On the Origin of the Abundance Anomalies in IK Peg

  • B. Smalley
  • K. C. Smith
  • D. Wonnacott
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 208)


IK Peg is a binary system comprising a pulsating A-type star in orbit with a massive white dwarf. A detailed abundance analysis of IK Peg A has been performed. It is found that the Ca and Sc abundances are approximately solar, and the Fe-group elements slightly enhanced. IK Peg is not a classical Am star but the results are not inconsistent with its spectroscopic classification as a marginal Am star. An excess of Ba and Sr are found. These anomalies could be explained by radiative diffusion processes operating in the atmosphere of IK Peg A, even though it is undergoing small-amplitude pulsations. Alternatively, since the companion is a massive white dwarf, these anomalies could be the result of mass transfer during the common envelope phase of the binary system’s evolution.


White Dwarf Radiative Diffusion Cataclysmic Variable Common Envelope Abundance Analysis 
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  1. Cowley A., Cowley C, Jaschek H., Jaschek C, 1969, AJ, 74, 375ADSCrossRefGoogle Scholar
  2. Kurtz, D.W., 1978, Ap. J., 221, 869ADSCrossRefGoogle Scholar
  3. North P., Berthet S., Lanz T., 1995, A&A, 281, 775ADSGoogle Scholar
  4. Sarna M.J., Dhillon V.S., Marsh T.R., Marks P.B., 1995, MNRAS, 272, L41ADSGoogle Scholar
  5. Smalley B., Smith K.C., Wonnacott D., Allen C.S., 1996, MNRAS, 278, 688ADSGoogle Scholar
  6. Wonnacott D., Kellett B.J., Stickland D.J., 1993, MNRAS, 262, 277ADSGoogle Scholar
  7. Wonnacott D., Kellett B.J., Stickland D.J., 1993, MNRAS, 262, 277 Wonnacott D., Kellett B.J., SmaUey B., Lloyd C, 1994, MNRAS, 267, 1045ADSGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • B. Smalley
    • 1
  • K. C. Smith
    • 2
  • D. Wonnacott
    • 3
  1. 1.Dept of PhysicsKeele UniversityStaffordshireUK
  2. 2.Dept of Physics & AstronomyUCLLondonUK
  3. 3.MSSLHolmbury St. MaryDorking, SurreyEngland

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