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The Quiescent Chromospheres and Transition Regions of Active Dwarf Stars: What Are We Learning from Recent Observations and Models?

Published online by Cambridge University Press:  12 April 2016

Jeffrey L. Linsky
Jeffrey L. Linsky*
Affiliation:
Joint Institute for Laboratory Astrophysics National Bureau of Standards and University of Colorado, Boulder, Colorado 80309 USA

Abstract

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I will review the rapid progress in our understanding of active dwarf stars, which has been stimulated by recent IUE, Einstein, and ground-based observations, by asking a series of questions. The most fundamental question is the extent to which magnetic fields control nonflare phenomena in these stars. There are a number of aspects to this question:

(1) What is the evidence for large scale magnetic structures similar to solar plages in these stars and how does a plage system differ from a quiescent spectrum?

(2) Can the enhanced heating in these stars be explained by solar-like magnetic flux tubes?

(3) What roles do systematic flows play in active dwarf atmospheres?

(4) What Is the relation between heating rates in different layers of these stars?

(5) By what mechanisms are active dwarf chromospheres and transition regions heated?

(6) What are semiempirical models telling us about active dwarf stars?

Recent observations are permitting us to begin to answer these questions.

Type
Session I: General Characteristics of Active Dwarfs
Information
International Astronomical Union Colloquium , Volume 71: Activity in Red-Dwarf Stars , 1983 , pp. 39 - 60
Copyright
Copyright © Reidel 1983

References

Avrett, E.H.: 1981, in “Solar Phenomena in Stars and Stellar Systems,” eds. Bonnet, R.M. and Dupree, A.K. (Dordrecht: Reidel), p. 173.CrossRefGoogle Scholar
Ayres, T.R., Linsky, J.L., Simon, T., Jordan, C., and Brown, A.: 1982a, in preparation.Google Scholar
Ayres, T.R., Marstad, N.C., and Linsky, J.L.: 1981, Ap. J. 247, p. 545.CrossRefGoogle Scholar
Ayres, T.R., Stencel, R.E., Linsky, J.L., Simon, T., Jordan, C, Brown, A., and Engvold, O.: 1982b, in preparation.Google Scholar
Baliunas, S.L., Avrett, E.H., Hartmann, L., and Dupree, A.K.: 1979, Ap. J. (Letters) 233, p. L129.CrossRefGoogle Scholar
Baliunas, S.L., and Dupree, A.K.: 1982, Ap. J. 252, p. 668.CrossRefGoogle Scholar
Baliunas, S.L., Hartmann, L., Vaughan, A.H., Liller, W., and Dupree, A.K.: 1981, Ap. J. 246, p. 473.CrossRefGoogle Scholar
Basri, G.S., Linsky, J.L., Bartoe, J.-D.F., Brueckner, G.E., and Van Hoosier, M.E.: 1979, Ap. J. 230, p. 924.CrossRefGoogle Scholar
Brueckner, G.E.: 1981, in “Solar Active Regions,” ed. Orrall, F.Q. (Boulder: Colorado Assoc. Univ. Press), p. 113.Google Scholar
Brueckner, G.E., Bartoe, J.-D.F., and Van Hoosier, M.E.: 1977, in “Proceedings of the OSO-8 Workshop,” eds. Hansen, E. and Schaffner, S. (Boulder, IASP), p. 380.Google Scholar
Butler, C.J., Byrne, P.B., Andrews, A.D., and Doyle, J.G.: 1981, Monthly Notices Roy. Astron. Soc. 197, p. 815.CrossRefGoogle Scholar
Byrne, P.B., Butler, C.J., Andrews, A.D., Linsky, J.L., Simon, T., Marstad, N., Rodono, M., Blanco, C., Catalano, S., and Marilli, E.: 1982, in “Proceedings of the Third European IUE Conference,” in press.Google Scholar
Chapman, G.A.: 1977, Ap. J. Suppl. Ser. 33, p. 35.CrossRefGoogle Scholar
Chapman, G.A.: 1979, Ap. J. 232, p. 923.CrossRefGoogle Scholar
Chapman, G.A.: 1981, in “Solar Active Regions,” ed. Orrall, F.Q. (Boulder: Colorado Assoc. Univ. Press), p. 43.Google Scholar
Cram, L.E.: 1982, Ap. J. 253, p. 768.CrossRefGoogle Scholar
Cram, L.E. and Mullan, D.J.: 1979, Ap. J. 234, p. 579.CrossRefGoogle Scholar
Dere, K.: 1982, Solar Phys. 77, p. 77.CrossRefGoogle Scholar
Doschek, G.A. and Feldman, U.: 1977, Ap. J. Suppl. 35, p. 471.CrossRefGoogle Scholar
Doschek, G.A., Feldman, U., and Bohlin, J.D.: 1976, Ap. J. (Letters) 205, p. L177.CrossRefGoogle Scholar
Dupree, A.K.: 1981, in “Solar Phenomena in Stars and Stellar Systems,” eds. Bonnet, R.M. and Dupree, A.K. (Dordrecht: Reidel), p. 407.CrossRefGoogle Scholar
Dupree, A.K.: 1982, in “Advances in Ultraviolet Astronomy: Four Years of IUE Research” (in press).Google Scholar
Feldman, U., Cohen, L., and Doschek, G.A.: 1982, Ap. J. 255, p. 325.CrossRefGoogle Scholar
Fosbury, R.A.E.: 1974, Monthly Notices Roy. Astron. Soc. 169, p. 147.CrossRefGoogle Scholar
Frazier, E.N. and Stenflo, J.O.: 1973, Solar Phys. 27, p. 330.CrossRefGoogle Scholar
Giampapa, M.S., Worden, S.P., and Linsky, J.L.: 1982, Ap. J. (in press).Google Scholar
Haisch, B.M., Linsky, J.L., Bornmann, P.L., Stencel, R.E., Golub, L., and Antiochos, S.K.: 1982, Ap. J. (submitted).Google Scholar
Hall, D.S.: 1981, in “Solar Phenomena in Stars and Stellar Systems,” eds. Bonnet, R.M. and Dupree, A.K. (Dordrecht: Reidel), p. 431.CrossRefGoogle Scholar
Hallam, K.L. and Wolff, C.L.: 1981, Ap. J. (Letters) 248, p. L73.CrossRefGoogle Scholar
Hammer, R., Linsky, J.L., and Endler, F.: 1982, in “Advances in Ultraviolet Astronomy: Four Years of IUE Research” (in press).Google Scholar
Hartmann, L., Dupree, A.K., and Raymond, J.C.: 1982, Ap. J. 252, p. 214.CrossRefGoogle Scholar
Helfand, D.J. and Caillault, J.P.: 1982, Ap. J. 253, p. 760.CrossRefGoogle Scholar
Imhoff, C.L. and Giampapa, M.S.: 1982, in “Advances in Ultraviolet Astronomy: Four Years of IUE Research” (in press).Google Scholar
Kelch, W.L. and Linsky, J.L.: 1978, Solar Phys. 58, p. 37.CrossRefGoogle Scholar
Kelch, W.L., Linsky, J.L., and Worden, S.P.: 1979, Ap. J. 229, p. 700.CrossRefGoogle Scholar
Kunkel, W.W.: 1975, in “Variable Stars and Stellar Evolution,” eds. Sherwood, V.E. and Plaut, L. (Dordrecht: Reidel), p. 15.CrossRefGoogle Scholar
Lang, K.R.: 1980, “Astrophysical Formulae,” 2nd ed. (Berlin: Springer-Verlag), p. 510.CrossRefGoogle Scholar
Linsky, J.L.: 1980, Ann. Rev. Astr. Ap. 18, p. 439.CrossRefGoogle Scholar
Linsky, J.L.: 1981a, in “Solar Phenomena in Stars and Stellar Systems,” eds. Bonnet, R.M. and Dupree, A.K. (Dordrecht: Reidel), p. 99.CrossRefGoogle Scholar
Linsky, J.L.: 1981b, in “Effects of Mass Loss on Stellar Evolution,” eds. Chiosi, C. and Stallo, R. (Dordrecht: Reidel), p. 187.CrossRefGoogle Scholar
Linsky, J.L.: 1981c, in “Physical Processes in Red Giants,” eds. Iben, I. Jr. and Renzini, A. (Dordrecht: Reidel), p. 247.CrossRefGoogle Scholar
Linsky, J.L.: 1981d, in “X-ray Astronomy in the 1980’s,” NASA Technical Memorandum 83848, p. 13.Google Scholar
Linsky, J.L.: 1982, in “Advances in Ultraviolet Astronomy: Four Years of IUE Research” (in press).Google Scholar
Linsky, J.L. and Ayres, T.R.: 1978, Ap. J. 220, p. 619.CrossRefGoogle Scholar
Linsky, J.L., Bornmann, P.L., Carpenter, K.G., Wing, R.F., Giampapa, M.S., and Worden, S.P.: 1982, Ap. J. (in press).Google Scholar
Machado, M.E., Avrett, E.H., Vernazza, J.E., and Noyes, R.W.: 1980, Ap. J. 242, p. 336.CrossRefGoogle Scholar
Marcy, G.W.: 1983, in “Solar and Stellar Magnetic Fields: Origins and Coronal Effects (Proceedings of IAU Symp. 102, Stenflo, J.(ed.)).Google Scholar
Marstad, N. et al.: 1982, in “Advances in Ultraviolet Astronomy: Four Years of IUE Research” (in press).Google Scholar
Morrison, N.D. and Linsky, J.L.: 1978, Ap. J. 222, p. 723.CrossRefGoogle Scholar
Oranje, B.J., Zwaan, C, and Middelkoop, F.: 1982, Astr. Ap. (in press).Google Scholar
Owocki, S.P. and Auer, L.H.: 1980, Ap. J. 241, p. 448.CrossRefGoogle Scholar
Pneuman, G.W. and Kopp, R.A.: 1977, Astr. Ap. 55, p. 305.Google Scholar
Rosner, R., Tucker, W.H., and Vaiana, G.S.: 1978, Ap. J. 220, p. 643.CrossRefGoogle Scholar
Roussel-Dupre, D. and Shine, R.A.: 1982, Solar Phys. 77, p. 329.CrossRefGoogle Scholar
Schindler, M., Kjeldseth-Moe, O., Bartoe, J.-D.F., Brueckner, G.E., and Van Hoosier, M.E.: 1982, Ap. J. (submitted).Google Scholar
Shine, R.A. and Linsky, J.L.: 1974, Solar Phys. 39, p. 49.CrossRefGoogle Scholar
Simon, T., Kelch, W.L., and Linsky, J.L.: 1980b, Ap. J. 237, p. 72.CrossRefGoogle Scholar
Simon, T. and Linsky, J.L.: 1980, Ap. J. 241, p. 759.CrossRefGoogle Scholar
Simon, T., Linsky, J.L., and Schiffer, F.H. III: 1980a, Ap. J. 239, p. 911.CrossRefGoogle Scholar
Skumanich, A., Smythe, C., and Frazier, E.N.: 1975, Ap. J. 200, p. 747.CrossRefGoogle Scholar
Stencel, R.E., Linsky, J.L., and Ayres, T.R.: 1982a, in “Advances in Ultraviolet Astronomy: Four Years of IUE Research” (in press).Google Scholar
Stencel, R.E., Linsky, J.L., Ayres, T.R., Jordan, C., and Brown, A.: 1982b, Ap. J. (submitted).Google Scholar
Stencel, R.E., Mullan, D.J., Linsky, J.L., Basri, G.S., and Worden, S.P.: 1980, Ap. J. Suppl. 44, p. 383.CrossRefGoogle Scholar
Stenflo, J.O.: 1973, Solar Phys. 32, p. 41.CrossRefGoogle Scholar
Stenholm, L.G. and Stenflo, J.O.: 1977, Astr. Ap. 58, p. 273.Google Scholar
Stein, R.F.: 1981, Ap. J. 246, p. 966.CrossRefGoogle Scholar
Ulmschneider, P. and Stein, R.F.: 1982, Astr. Ap. 106, p. 9.Google Scholar
Vaiana, G.S. et al.: 1981, Ap. J. 245, p. 163.CrossRefGoogle Scholar
Vaughan, A.H., Baliunas, S.L., Middelkoop, F., Hartmann, L.W., Mihalas, D., Noyes, R.W., and Preston, G.W.: 1981, Ap. J. 250, p. 276.CrossRefGoogle Scholar
Vernazza, J.E., Avrett, E.H., and Loeser, R.: 1981, Ap. J. Suppl. 45, p. 635.CrossRefGoogle Scholar
Vernazza, J.E. and Reeves, E.M.: 1978, Ap. J. Suppl. Series 37, p. 485.CrossRefGoogle Scholar
Vogt, S.S.: 1983, this volume.Google Scholar
Wallenhorst, S.G.: 1980, Ap. J. 241, p. 229.CrossRefGoogle Scholar
Wallenhorst, S.G.: 1981, Ap. J. 249, p. 176.CrossRefGoogle Scholar
Walter, F.M., Basri, G.S., and Laurent, R.: 1982, in “Advances inUltraviolet Astronomy: Four Years of IUE Research” (in press).Google Scholar
White, O.R. and Livingston, W.C.: 1981, Ap. J. 249, p. 798.CrossRefGoogle Scholar
Wilson, O.C.: 1978, Ap. J. 226, p. 379.CrossRefGoogle Scholar