Evolution of rotation in main-sequence stars

  • Sallie L. Baliunas
2. Rotation and Activity in Main Sequence Stars
Part of the Lecture Notes in Physics book series (LNP, volume 193)


A review of the classical and modern measurements of axial rotation and their implications for the evolution of rotation of stars on the lower main sequence is given. From stars of main-sequence spectral type A through early K, the dependence of rotation on mass and age is investigated, from results for stars in open clusters and in the field. The high-mass, single, normal dwarf stars of spectral type A display a common mean projected rotational velocity dependent on their masses and re gardless of their ages. The angular momentum per unit mass in this range decreases slowly with decreasing mass.

At approximately mid-F spectral type, the rotation rate declines sharply then decreases again slowly with decreasing mass. The sudden decline in average rotation is probably precipitated by the effect of braking by magnetic torques in stellar winds. Along the lower main sequence, not only mass but also age determines rotation. Rotation slows with time at a given mass. Observational evidence is consistent with rotation slowing with the inverse square root of the main-sequence age of a star, <vsini> ∞ t−1/2

Among the youngest main-sequence stars, those in the Pleiades near spectral type K2, rapid rotation (up to 150 km s) is common. These stars have gained angular momentum during the radiative-track phase of their pre-main-sequence evolution, and should shed their apparently excessive angular momentum on a rapid timescale, a few x 107 years, shorter than that predicted by the t−1/2 relationship.


Angular Momentum Rotational Velocity Spectral Type Main Sequence Stellar Wind 
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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  1. Abt, H.A. 1965, Ap. J. Suppl., 11, 429.CrossRefGoogle Scholar
  2. Abt, H.A. 1970, in Stellar Rotation, ed. A. Slettebak (Dordrecht, Holland: D. Reidel), p. 193.Google Scholar
  3. Abt, H.A., Chaffee, F.H. and Suffolk, G. 1967, Astron. J., 72, 783.CrossRefGoogle Scholar
  4. Baliunas, S.L., Vaughan, A.H., Hartmann, L., Middelkoop, F., Mihalas, D., Noyes, R.W., Preston, G.W., Frazer, J. and Lanning, H. 1983, Ap. J., in press.Google Scholar
  5. Bernacca, P.O. and Perinotto, M. 1974, Astron. Ap., 33, 443.Google Scholar
  6. Brandt, J. 1966, Ap J., 144, 1221.CrossRefGoogle Scholar
  7. Duncan, D.K. 1981, Ap. J., 248, 651.CrossRefGoogle Scholar
  8. Duncan, D.K. 1984, these proceedings.Google Scholar
  9. Duncan, D.K., Baliunas, S.L., Noyes, R.W., and Vaughan, A.H. 1984, in preparation.Google Scholar
  10. Endal, A.S. and Sofia, S. 1981, Ap. J., 243, 625.CrossRefGoogle Scholar
  11. Fukuda, I. 1982, Pub. A.S.P., 94, 271.CrossRefGoogle Scholar
  12. Gray, D.F. 1980, in Stellar Turbulence, ed. D.F. Gray and J.L. Linsky (New York: Springer), p. 75.Google Scholar
  13. Herbig, G. and Spalding, J.0 1955, Ap. J., 121, 118.CrossRefGoogle Scholar
  14. Huang, S.-S. 1953, Ap. J., 118, 285.CrossRefGoogle Scholar
  15. Iben, I., Jr. 1965, Ap. J., 141, 993.CrossRefGoogle Scholar
  16. Kraft, R.P. 1967a, Ap. J., 150, 551.Google Scholar
  17. Kraft, R.P. 1967b, Ap. J., 148, 129.CrossRefGoogle Scholar
  18. Kraft, R.P. 1970, in Spectroscopic Astrophysics, ed. G. Herbig (Berkeley: Univ. Calif. Press), p. 385.Google Scholar
  19. Lockwood, G.W., Thompson, D.T., Radick, R.R., Osborn, W.H., Baggett, W.E., Duncan, D.K. and Hartmann, L.W. 1984, Pub. A.S.P., in press.Google Scholar
  20. Noyes, R.W., Hartmann, L.W., Baliunas, S.L., Duncan, D.K. and Vaughan, A.H. 1984, A. J., in press.Google Scholar
  21. Patenaude, M. 1978, Astr. Ap., 66, 225.Google Scholar
  22. Schatzman, E. 1962, Ann. Astr., 25, 18.Google Scholar
  23. Skumanich, A. 1972, Ap. J., 171, 565.CrossRefGoogle Scholar
  24. Skumanich, A. and Eddy, J.A. 1981, in Solar Phenomena in Stars and Stellar Systems, ed. R. Bonnet and A.K. Dupree (Dordrecht: Reidel) p. 39.Google Scholar
  25. Slettebak, A. 1955, Ap. J., 121, 653.CrossRefGoogle Scholar
  26. Soderblom, D.R. 1982a, Ap. J., 263, 239.CrossRefGoogle Scholar
  27. Soderblom, D.R. 1982b, Carnegie Institution of Washington Yearbook, 81, 662.Google Scholar
  28. Soderblom, D.R. 1983, Ap. J. Suppl, 53, 1.Google Scholar
  29. Soderblom, D.R. 1984, these proceedings.Google Scholar
  30. Stauffer, J.R. 1984, these proceedings.Google Scholar
  31. Stauffer, J.R., Hartmann, L., Soderblom, D.R. and Burnham, N. 1984, Ap. J., in press.Google Scholar
  32. Struve, O. 1930, A p. J., 72, 1.Google Scholar
  33. Tonry, J. and Davis, M. 1979, A. J., 84, 1511.Google Scholar
  34. Van den Berg, D.A., Hartwick, F.D.A., Dawson, P. and Alexander, D.R. 1983, Ap. J., 266, 747.CrossRefGoogle Scholar
  35. Vaughan, A.H., Baliunas, S.L., Middelkoop, F., Hartmann, L.W., Mihalas, D., Noyes, R.W. and Preston, G.W. 1981, Ap. J., 250, 276.CrossRefGoogle Scholar
  36. Weber, E.J. and Davis, L., Jr. 1967, Ap. J.; 148, 217.Google Scholar
  37. Wilson, O.C. 1963, Ap. J., 138, 932.Google Scholar
  38. Wilson, O.C. 1966, Ap. J., 144, 795.Google Scholar
  39. Wilson, O.C. 1978, Ap. J., 226, 379.CrossRefGoogle Scholar
  40. Wilson, O.C., and Skumanich, A. 1964, Ap. J., 140, 1401.Google Scholar

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Sallie L. Baliunas
    • 1
  1. 1.Harvard-Smithsonian Center for AstrophysicsCambridge

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