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Long-period classical Cepheids - Theory versus observationNew full amplitude models of classical Cepheids having periods longer than 13 days have been calculated, allowing the complete systematics of the observed light and velocity curves of classical Cepheids to be discussed in detail. Assuming that a normal evolutionary mass-luminosity relation is obeyed, the models reproduce such empirical phenomena as the full Hertzsprung progression of light and velocity curves and the gradual shift in phase of the Hertzsprung bump, together with the persistence in phase of the postmaximum shoulder on the light curve. Also reproduced are the retardation of maximum expansion velocity after maximum light, the correlation of light and velocity amplitudes, and the period-amplitude scatter diagram for both the light and the velocity amplitude. The average period predicted for a Cepheid light curve type is noted to be about 40 percent longer than that actually observed.
Document ID
19840039137
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Carson, T. R.
(NASA Goddard Inst. for Space Studies New York, NY, United States)
Stothers, R. B.
(NASA Goddard Institute for Space Studies New York, NY, United States)
Date Acquired
August 12, 2013
Publication Date
January 15, 1984
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 276
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
84A21924
Distribution Limits
Public
Copyright
Other

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