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Symposium - International Astronomical Union, Late Stages of Stellar Evolution

Volume 66 - 1974
Contents

Page 4 of 5

Research Article

  • Nuclei of Planetary Nebulae

  • C. R. O'Dell
  • Published online by Cambridge University Press:
    14 August 2015, pp. 213-219
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  • The nuclei of planetary nebulae are examined both observationally and theoretically. It is seen that the region occupied by these stars in the logT – logL diagram is quite wide but consistent with a general progression of stars from high to low luminosity, with a noticeable but not large increase in luminosity during the early phase. The ‘evolutionary path’ is intrinsically quite wide and may indicate the evolution of stars under different conditions or non-monotonic passage along the mean path. Among the several theoretical approaches to this subject, only the double shell burning models seem to offer enough luminosity and short enough timescales to match the observations.

Discussion

  • Discussion after Paper by O'Dell

  • Published online by Cambridge University Press:
    14 August 2015, pp. 220-221
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Research Article

  • White Dwarfs

  • S. C. Vila
  • Published online by Cambridge University Press:
    14 August 2015, pp. 222-230
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  • The effects of core crystallization and of convection in the envelope on the cooling of white dwarfs are reviewed. The case of a 0.6 M⊙ white dwarf composed of an oxygen core and a helium envelope is taken as example. Also the amount of hydrogen that a white dwarf can accrete before nuclear burning occurs is estimated and possible evolutionary relations between white dwarfs of types DA, DB and DC, as advanced by Baglin and Vauclair, are presented.

Abstracts of Short Communications Presented after Paper by Vila

  • The Sources of Energy in White Dwarfs*

  • E. V. Chubarian, G. S. Sahakian, D. M. Sedrakian
  • Published online by Cambridge University Press:
    14 August 2015, p. 231
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  • Degenerate Dwarfs with Liquefying Cores

  • Umberto De Angelis
  • Published online by Cambridge University Press:
    14 August 2015, pp. 232-233
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  • Circulation in Differentially Rotating White Dwarfs*

  • C. Möllenhoff, R. Kippenhahn
  • Published online by Cambridge University Press:
    14 August 2015, p. 235
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Discussion

  • Discussion after Paper by Vila

  • Published online by Cambridge University Press:
    14 August 2015, p. 236
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Other

  • Horizontal Branch Stars

  • Published online by Cambridge University Press:
    14 August 2015, p. 237
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Abstracts of Short Communications Presented after Remarks by Iben

  • Four-Color Observations of Blue Horizontal-Branch Stars*

  • A. G. Davis Philip
  • Published online by Cambridge University Press:
    14 August 2015, pp. 238-239
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  • On the Behaviour of Globular Cluster Red Giants in the Color-Magnitude Diagram

  • R. M. Russev
  • Published online by Cambridge University Press:
    14 August 2015, pp. 240-243
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  • Photometric Behaviour of Field RR Lyrae Stars*

  • K. Stepien
  • Published online by Cambridge University Press:
    14 August 2015, p. 244
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Research Article

  • What SNU? The Case of the Missing Solar Neutrinos

  • William A. Fowler
  • Published online by Cambridge University Press:
    14 August 2015, pp. 245-248
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  • The current attempts to observe solar neutrinos are reviewed. It is concluded that serious consideration must be given to the possibility that the neutrino flux from the Sun is essentially zero even though we are not yet absolutely forced to this conclusion. Transient effects in the Sun are briefly discussed as a possible explanation for the lack of solar neutrinos.

Abstracts of Short Communications Presented after Paper by Fowler

  • Effect of Magnetic Field on Solar Neutrino Flux

  • K. J. Fricke
  • Published online by Cambridge University Press:
    14 August 2015, p. 250
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  • Praesepe: No Evidence for Solar Mixing

  • R. C. Smith
  • Published online by Cambridge University Press:
    14 August 2015, p. 251
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Other

Discussion

  • General Discussion

  • Published online by Cambridge University Press:
    14 August 2015, pp. 254-255
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Other

  • Concluding Remarks

  • M. Schwarzschild
  • Published online by Cambridge University Press:
    14 August 2015, pp. 256-258
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  • Subject Index

  • Published online by Cambridge University Press:
    14 August 2015, pp. 259-261
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Page 4 of 5