Publication: Emissions from the transition regions and coronae of three cool dwarf stars
Loading...
Official URL
Full text at PDC
Publication Date
1983
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
EDP Sciencies
Citations
Exportar
Abstract
Ultraviolet emissions of τCet, δPav, and 61 Cyg A have been analysed to determine the structure of their outer atmospheres.
Emission line fluxes are used to find the emission measure distributions. Using two boundary values of the electron pressure, models of the transition region have been derived. In the two models of τCet the net conductive flux is less than the radiation losses at all temperatures. However, for δPav and 61 Cyg A the model with the upper boundary value of the electron pressure has a temperature range where the radiative losses are less than the net conductive fluxes. Measured X-ray fluxes are used to test the coronal temperature values derived from the ultraviolet observations.
Description
© European Southern Observatory.
We would like to thank an anonymous referee for useful comments.
UCM subjects
Unesco subjects
Keywords
Citation
Ayres, T., Linsky, J.L.: 1980, Astrophys. J. 235, 76
Ayres, T.R., Marstad, N.C., Linsky, J.L.: 1981, Astrophys. J. 247, 545
Barnes, J.G., Evans, D.S.: 1976, Monthly Notices Roy. Astron. Soc. 174, 489
Barnes, J.G., Evans, D.S., Parsons, S.B.: 1976, Monthly Notices Roy. Astron. Soc. 174, 503
Bogges, A., Carr, F.A., Evans, D.C., Fischel , D., Freeman, H.R., Fuechsel, C.F., Klinglesmith, D.A., Krueger, V.L., Longanecker, G.W., Moore, J.V., Pyle, A.B., Rebar, F., Sizemore, K.O., Sparks, W., Underhill, A.B., Vitagliano, H.D., West, D.K., Macchetto, F., Fitton, B., Barker, P.J., Dunford, E., Gond halekar, P.M., Hall, J .E., Harrison, V.A.W., Oliver, M.B., Sandford, M.C.W., Vaughan, P.A., Ward, A.K., Anderson, B.E., Boksenberg, A., Coleman, C.I., Snijders, M.A.J., Wilson, R.: 1978, Nature 275, 372
Bohlin, R.C., Holm, A.: 1980, IUE NASA Newsletter No. 10, p. 37
Brown, A., Jordan, C.: 1981, Monthly Notices Roy. Astron. Soc. 196, 757
Castro, E., Fernández Figueroa, M.J., Rego, M., Ponz, D.: 1981, Astron. Astrophys. 102, 207
Dupree, A.K., Hartmann, L.: 1980, in Stellar Turbulence, IAU Coll. 51, eds. D. F. Gray and J. L. Linsky, Springer, Berlín, Heidelberg, New York, p. 279
Fernández Figueroa, M.J., Castro, E., Rego, M.: 1982, ESA SP-176, p. 157
Giacconi, R., Branduardi, G., Briel, U., Epstein, A., Frabricant, D., Feigelson, E., Forman, W., Gorenstein, P., Grindlay, J., Gursky, H., Harnden, F.R., Henry, J.P., Jones, C., Kellogg, E., Kock, D., Murray, S., Schreier, E., Seward, F., Tananbaum, H., Topka, K., Van Speybroeck, L., Holt, S.S., Becker, R.H., Boldt, E.A., Serlemitsos, P.J., Clark, G., Cañizares, C., Market, T., Novick, R., Helfand, D., Long, K.: 1979, Astrophys. J. 230, 540
Haisch, B.M., Linsky, J.L.: 1976, Astrophys. J. 205, L 39 Hearnshaw, J.B.: 1974, Astron. Astrophys. 34, 263 Hearnshaw, J.B.: 1975, Astron. Astrophys . 38, 271
Johnson, H.M.: 1981, Astrophys. J. 243, 234
Johnson , H.L., Mitchell, R.I., Iriarte, D.: 1966, Comm. Lunar Planetary Lab. 4, 99
Jordan, C.: 1969, Monthly Notices Roy. Astron. Soc. 142, 501
Jordan, C.: 1980a, Higlights of Astronomy, Reidel, Dordrecht, Vol. 5, p. 533
Jordan, C.: 1980b, Astron. Astrophys. 86, 355
Jordan, C., Wilson , R.: 1971, Physics of the Solar Corona p. 211, ed. C.J. Macris, Reidel, Dordrecht
Linsky, J.L., Haisch, B.M.: 1979, Astrophys. J. 229, L 27
Linsky, J.L., Worden, S.P., McClintock, W., Robertson, R.M.: 1979, Astrophys. J. Suppl. 41, 47
Mullan, D.J.: 1976, Astrophys. J. 209, 171
Oinas, V.: 1977, Astron. Astrophys. 61, 17
Raymond, J.C., Smith, B.W.: 1977, Astrophys. J. Suppl. 35, 419
Simon, T., Linsky, J.L., Stencel, R.: 1982, Astrophys. J. 257, 225
Vaiana, G.S., Cassinelli, J.P., Fabbiano, G., Giacconi, R., Golub, L., Gorenstein, P., Haisch, B.M., Harnden, F.R ., Johnson, H.M., Linsky, J.L., Maxson, C.W., Mewe, R., Rosner, R., Seward, F., Topka, K., Zwaan , C.: 1981, Astrophys. J. 245, 163
Wilson, O.C., Bappu, M.K.V.: 1957, Astrophys. J. 125, 661
Zirin, H.: 1976, Astrophys. J. 208, 414