Hostname: page-component-cd9895bd7-q99xh Total loading time: 0 Render date: 2024-12-25T16:24:08.308Z Has data issue: false hasContentIssue false
  • English
  • Français

What Do We Know Through Spectral Information on Stellar Chromospheres and Coronas?

Published online by Cambridge University Press:  08 February 2017

Françoise Praderie
Françoise Praderie*
Affiliation:
Observatoire de Paris, Section d 'Astrophysique de Meudon

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Four problems in interpreting spectra to infer chromospheres-coronas are summarized. (1) The a priori difficulties in interpreting spectra lie in uncertainty on the range of possible models, coming from uncertainty as to which conservation equations may be applied, and from lack of an exhaustive list of spectral indicators that may be used for uniqueness tests. (2) As spectral indicators we consider: emission lines, self-reversed emission cores, the presence of He I lines in stars not of early type, coronal-type high ionization, excess continuum emission in the rocket UV and the far infrared. (3) To determine what we can infer from observations, we summarize information: inferred by comparison of models to data, on velocity fields, and on spectral variability which might suggest chromospheric activity. (4) We summarize the evidence for chromospheres in A stars, as being those where convection-induced acoustic heating is marginal.

Keywords

chromosphercoronspectral indicatorconservation equations
Type
Part C. Chromospheres and Coronae of Stars
Information
International Astronomical Union Colloquium , Volume 2: Spectrum Formation in Stars With Steady-State Extended Atmospheres , August 1970 , pp. 239 - 258
Copyright
Copyright © 1970

References

Adams, W. S., and Joy, A. H. 1933, PASP, 45, 301.Google Scholar
Athay, R. G. 1963, Ap. J. 137, 931.Google Scholar
Athay, R. G. and Skumanich, A. 1968b, Ap. J. 152, 141.Google Scholar
Athay, R. G. , and Skumanich, A. 1968a, Solar Phys., 3, 181.Google Scholar
Baglin, A., Praderie, F., and Perrin, M. N. 1968, Comm. presented at the Budapest Symposium on Non-Periodic Phenomena in Variable Stars.Google Scholar
Baschek, B., and Reimers, D. 1969, Astr. and Astrophys. 2, 240.Google Scholar
Bloch, M. 1964, Ann. Astr. 27, 292.Google Scholar
Bochonko, D. R., and Malville, J. 1968, PASP, 80, 177.Google Scholar
Bonsack, W. K., and Culver, R. B. 1966, Ap. J. 145, 767.Google Scholar
Boyarchuk, A. A. 1964, Variable. State, 15, 48.Google Scholar
Boyarchuk, A. A. 1966, Astrofisika, 2, 101.Google Scholar
Boyarchuk, A. A. 1967, Izv. Krim. Astr. Obs. 37.Google Scholar
Cayrel, R. 1963, C. R. A. S. 257, 3309.Google Scholar
Cuny, Y. 1968, Sol. Phys. 3, 204.Google Scholar
Delache, P. 1967, Ann. Astr. 30, 827.Google Scholar
Deutsch, A. J. 1959, Ap. J. 129, 570.Google Scholar
Deutsch, A. J. 1967, PASP, 79, 431.Google Scholar
Deutsch, A. J. 1969, Comm. presented at the Lunteren Symposium.Google Scholar
Dumont, S. 1967, Ann. Astr. 30, 421.Google Scholar
Feautrier, P. 1968, Ann. Astr. 30, 257.Google Scholar
Gillet, F. G., Low, F. J., and Stein, W. A. 1968, Ap. J. 154, 677.Google Scholar
Griffin, R. F. 1963, Observatory, 83, 255.Google Scholar
Henize, K. G., Wackerling, L. R., O'Callaghan, F. G. 1967, Science, 155, 1407.Google Scholar
Henry, R. C. 1967, Princeton University, Thesis.Google Scholar
Hyland, A. R. 1967, Canberra University, Thesis.Google Scholar
Jefferies, J. T. 1968, Spectral line Formation, Blaisdell Publishing Co., New York.Google Scholar
Kandel, R. S. 1967, Ann. Astr. 30, 999.Google Scholar
Kellerman, K. I., and Pauliny-Toth, I. I. K. 1966, Ap. J. 145, 953.Google Scholar
Knappenberger, P. H., and Fredrick, L. W. 1968, PASP, 80, 96.Google Scholar
Kraft, R. P., and Edmonds, F. N. 1959, Ap. J. 129, 522.Google Scholar
Kraft, R. P., Preston, G. W., and Wolff, S. C. 1964, Ap. J. l40, 235.Google Scholar
Kraft, R. P. 1967, 5th Symposium on Cosmical Gas Dynamics, ed. Thomas, R. N., Academic Press, New York, p. 229.Google Scholar
Kuhi, L. V. 1965, Ap. J. 145, 715.Google Scholar
Lighthill, M. J. 1967, 5th Symposium on Cosmical Gas Dynamics, ed. Thomas, R. N., Academic Press, New York, p. 429.Google Scholar
Liller, W. 1968, Ap. J. 151, 589.Google Scholar
Low, F. J. 1965, IAU Circ. No. 1884-85.Google Scholar
McConnell, J. 1967, PASP, 79, 66 Google Scholar
Miller, F. D. 1954, A. J. 58, 222.Google Scholar
Morton, D. C. 1967, Ap. J., 147, 1017; 1967, Ap. J. 150, 535.CrossRefGoogle Scholar
Morton, D. C., Jenkins, E. B., and Bohlin, R. C. 1968, Ap. J. 154, 661.Google Scholar
Nariai, K. 1968, preprint.Google Scholar
Noyes, R. W., Gingerich, O., and Goldberg, L. 1966, Ap. J. 145, 344.CrossRefGoogle Scholar
Oster, L., and Patterson, N. P. 1968, J.Q.R.S.T. 8, 305.Google Scholar
Parker, E. N. 1963, Interplanetary Dynamical Processes, Interscience Publishers, New York.Google Scholar
Praderie, F. 1967, Ann. Astr. 30, 773.Google Scholar
Sahade, J. 1960, Stars and Stellar Systems, vol. 6, 494.Google Scholar
Searle, L., and Sargent, W. L. W. Ap. J. 139, 799.Google Scholar
Smith, A. M. 1969, Ap. J. 156, 93.Google Scholar
Stein, W. A., Gaustad, J. E., Gillett, F. C., and Knacke, R. F. 1969, Ap. J. 155, L3.Google Scholar
Vaughan, A. H., and Zirin, H. 1968, Ap. J. 152, 123.Google Scholar
Warner, B., 1966, Observatory, 86, 82.Google Scholar
Warner, B. 1968, Observatory, 88, 217.Google Scholar
Weymann, R. 1962, Ap. J. 136, 844.CrossRefGoogle Scholar
Weymann, R., and Chapman, G. 1965, Ap. J. 142, 1268 Google Scholar
Wilson, O. C., and Bappu, M. K. V. 1957, Ap. J. 125, 661.Google Scholar
Wilson, O. C. 1963, Ap. J. 138, 832.Google Scholar
Wilson, O. C., and Skumanich, A. 1964, Ap. J. 140, 1401.Google Scholar
Wilson, O. C. 1966, Ap. J. 144, 695.Google Scholar
Wilson, O. C. 1968, Ap. J. 153, 221.Google Scholar
Woolf, N. J., and Ney, E. P. 1969, Ap. J. 155, L181 Google Scholar
Zirin, H. 1968, Ap. J. 152, L177.Google Scholar