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Observations Bearing on Convection

Published online by Cambridge University Press:  15 February 2018

K.H. Böhm*
Affiliation:
University of Washington, Seattle, WA., U.S.A.

Summary

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  • 1. Solar observations contain a considerable amount of information on the hydrodynamics of stellar convection. We emphasize and discuss especially

  • (a)the existence of two very different cell sizes,

  • (b) the unexpectedly high cross-correlation between vertical velocities and temperature fluctuations in the granulation,

  • (c) the fast "downdrafts" in intergranular regions,

  • (d) the existence of cells much larger than the scale height,

  • (e) the strange behavior of the temperature fluctuations in the supergranulation, and

  • (f) the importance of convective overshoot.

  • 2. The Li-Be problem and its possible relevance as an indicator of convective overshoot is briefly summarized.

  • 3. Convection may have a stronger influence on the observable properties of Herich (“non-DA”) white dwarfs than of most other stars. We discuss especially

  • (a) the persistence of outer convection zones through a very wide range of effective temperatures,

  • (b) the occurence of convection in high layers of the atmosphere,

  • (c) the relatively high efficiency of convection in white dwarf atmospheres, and

  • (d) the relevance of convection to the cooling problem.

Type
III. Observational Aspects
Copyright
Copyright © 1976

References

Altrock, R.C. and Musman, S. 1976, Ap J. 20338, 533 CrossRefGoogle Scholar
Ando, H. and Osaki, Y. 1975, P.A.S.J. 2738, 581 Google Scholar
Baglin, A. and Vauclair, G. 1973, Astron. Astrophys. 2738, 307 Google Scholar
Beckers, J.M. 1968, Solar Phys. 538, 108 Google Scholar
Beckers, J.M. and Canfield, R.C. 1976, in Physique des Mouvements dans les Atmospheres Stellaires (ed. Cayrel, R. and Steinberg, M.) Editions du C.N.R.S., p. 207 Google Scholar
Beckers, J.M. and Morrison, R.A. 1970, Solar Phys. 1438, 280 Google Scholar
Bodenheimer, P. 1965, Ap J. 14238, 451 CrossRefGoogle Scholar
Bodenheimer, P. 1966, Ap J. 14438, 103 CrossRefGoogle Scholar
Böhm, K.H. 1963, Ap J. 13838, 297.CrossRefGoogle Scholar
Böhm, K.H. 1966, Z.f. Naturforschung 21a38, 1107 CrossRefGoogle Scholar
Böhm, K.H. 1968, Astrophys. Space Sci. 238, 375 CrossRefGoogle Scholar
Böhm, K.H. 1970, Ap J. 16238, 919 CrossRefGoogle Scholar
Böhm, K.H. and Cassinelli, J.C. 1971, Astron. Astrophys. 1238, 21 Google Scholar
Böhm, K.H., Carson, T.R., Fontaine, G. and Van Horn, H.M., 1976, in preparationGoogle Scholar
Canfield, R.C. and Mehltretter, J.P. 1973, Solar Phys. 3338, 33 CrossRefGoogle Scholar
Carlier, A., Chauveau, F., Hugon, H. and Rösch, J. 1968, Comptes Rendus 26638, 199 Google Scholar
Deubner, F.L. 1971, Solar Phys. 1738, 6 CrossRefGoogle Scholar
Deubner, F.L. 1975, Astron. Astrophys. 4438, 371 Google Scholar
Deubner, F.L. 1976, Astron. Astrophys. 4738, 475 Google Scholar
Edmonds, F.N. and Webb, C.J. 1972, Solar Phys. 2538, 44 CrossRefGoogle Scholar
Fontaine, G. and Van Horn, H.M. 1976, Ap J. Suppl. 3138, 467 CrossRefGoogle Scholar
Fontaine, G., Van Horn, H.M., Böhm, K.H. and Grenfell, T.C. 1974, Ap J. 19338. 205 CrossRefGoogle Scholar
Frazier, E.N. 1968, Ap J. 15238, 557 CrossRefGoogle Scholar
Frazier, E.N. 1970, Solar Phys. 1438, 89 Google Scholar
Gingerich, O., Noyes, R.W., Kalkofen, W. and Cuny, Y. 1971, Solar Phys. 18, 347 CrossRefGoogle Scholar
Grenfell, T.C. 1972, Astron. Astrophys. 2038, 293 Google Scholar
Grenfell, T.C. 1974, Astron. Astrophys. 3138, 303 Google Scholar
Herbig, G.H. 1965, Ap J. 14138, 588 CrossRefGoogle Scholar
Koester, D. 1976, Konvektive Durchmischung und Accretion bei weissen Zwergen Habilitationsschrift KielGoogle Scholar
Lamb, D.Q. and Van Horn, H.M. 1975, Ap J. 20038, 306 CrossRefGoogle Scholar
Liu, S.Y. 1974, Ap J. 18938, 359 CrossRefGoogle Scholar
Mattig, W., Mehltretter, J.P. and Nesis, A. 1969, Solar Phys. 1038, 254 CrossRefGoogle Scholar
Mattig, W. and Nesis, A. 1974, Solar Phys. 3638, 3 CrossRefGoogle Scholar
Mattig, W. and Schlebbe, H. 1974, Solar Phys. 3438, 299 CrossRefGoogle Scholar
McIntyre, M.E. 1976 in Physique des Mouvements dans les Atmospheres Stellaires (ed. Cayrel, R. and Steinberg, M.) Editions du C.N.R.S., p. 262 Google Scholar
Mehltretter, J.P., 1971, Solar Phys. 16, 25338 Google Scholar
Muchmore, D.O. and Böhm, K.H. 1977, Astron.Astrophys. 5438, 499 Google Scholar
Musman, S. 1971, I.A.U Symposium n°. 4338, p. 289 Google Scholar
Musman, S. 1972, Solar Phys. 2638, 290 CrossRefGoogle Scholar
Musman, S. 1974, Solar Phys. 3638, 313 CrossRefGoogle Scholar
Musman, S. and Rust, D.M. 1970, Solar Phys. 1338, 261 CrossRefGoogle Scholar
Ostriker, J.P. 1971 Ann. Rev. Astron. Astrophys. 938 Google Scholar
Shipman, H.L. 1972, Ap J. 17738, 723 CrossRefGoogle Scholar
Simon, G.W. and Leighton, R.B. 1964, Ap J. 14038, 1120 CrossRefGoogle Scholar
Simon, G.W. and Weiss, N.O. 1968 a, Z. Astrophysik 6938, 435 Google Scholar
Simon, G.W. and Weiss, N.O. 1968b, in Structure and Development of Solar Active Regions (ed. Kiepenheuer, K.O.) D. Reidel, Dordrecht-Holland, P.108 CrossRefGoogle Scholar
Spiegel, E.A. 1966 a, in Stellar Evolution (ed. Stein, R.F. and Cameron, A.G.W.) New-York: Plenum Press, p. 143 Google Scholar
Spiegel, E.A. 1966 b, I.A.U. Transactions 1238 B, 539 Google Scholar
Spiegel, E.A. 1968, Highlights in Astronomy (ed. Perek, L.) Dordrecht: Reidel Publ. Co. Google Scholar
Stenflo, J.O. 1973, Solar Phys. 3238, 41 CrossRefGoogle Scholar
Strauss, J.M., Blake, J.B. and Schramm, D.N. 1976, Ap J. 20438, 481 CrossRefGoogle Scholar
Strittmatter, P.A. and Wickramasinghe, D.T. 1971, M.N.R.A.S. 15238, 47 CrossRefGoogle Scholar
Van Horn, H.M. 1970, Ap J. (letters) 16038, L 53 CrossRefGoogle Scholar
Wallerstein, G.W., Herbig, G.H. and Conti, P.S. 1965, Ap. J. 14138, 610 CrossRefGoogle Scholar
Wegner, G. 1972, Ap J. 17238, 451 CrossRefGoogle Scholar
Weidemann, V. 1975, in Problems in Stellar Atmospheres and Envelopes, (ed. Baschek, B., Kegel, W.H. and Traving, G.) Heidelberg - New-York: Springer Verlag, p. 173 CrossRefGoogle Scholar
Weymann, R. and Sears, R.L. 1965, Ap J. 14238, 174 CrossRefGoogle Scholar
Wickramasinghe, D.T. and Strittmatter, P.A. 1970, M.N.R.A.S. 15038, 435 CrossRefGoogle Scholar
Worden, S.P. 1975, Solar Phys. 4538, 521 CrossRefGoogle Scholar
Worden, P.S. and Simon, G.W. 1976, Solar Phys. (in press) abstract: Solar Phys. 4538, 547 (1975)Google Scholar
Zappala, R.R. 1972, Ap J. 17238, 57 CrossRefGoogle Scholar