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Evidence for Stellar Chromospheres Presented by Ultraviolet Observations of the Sun and Stars

Published online by Cambridge University Press:  06 September 2019

Lowell Doherty
Lowell Doherty*
Affiliation:
Space Astronomy Laboratory, Washburn Observatory, University of Wisconsin

Extract

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I would like to describe observations of emission lines in stellar sources, in the ultraviolet region of the spectrum not accessible to ground observation. As we have heard, the interpretation of emission lines may involve both geometrical and temperature effects, so that the occurrence of emission lines does not constitute prima facie evidence for chromospheres. On the other hand, we have not yet, at this conference, formulated a definition of a chromosphere that excludes any particular category of stellar emission-line objects.

In principle, information on chromospheric structure is also contained in the continuum. However, the measurement of accurate spectral energy distributions depends on the very difficult process of ultraviolet photometric calibration. This work is continuing both at Goddard and the University of Wisconsin.

Type
Part II: Observational Evidence for Stellar Chromospheres
Information
International Astronomical Union Colloquium , Volume 19: Stellar Chromospheres , February 1973 , pp. 99 - 124
Copyright
Copyright © Nasa 1972

References

References

Bless, R.C. and Code, A.D. 1972, Ann. Rev. Astron. Astrophys., in press.Google Scholar
Bohlin, R.C. 1970, Astrophys. J., 162 571.Google Scholar
Carruthers, G.R. 1971, Astrophys. J., 166, 349.Google Scholar
Code, A.D. 1972, in Sci. Results of OAO-2, ed. Code, A.D. (Washington: U.S. Government Printing Office), in press.Google Scholar
Doherty, L.R. 1972, ibid. Google Scholar
Houck, T.E. 1972, ibid. Google Scholar
Kondo, Y. 1972, Astrophys. J., 171, 605.Google Scholar
Kondo, Y., Modisette, J.L., and Giuli, R.T. 1971, paper presented at 136th meeting of A.A.S.Google Scholar
Moos, H.W., and Rottman, G.J. 1971, ibid. Google Scholar
Morton, D.C., Jenkins, E.B., and Bohlin, R.C. 1968, Astrophys. J., 154, 661.Google Scholar
Smith, A.M. 1970, Astrophys. J., 160, 595.Google Scholar
Smith, L.F. 1972, in Sci. Results of OAO-2, ed Code, A.D. (Washington: U.S. Government Printing Office), in press.Google Scholar
Stecher, T.P. 1970, Astrophys. J., 159, 543.Google Scholar
Weyman, R. 1962, Astrophys. J, 136, 844.Google Scholar
Wilson, R. and Boksenberg, A. 1969, Ann. Rev. Astron. Astrophys., 7, 421.Google Scholar

References

Abt, H.A. 1962, Ap. J. 135, 424.Google Scholar
Abt, H.A. 1970, Ap.J.Suppl. 19, 387 Google Scholar
Doherty, L.R. 1971, Phil. Trans. Roy, Soc. Lon. A.270, 189.Google Scholar
Gibson, W.C., Guthals, D.L., Jensen, J.W. and Eccher, J.A. 1972, submitted to Rev. Sci. Instr. Google Scholar
Goldberg, L. 1954, The Solar System, II, Kuiper, G.P., ed. (Chicago: University of Chicago Press), p. 434.Google Scholar
Hoffleit, D. 1964, Catalogue of Bright Stars (New Haven: Yale University Observatory).Google Scholar
Jones, H.S. 1928, M.N.R.A.S. 88, 403.Google Scholar
Kondo, Y. 1972, ApJ. 171, 605.Google Scholar
Kondo, Y., Giuli, R.T., Modisette, J.L. and Rydgren, A.E. 1972, submitted to ApJ. Google Scholar
Kraft, R.P. and Edmonds, F.N. Jr. 1959, Ap. J. 129, 522.Google Scholar
Lemaire, P. 1970, in Ultraviolet Stellar Spectra and Related Ground-based Observations, Houziaux, L. and Butler, H.E., ed. (Dordrecht: D. Reidel Pub. Co.), p. 250.Google Scholar
Linsky, J.L. 1972, IAU Colloguium No. 19, in press.Google Scholar
Purcell, J.D., Boggess, A. III and Tousey, R. 1961, Ann. Intern. Geophys. Year 12, Part II, 627 Google Scholar
Stromgren, B. 1963, Basic Astronomical Data, Aa Strand, K., ed. (Chicago: University of Chicago Press), p. 123.Google Scholar
Stromgren, G. and Perry, C.L. 1965, Photoelectric uvby Photometry for 1217 Stars Brighter than 6m. 5, unpublished.Google Scholar
Wells, C.W., Bottema, M. and Ray, A.J. 1972, submitted to Applied Optics. Google Scholar
Wilson, O.C. and Bappu, M.K.V 1957, Ap. J. 125, 661.Google Scholar
Wilson, O.C. 1966, Ap. J. 144, 695.Google Scholar
Wood, D.B. and Forbes, J.E. 1963, A.J. 68, 257.Google Scholar