Celebration of the contributions of Art Cox to stellar pulsation interpretations Page: 3 of 14
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A Celebration of the Contributions of Art Cox to Stellar
John I. Castor
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Abstract. A roughly chronological account is given of Arthur N. Cox's
published work of 1953-1996 in, mostly, stellar pulsation theory, with a
digression into stellar opacity. When possible, his work is placed in the
context of the contemporary efforts.
Fifty years ago, in 1947, Svein Rosseland (1964) wrote his seminal book Pulsation
Theory of Variable Stars, which collected all the important early work on stellar
pulsation theory. In that same year Art Cox first came to Los Alamos National
Laboratory from Caltech, where he was an undergraduate, to work as a summer
student. Both pulsation theory and Art have advanced considerably since then.
Art's imprint on stellar pulsations has been quite sizable, and this short article
will attempt to summarize it.
Art's biography appears elsewhere in this volume, but it may be noted
here that after graduating from Caltech in 1948, Art entered the University of
Indiana, where he became one of the first of the Astronomy Ph. D. recipients
in 1954. Art immediately joined Los Alamos National Laboratory, where he
applied his skills to experimental diagnostics of above-ground nuclear tests. In
this work he shortly became the leader of the J-15 group. With the cessation
of atmospheric testing in the 1960s, Art and J-15 began giving some of their
attention to stellar evolution and pulsation, aided and abetted by a long list of
colleagues from the University of Indiana: Robert Brownlee, John Cox, Paul
Mutschlecner, David King and several others. John Cox in particular, who had
done his Ph. D. thesis on the role of the He II ionization zone in driving cepheid
pulsation, may have stimulated the work on cepheids. After a stint in the 1970s
as a Program Director at the NSF, Art returned to the Theoretical Division
of LANL, and entered a period of working prolifically on linear and non-linear
pulsations of almost every kind of variable star known, as he continues to do
2. Indiana Years-Stellar Photometry
His thesis was on the subject of stellar photometry, and his first published paper
(Cox 1953), in the Astrophysical Journal, was on the subject of transferring the
photometric standards from the northern to the southern hemisphere. For his
thesis he studied the color-magnitude diagram of the southern galactic cluster
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Castor, J. I. Celebration of the contributions of Art Cox to stellar pulsation interpretations, article, October 2, 1997; California. (https://digital.library.unt.edu/ark:/67531/metadc693843/m1/3/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.