in variable stars. First at Cornell University and later at the University of Colorado, from where he collaborated with workers at the Los Alamos National Laboratories, he made several outstanding contributions in his field. He produced the first exact, linear, non-adiabatic treatment of pulsation. Along with Zhevakin, Cox realized the importance of the second helium ionization zone as the source of the driving power for Cepheids. He also made significant contributions to our understanding of the Beta Cephei and RR Lyrae stars and authored several review papers and two books that are models of clarity in a very complex subject and will be cited for years to come. (M 19335)

Name proposed by H. R. Johnson and F. K. Ed-mondson.

Obituaries published in Phys. Today, Vol. 38, No. 1, p. 112 (1985); Q.J.R. Astron. Soc., Vol. 27, No. 2, p. 302-305 (1986).

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