Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-26T03:52:08.707Z Has data issue: false hasContentIssue false
  • English
  • Français

The Bump Cepheid Mass Discrepancy Laid to Rest (?)

Published online by Cambridge University Press:  15 February 2018

P. Moskalik  and
J. R. Buchler
P. Moskalik
Affiliation:
Copernicus Astronomical Center, Warsaw, Poland
J. R. Buchler
Affiliation:
University of Florida, Gainesville, USA

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The beat and bump mass discrepancies have been a long standing, unsolved difficulty in the Cepheid modelling (Cox 1980). The new opacities of Rogers & Iglesias (1992) has provided a partial solution to the problem, bringing the beat masses into good agreement with other mass determinations (Moskalik, Buchler & Marom 1992; herafter MBM). The discrepancy for the bump masses has also been greatly reduced, nevertheless it has not been eliminated entirely.

Recently, the new version of the Livermore tables has been released (Iglesias, Rogers & Wilson 1992). The new calculations take into account previously disregarded spin-orbit coupling in the iron atoms. The inclusion of this effect leeds to a further enhancement of the “metal opacity bump” around 2-5xl05K. In the following we repeat the calculations of MBM to assess the consequences of this enhancement for the bump mass calibration.

Type
Theoretical Breakthroughs
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 237 - 239
Copyright
Copyright © Cambridge University Press 1993

References

Becker, S. A., Iben, I. & Tuggle, R. S. 1977, Astrophys. J., 218, 633 Google Scholar
Buchler, J. R., Moskalik, P. & Kovacs, G. 1990, Astrophys. J., 351, 617 Google Scholar
Caldwell, J. A. R. & Coulson, I. M. 1987, Astron. J., 93, 1090 Google Scholar
Cox, A. N. 1980, Ann. Rev. Astron. Astrophys., 18, 15 Google Scholar
Fernie, J. D. 1992, Astron. J., 103, 1647 Google Scholar
Gieren, W. P. 1988, Astrophys. J., 329, 790 Google Scholar
Gieren, W. P. 1989, Astron. Astrophys., 225, 381 Google Scholar
Iglesias, C. A., Rogers, F. J. & Wilson, B. G. 1992, Astrophys. J. (submitted)Google Scholar
Moskalik, P., Buchler, J. R. & Marom, A. 1992, Astrophys. J., 385, 685 (MBM)Google Scholar
Rogers, F. J. & Iglesias, C. A. 1992, Astrophys. J. Suppl., 79, 507 CrossRefGoogle Scholar
Simon, N. R. & Schmidt, E. G. 1976, Astrophys. J., 205, 162 Google Scholar
Walker, A. R. 1988, in The Extragalactic Distance Scale, eds. van den Bergh, S. & Prichet, C. J., ASP Conf. Ser 4, p. 89 Google Scholar