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Theoretical mean colors for RR Lyrae variablesA hydrodynamically pulsating 0.6 solar mass model of a typical RR Lyrae variable was studied with a radiation transport-hydrodynamic computer program to predict theoretical T sub 3 and colors at many phases and to find the proper methods for getting mean colors and the consequent mean effective temperatures. The variable Eddington radiation approximation method was used with gray and with multifrequency absorption coefficients to represent the radiation flow in the outer optically thin layers. Comparison between observed and computed B-V colors indicate that these low Z population 2 models are reasonably accurate using King 1A composition opacities. The well known Oke, Giver, and Searle relation between B-V and T sub e reproduced. Mean colors were found by four different averaging methods. The method that gives a mean color and the mean T sub e closest to the nonpulsating model was the separate intensity means of B and V.
Document ID
19800016752
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Davis, C. G.
(Los Alamos Scientific Lab. NM, United States)
Cox, A. N.
(Los Alamos Scientific Lab. NM, United States)
Date Acquired
August 10, 2013
Publication Date
May 1, 1980
Publication Information
Publication: NASA. Goddard Space Flight Center Current Probl. in Stellar Pulsation Instabilities
Subject Category
Astrophysics
Accession Number
80N25245
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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