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Ultraviolet observations of RR Telescopii

Published online by Cambridge University Press:  12 April 2016

D. Ponz ,
A. Cassatella  and
R. Viotti
D. Ponz
Affiliation:
Astronomy Division ESTEC, Villafranca Satellite Tracking, Station of ESA, Madrid, Spain
A. Cassatella
Affiliation:
Astronomy Division ESTEC, Villafranca Satellite Tracking, Station of ESA, Madrid, Spain
R. Viotti
Affiliation:
Istituto Astrofisica Spaziale, CNR, Prascati, Italy

Extract

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The ultraviolet spectrum of RR Tel was extensively studied with the IUE satellite since 1978 in both the high and low resolution modes. A comprehensive study of these observations was made by Penston et al.(l98l) who measured more than 400 emission lines. As it is clearly shown in figure 1, the UV spectrum of this symbiotic star is very rich in emission lines. Like in the optical spectrum (Thackeray 1977), the UV spectrum presents emission lines of ions belonging to a wide range of ionization energies, from neutral up to four and five times ionized species (OV, MgV, CaVI, etc.). Permitted, intercombination and forbidden transitions were found which may allow a diagnosis of the physical conditions of the emitting regions. Electron temperatures of 1.2-1.9 104°K and densities of 106-108 cm-3 were derived by Penston et al.

Type
Session II – Discussion on Individual Stars
Information
International Astronomical Union Colloquium , Volume 70: The Nature of Symbiotic Stars , 1982 , pp. 217 - 218
Copyright
Copyright © Reidel 1982

References

Altamore, A., Baratta, G.B., Cassatella, A., Friedjung, M., Giangrande, A., Ricciardi, O., Viotti, R.: 1981, Astrophys.J. 245, 630 CrossRefGoogle Scholar
Friedjung, M.: 1966, Mon. Not. R. astr. Soc. 133, 401 Google Scholar
Keyes, C.D., Plavec, M.J.: 1980, The Universe at UV Wavelengths, NASA,443 Google Scholar
Penston, M.V., Benvenuti, P., Cassatella, A., Heck, A., Selvelli, P.L., Beeckmans, P., Macchetto, F., Ponz, D., Jordan, C, Cramer, N., Rufener, P., Manfroid, J.: 1981, Mon. Not. R. astr. Soc. in pressGoogle Scholar
Thackeray, A.D.; 1977, Mem. R. astr. Soc. 83, 1 Google Scholar