The coronal dividing line

  • Bernhard M. Haisch
Re-examining the Corona/Wind Dividing Line
Part of the Lecture Notes in Physics book series (LNP, volume 291)


The observational status of the Dividing Line is reviewed up through EXOSAT and including the final EINSTEIN revisions. X-ray data are now available for approximately 400 late-type stars, and IUE ultraviolet spectra have been examined for over 300 late-type stars. A table of 15 hybrids is presented. When binaries are excluded, the only X-ray stars to the right of the line are α TrA (K4III) and HR 4521 (K3III), and a TrA may be a binary (Ayres 1985). The luminosity class-MV correspondence in the HR diagram is discussed. Other possible dividing lines now include the Rotational Braking Line and a λ10830 division. It is proposed that the Dividing Line is associated with the upturn into the giant branch. It is also suggested that low levels of transition region emission near the dividing line may be unrelated to coronae, reflecting instead a basal level.


Spectral Type Hybrid Star Rotational Brake Bright Star Catalogue Blue Loop 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Antiochos, S.K., Haisch, B.M. and Stern, R.A. 1986, Ap. J. Lett., 307, L55.Google Scholar
  2. Ayres, T.R. 1985, Ap. J. Lett., 291, L7.Google Scholar
  3. Ayres, T.R., Moos, H.W. and Linsky, J.L. 1981, Ap. J. Lett., 248, L137.Google Scholar
  4. Ayres, T.R. et al. 1981, Ap.J., 250, 293.Google Scholar
  5. Baliunas, S.L., Hartmann, L. and Dupree, A.K. 1983, Ap. J., 271, 672.Google Scholar
  6. Basri, G.S., Linsky, J.L. and Eriksson, K. 1981, Ap. J., 251, 162.Google Scholar
  7. Bennett, J.O. 1987, Ph.D. Thesis, Univ. of Colorado.Google Scholar
  8. Böhm-Vitense, E. 1986 Ap. J., 301, 297.Google Scholar
  9. Brown, A. 1986a, in 4th Camb. Workshop on Cool Stars, Stel. Sys. and the Sun, p. 454.Google Scholar
  10. Brown, A. 1986b, Advances in Space Res., in press.Google Scholar
  11. Brown, A. and Jordan, C. 1980, M.N.R.A.S., 191, 37P.Google Scholar
  12. Carpenter, K.G., Wing, R.F. and Stencel, R.E. 1985, Ap. J. Suppl., 57, 405.Google Scholar
  13. Corbally, C.J. and Garrison, R.F. 1984, in The MK Proc. and Stel. Classif., p. 277.Google Scholar
  14. Davidson, G.T., Claflin, E.S. and Haisch, B.M. 1987, A.J., in press.Google Scholar
  15. Drake, S.A., Brown, A. and Linsky, J.L. 1984, Ap. J., 284, 774.Google Scholar
  16. Feldman, U. 1983, Ap. J., 275, 367.Google Scholar
  17. Fleming, T.A. 1987, Ph. D. Thesis, University of Arizona.Google Scholar
  18. Frisk, U.O. and Bell, R.A. 1985, in Calibration of Fundamental Stellar Quantities, p. 543.Google Scholar
  19. Garrison, R.F. 1984, The MK Process and Stellar Classification, (Toronto: David Dunlop Obs.).Google Scholar
  20. Gondoin, P., Mangenay, A. and Praderie, F. 1987, Astr. Ap, 174, 187.Google Scholar
  21. Gray, D.F. 1982, Ap. J., 262, 682.Google Scholar
  22. Gray, D.F. and Nagar, P. 1985, Ap. J., 298, 765.Google Scholar
  23. Gray, D.F. and Toner 1986, Ap. J., 310, 277.Google Scholar
  24. Haisch, B.M. 1986a, Irish A. J., 17, 200.Google Scholar
  25. Haisch, B.M. 1986b, Advances in Sp. Res. 6, No. 8, 179.Google Scholar
  26. Haisch, B.M. and Simon, T. 1982, Ap. J., 263, 252.Google Scholar
  27. Haisch, B.M., Linsky, J.L and Basri, G.S. 1980, Ap. J., 235, 519.Google Scholar
  28. Haisch, B.M., Johnson, H.M. and Davidson, G.T. 1983, J. Astr. Scz., XXXI, 473.Google Scholar
  29. Hammer, R. 1987, Coronal and Noncoronal Stars, preprint.Google Scholar
  30. Hartmann, L., Dupree, A.K. and Raymond, J.C. 1980, Ap. J. Lett., 236, L143.Google Scholar
  31. Hartmann, L., Dupree, A.K. and Raymond, J.C. 1981, Ap. J., 246, 193.Google Scholar
  32. Hartmann, L., Dupree, A.K. and Raymond, J.C. 1982; Ap. J., 254, 214.Google Scholar
  33. Hauck, B. 1985, in Calibration of Fundamental Stellar Quantities, p. 271.Google Scholar
  34. Iben, I. 1964, Ap. J., 140, 1631.Google Scholar
  35. Keenan, P.C. 1982, P.A.S.P., 94, 299.Google Scholar
  36. Keenan, P.C. 1985, in Calibration of Fundamental Stellar Quantities, p. 121.Google Scholar
  37. Kovacs, N. 1983, Astr. Ap., 120, 21.Google Scholar
  38. Linsky, J.L. and Haisch, B.M. 1979, Ap. J., 229, L27.Google Scholar
  39. Maggio, A. et al. 1987, Ap. J., 315, 687.Google Scholar
  40. O'Brien, G.T. and Lambert, D.L. 1986, Ap. J. Supp., 62, 899.Google Scholar
  41. Oranje, B.J. 1986, Astr. Ap., 154, 185.Google Scholar
  42. Reimers, D. 1987, Winds in Late-Type Stars and the Solar Wind, preprint.Google Scholar
  43. Reimers, D. 1982, Astr. Ap., 107, 292.Google Scholar
  44. Reimers, D. 1977, Astr. Ap., 57, 395.Google Scholar
  45. Schrijver, C.J. 1987, Astr. Ap., 172, 111.Google Scholar
  46. Simon, T. 1984, Ap. J., 279, 738.Google Scholar
  47. Simon, T., Linsky, J.L. and Stencel, R.E. 1982, Ap. J., 257, 225.Google Scholar
  48. Smith, M.A. 1983, A. J., 88, 1031.Google Scholar
  49. Stencel, R.E. 1978, Ap. J. Lett., 223, L37.Google Scholar
  50. Stencel, R.E. and Mullan, D.J. 1980, Ap. J., 238, 221.Google Scholar
  51. Sweigart, A.V. and Gross, P.G. 1978, Ap. J. Supp., 36, 405.Google Scholar
  52. Vandenberg, D. A. 1985, Ap. J. Supp., 58, 711.Google Scholar
  53. Wing, R.F. 1985, in Calibration of Fundamental Stellar Quantities, p. 571.Google Scholar
  54. Zarro, D.M. and Zirin, H. 1986, Ap. J., 304, 365.Google Scholar
  55. Zirin, H. 1975, Ap. J. Lett., 199, L63. Zirin, H. 1982, Ap. J., 260, 655.Google Scholar

Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Bernhard M. Haisch
    • 1
  1. 1.Lockheed Palo Alto Research LaboratoryUSA

Personalised recommendations