Theoretical light and velocity curves for Cepheid variables. [Nonlinear models]

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New Research Initiatives Program W-318 was successfully completed with the calculation of a series of nonlinear Cepheid models with the new DYN code. The dynamical zoning feature of the DYN code makes it unique in that it allows reliable light curves, as well as velocity curves, to be calculated. The models are used to extend to light curves Christy's conclusion, based on velocity curves, that the observations of Cepheids cannot be matched unless the mass is significantly reduced (assuming a homogeneous composition). An examination of results also leads to the conclusion that observed light curves are considerably more complex than ... continued below

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Pages: 16

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Adams, T.F.; Davis, C.G. & Keller, C.F. December 1, 1978.

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Description

New Research Initiatives Program W-318 was successfully completed with the calculation of a series of nonlinear Cepheid models with the new DYN code. The dynamical zoning feature of the DYN code makes it unique in that it allows reliable light curves, as well as velocity curves, to be calculated. The models are used to extend to light curves Christy's conclusion, based on velocity curves, that the observations of Cepheids cannot be matched unless the mass is significantly reduced (assuming a homogeneous composition). An examination of results also leads to the conclusion that observed light curves are considerably more complex than has previously been thought. The light and velocity curves we have calculated should be useful guides for interpreting the observations. 36 references.

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Pages: 16

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Dep. NTIS, PC A02/MF A01.

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  • Report No.: LA-7598-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/6364926 | External Link
  • Office of Scientific & Technical Information Report Number: 6364926
  • Archival Resource Key: ark:/67531/metadc1208671

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 1, 1978

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Feb. 25, 2019, 3:31 p.m.

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Adams, T.F.; Davis, C.G. & Keller, C.F. Theoretical light and velocity curves for Cepheid variables. [Nonlinear models], report, December 1, 1978; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1208671/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.