Skip to main content Accessibility help
×
Home

Observational Constraints on Dynamos in Cool Stars

  • C.J. Schrijver (a1)

Abstract

Non-radiatively heated outer atmospheres are common among stars on the cool side of the HR diagram. These atmospheres resemble that of the Sun in which the bulk of the heating is associated with magnetic fields. Consequently it is assumed that other cool stars also generate and maintain an internal magnetic field through a dynamo action. This field gives rise to a wide spectrum of phenomena in the stellar atmosphere. The dynamo process that sustains the field thrives on the interaction of rotation and turbulent convection. In this review I formulate a set of propositions outlining our present knowledge of this interaction as distilled from stellar observations. In doing so, I outline the effects of stellar evolution on rotation rate, discuss some of the proposed “dividing lines” in the HR-diagram, and comment on the possible role of the convective turnover time in dynamo efficiency and on dynamo activity for extremely slowly and rapidly rotating stars.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Observational Constraints on Dynamos in Cool Stars
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Observational Constraints on Dynamos in Cool Stars
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Observational Constraints on Dynamos in Cool Stars
      Available formats
      ×

Copyright

References

Hide All
Antioches, S.K., 1987, In Cool Stars, Stellar Systems, and the Sun, Linsky, J.L. and Stencel, R.E. (ede.), Springer-Verlag, p. 283.
Baliunas, S.L., 1986, In Cool Stars, Stellar Systems, and the Sun, Zeilik, M. and Gibson, D.M. (eds.), Springer-Verlag, p. 3.
Baliunas, S.L., Vaughan, A.H., 1985, Ann. Rev. Astron. Astrophys. 23, 379.
Basri, G., 1986, In Cool Stars, Stellar Systems, and the Sun, Zeilik, M. and Gibson, D.M. (eds.), Springer-Verlag, p. 184.
Basri, G., 1987a, in Cool Stars, Stellar Systems, and the Sun, Linsky, J.L. and Stencel, R.E. (eds.), Springer-Verlag, p. 411.
Basri, G., 1987b, Ap. J. 316, 377.
Böhm-Vitense, E., 1992, Astron. J. 1658, 608.
Durney, B.R., Latour, J., 1978, Geophys. Ap. Fluid Dyn. 9, 241.
Giampapa, M.S., Liebert, J., 1986, Ap. J. 305, 784.
Gilliland, R.L., 1985a, Ap. J. 300, 339.
Gilliland, R.L., 1985b, Ap. J. 299, 286.
Gray, D.F., 1989a, Ap. J. 347, 1021.
Gray, D.F., 1989b, in FGK Stars and T Tauri Stars, Cram, L.E. and Kuhi, L.V. (eds.), NASA SP-502, p.7.
Gray, D.F., 1991, In Angular Momentum Evolution of Young Stars, Catalano, S. and Stauffer, J.R. (eds.), Kluwer, The Netherlands, p. 183.
Gray, D.F., Nagel, T., 1989, Ap. J. 341, 421.
Haisch, B.M., et al., 1990, Ap. J. 861, 570.
Haisch, B., Schmitt, J.H.M.M., Rosso, C., 1991, Ap. J. 383, L15.
Hartmaan, L., Baliunas, S.L., Duncan, D.K., Noyes, R.W., 1984, Ap. J. 279, 778.
Judge, P.G., Stencel, R.E., 1991, Ap. J. 371, 357.
Lemmens, A.F.P., Rutten, R.G.M., Zwaan, C., 1992, A. & A., in press.
Kawaler, S.D., 1987, PASP 99, 1322.
Linsky, J.L., 1992, in proceedings of symposium From EINSTEIN to AXAF.
Linsky, J.L., Haisch, B.M., 1979, Ap. J. 229, L27.
Maceroni, C., et al., 1990, A. & A. 237, 395.
MacGregor, K.B., Brenner, M., 1991, Ap. J. 376, 204.
Maeder, A., Meynet, G., 1988, A. & A. Suppl. 76, 411.
Maeder, A., Meynet, G., 1989, A. & A. 210, 155.
Middelkoop, F., Zwaan, C., 1981, A. & A. 101, 26.
Noyes, R.W., 1983, In Solar and Stellar Magnetic Fields: Origins and Coronal Effects, Stenflo, J.O. (ed.), Reidel, Dordrecht, p. 133.
Noyes, R.W., et al., 1984a, Ap. J. 279, 763.
Noyes, R.W., Weiss, N.O., Vaughan, A.H., 1984b, Ap. J. 287, 764.
Parker, E.N., 1979, Cosmical Magnetic Fields; Their Origins and Their Activity, Clarendon Press, Oxford.
Pasquini, L., Bracato, E., Pallavicini, R., 1990, A. & A. 234, 277.
Rutten, R.G.M., 1987, A. & A. 177, 131.
Rutten, R.G.M., Schrijver, C.J., 1987, A. & A. 177, 155.
Rutten, R.G.M., Pylyser, E., 1988, A. & A. 191, 227.
Rutten, R.G.M., Schrijver, C.J., Lemmens, A.F.P., Zwaan, C., 1991, A. & A. 252, 203.
Rutten, R.G.M., et al., 1989, A. & A. 219, 234.
Saar, S.H., 1990, In The Sun and Cool Stars: activity, magnetism, dynamos, Tuominen, I., Moss, D., and Rüdiger, G. (eds.), Springer-Verlag, p 389.
Schrijver, C.J., 1987, A. & A. 172, 111.
Schrijver, C.J., 1991, In Mechanisms of Chromospheric and Coronal Heating, Ulmschneider, P., Priest, E.R. Rosner, R. (eds.), Springer-Verlag, p. 257.
Schrijver, C.J., Dobson, A.K., Radick, R.R., 1989, Ap. J. 341, 1035.
Schrijver, C.J., Zwaan, C., 1991, A. & A. 251, 183.
Skumanich, A., 1972, Ap. J. 171, 565.
Simon, T., Fekel, F.C. Jr., 1987, Ap. J. 316, 434.
Simon, T., Drake, S.A., 1989, Ap. J. 346, 303.
Simon, T., Landsman, W:, 1991, Ap. J. 380, 200.
Soderblom, D.R., Duncan, D.K., Johnson, D.R.H., 1991, Ap. J. 375, 722.
Ulmschneider, P., Priest, E.R., Rosner, R. (eds.), 1991, Mechanisms of Chromospheric and Coronal Heating, Springer-Verlag.
Verbunt, F., Zwaan, C., 1981, A. & A. 100, L7.
Vilhu, O., 1987, In Cool Stars, Stellar Systems, and the Sun, Linsky, J.L. and Stencel, R.E. (eds.), Springer-Verlag Berlin, p 110.
Vilhu, O., et al., 1989, A. & A. 222, 179.
Walter, F.M., 1987, In Cool Stars, Stellar Systems, and the Sun, Linsky, J.L. and Stencel, R.E. (eds.), Springer-Verlag Berlin, p 422.
Walter, F.M., Schrijver, C.J., 1987, in in Cool Stars, Stellar Systems, and the Sun, Linsky, J.L. and Stencel, R.E. (eds.), Springer-Verlag, p 262.
Walter, F.M., et al., 1988, Astron. J. 96, 297.

Related content

Powered by UNSILO

Observational Constraints on Dynamos in Cool Stars

  • C.J. Schrijver (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.