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The mass and helium discrepancy in massive young stars

  • A. Herrero
  • R. P. Kudritzki
  • J. M. Vilchez
  • D. Kunze
  • K. Butler
  • S. Haser
I. “Norman” Early-Type Stars
Part of the Lecture Notes in Physics book series (LNP, volume 401)

Abstract

We present the results of the spectroscopic analysis of 25 galactic luminous OB stars. Using these data, spectroscopic and wind masses are derived. Both masses agree within the errors and disagree with evolutionary masses. Helium abundances are higher than normal for many objects, which cannot be explained by evolutionary calculations. We believe that the differences are significant, and call them the helium discrepancy and the mass discrepancy respectively. We indicate some possibilities of improving the physics in both theories in order to reduce the discrepancies.

Keywords

Evolutionary Calculation Mass Loss Rate Mass Discrepancy Stellar Atmosphere Fast Rotator 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Groenewegen, M.A.T., Lamers, H.J.G.L.M., Pauldrach, A.W.A.: A&A 221 78 (1989)Google Scholar
  2. Herrero, A., Vilchez, J.M., Kudritzki, R.P., Butler, K., Kunze, D. in “Stellar Atmospheres: Beyond Classical Models”, ed. L. Crivellari, I. Hubeny and D.G. Hummer, NATO ASI Series C, Vol. 341, pg. 409 (Kluwer Ac. Pub.) (1991)Google Scholar
  3. Kudritzki, R.P., Cabanne, M.L., Husfeld, D., Niemela, V., Groth, H.G., Puls, J., Herrero, A.: A&A 226 235 (1989a)Google Scholar
  4. Kudritzki, R.P., Pauldrach, A., Puls, J., Abbott, D.C.: A&A 219 205 (1989b)Google Scholar
  5. Kudritzki, R.P., Simon, K.P., Hamman, W.R.: A&A 118 245 (1983)Google Scholar
  6. Lennon, D.J., Kudritzki, R.P., Becker, S.R., Butler, K., Eber, F., Groth, H.G., Kunze, D.: A&A, in press (1991)Google Scholar
  7. Maeder, A.: A&A 178 159 (1987)Google Scholar
  8. Maeder, A.: A&AS 84 139 (1990)Google Scholar
  9. Voels, S.A., Bohannan, B., Abbott, D.C., Hummer, D.G.: ApJ 340 1073 (1989)Google Scholar
  10. Walborn, N.R.: ApJ 205 419 (1976)Google Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • A. Herrero
    • 1
  • R. P. Kudritzki
    • 2
    • 3
  • J. M. Vilchez
    • 1
  • D. Kunze
    • 2
  • K. Butler
    • 2
  • S. Haser
    • 2
    • 3
  1. 1.Instituto de Astrofísica de CanariasLa Laguna, TenerifeSpain
  2. 2.Universität-Sternwarte MünchenMünchen 80Germany
  3. 3.Max-Planck Institut für AstrophysikGarching bei München

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