Advertisement

Activity in stars with shallow convection zones: The early F-type stars

  • Sidney C. Wolff
Stars with Thin and Thick Convective Zones
Part of the Lecture Notes in Physics book series (LNP, volume 291)

Abstract

Observations of transition region and coronal emission show that the onset of activity in main sequence stars occurs at about spectral type FO or Teff = 7200 K. A few hotter stars are active, but there is no observational evidence of non-radiative heating in most A-type stars. Nearly all F-type stars in the temperature range 6600 K < Teff < 7200 K are active, an unexpected result given their shallow convection zones. In these stars, the total non-radiative flux does not correlate with rotation, Rossby number, or age, and so the bulk of the non-radiative heating in these stars may not be a consequence of stellar dynamos. An alternative possibility is acoustic heating, but acoustic models at the current state of their development cannot account in detail for the observations.

Keywords

Spectral Type Convection Zone Main Sequence Star Rossby Number Cool Star 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Baliunas, S. L. et al. 1983, Ap. J., 275, 752.Google Scholar
  2. Blanco, C., Catalano, S., Marilli, E. 1980, in Proc. Second European IUE Conf., Tubingen, ESA SP-157, p.63.Google Scholar
  3. Boesgaard, A. M. 1987, Pub. A.S.P., in press.Google Scholar
  4. Boesgaard, A. M. and Tripicco, M. J. 1986, Ap. J. (Letters), 302, L49.Google Scholar
  5. Böhm-Vitense, E. and Canterna, R. 1974, Ap. J., 194, 629.Google Scholar
  6. Böhm-Vitense, E. and Dettmann, T. 1980, Ap. J., 236, 560.Google Scholar
  7. Bohn, H. U. 1984, Astr. Ap., 136, 338.Google Scholar
  8. Caillault, J.-P. and Helland, D. J. 1985, Ap. J., 289, 279.Google Scholar
  9. Crivellari, L. and Praderie, F. 1982, Astr. Ap., 107, 75.Google Scholar
  10. Dravins, D. 1981, Astr. Ap., 96, 64.Google Scholar
  11. Endal, A. S. and Sofia, S. 1981, Ap. J., 243, 625.Google Scholar
  12. Freire, R., Czarny, J., Felenbok, P. and Praderie, F. 1977. Astr. Ap., 61, 785.Google Scholar
  13. Freire, R.,Czarny, J., Felenbok, P. and Praderie, F. 1978, Astr. Ap., 68, 89.Google Scholar
  14. Freire Ferrero, R. 1986, Astr. Ap., 159, 209.Google Scholar
  15. Giampapa, M. S. and Rosner, R. 1984, Ap. J. (Letters), 286, L19.Google Scholar
  16. Gilliland, R. L. 1985, Ap. J., 299, 286.Google Scholar
  17. Gilman, P. A. 1980, in Stellar Turbulence, ed. D. F. Gray and J. L. Linsky, Berlin: Springer-Verlag, p.19.Google Scholar
  18. Golub, L., Harnden, F. R., Maxson, C. W., Rosner, R., Vaiana, G. S., Cash, W. and Snow, T. P. 1983, Ap. J., 271, 264.Google Scholar
  19. Herbig, G. H. 1985, Ap. J., 289, 269.Google Scholar
  20. Kraft, R. P. 1967, Ap. J., 150, 551.Google Scholar
  21. Landini, M. and Monsignori-Fossi, B. C. 1973, Astr. Ap., 25, 9. Landman, D. A. 1981, Ap. J., 244, 345.Google Scholar
  22. Landsman, W. B., Henry, R. C., Moos, H. W. and Linsky, J. L. 1984, in Local Interstellar Medium, NASA Conf. Publ., 2345, p.60.Google Scholar
  23. Landstreet, J. D. 1982, Ap. J. 258, 639.Google Scholar
  24. Linsky, J. L. 1985, Solar Physics, 100, 333.Google Scholar
  25. Mangeney, A. and Praderie, F. 1984, Astr. Ap., 130, 143.Google Scholar
  26. Michaud, G., 1986, Ap. J., 302, 650.Google Scholar
  27. Noyes, R. W., Hartmann, L. W., Baliunas, S. L., Duncan, D. K. and Vaughan, A. H. 1984, Ap. J., 279, 763.Google Scholar
  28. Radick, R. R. et. al. 1982, Pub. A.S.P., 94, 934.Google Scholar
  29. Radick, R. R. et. al. 1983a, Pub. A.S.P., 95, 300.Google Scholar
  30. Radick, R. R. et. al. 1983b, Pub. A.S.P., 95, 621.Google Scholar
  31. Robinson, R. D., Worden, S. P. and Harvey, J. W. 1980, Ap. J. (Letters), 236, L155.Google Scholar
  32. Schmitt, J. H. M. M., Golub, L., Harnden, F. R., Maxson, C. W., Rosner, R. and Vaiana, G. S. 1985, Ap. J. 290, 307.Google Scholar
  33. Simon, T. and Landsman, W. 1987, Fifth Cambridge Workshop on Cool Stars.Google Scholar
  34. Simon, T., Herbig, G. and Boesgaard, A. M. 1985, Ap. J., 293, 551.Google Scholar
  35. Stern, R. A., Zolcinski, M.-C., Antiochos, S. K., and Underwood, J. H. 1981, Ap. J., 249, 647.Google Scholar
  36. Vaiana, G. S. et al. 1981, Ap. J., 245, 163.Google Scholar
  37. VandenBerg, D. A. and Bridges, T. J. 1984, Ap. J., 278, 679.Google Scholar
  38. Varsik, J. 1987, Ph.D. Dissertation, U. of Hawaii.Google Scholar
  39. Vaughan, A. H. et al. 1981, Ap. J., 250 276.Google Scholar
  40. Walter, F. M. 1983, Ap. J., 274, 794.Google Scholar
  41. Walter, F. M. and Linsky, J. L. 1986, in “New Insights in Astrophysics: Eight Years of UV Astronomy with IUE,” ESA SP-263, p.103.Google Scholar
  42. Walter, F. M., Linsky, J. L., Simon, T., Golub, L. and Vaiana, G. S. 1984, Ap. J., 281, 815.Google Scholar
  43. Wilson, O. C. 1966, Ap. J., 144, 695.Google Scholar
  44. Wilson, O. C. 1978, Ap. J., 226, 379.Google Scholar
  45. Wolff, S. C. and Heasley, J. N. 1984, Pub. A.S.P., 96, 231.Google Scholar
  46. Wolff, S. C. and Heasley, J. N. 1987, Pub. A.S.P., in press.Google Scholar
  47. Wolff, S. C., Boesgaard, A. M. and Simon, T. 1986, Ap. J., 310, 360.Google Scholar
  48. Zarro, D. M. and Zirin, H. 1986, Ap. J., 304, 365.Google Scholar
  49. Zirin, H. 1975, Ap. J. (Letters), 199, L63.Google Scholar

Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Sidney C. Wolff
    • 1
  1. 1.National Optical Astronomy ObservatoriesTucson

Personalised recommendations