Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-23T15:10:06.502Z Has data issue: false hasContentIssue false
  • English
  • Français

Flare Colours and Luminosities

Published online by Cambridge University Press:  14 August 2015

S. Cristaldi  and
M. Rodonò
S. Cristaldi
Affiliation:
Catania Astrophysical Observatory
M. Rodonò
Affiliation:
Catania Astrophysical Observatory

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.

Flare colours determined from simultaneous UBV observations made at Catania Observatory and from sequential UBV observations made at McDonald Observatory are presented. They fit fairly well with the theoretical colours computed according to the Gurzadian's (1970) non-thermal model. Only part of the observed flare colours are consistent with the solar type models by Gershberg (1967) and Kunkel (1970).

From a B-band patrol of UV Cet-type stars carried out from 1967 to 1972, some quantitative estimates of flare frequencies and luminosities and of their average contribution to the stellar radiation are given.

The corresponding parameters for the Sun, which were estimated from ‘white light’ flare activity, are also given for comparison. The Sun and V 1216 Sgr can be regarded as low-activity flare stars of the type found by Kunkel (1973).

Type
Part 1 / Flare Stars and T Tauri Stars
Information
Symposium - International Astronomical Union , Volume 67: Variable Stars and Stellar Evolution , 1975 , pp. 75 - 89
Copyright
Copyright © Reidel 1975 

References

Allen, C. W.: 1973, Astrophysical Quantities, 3rd. ed., The Athlone Press, London, p. 162.Google Scholar
Andrews, A. D.: 1969a, Info. Bull. Var. Stars, No. 342.Google Scholar
Andrews, A. D.: 1969b, Info. Bull. Var. Stars, No. 370.Google Scholar
Blanco, C., Catalano, S., Marilli, E., and Rodonò, M.: 1974, Astron. Astrophys. 33, 257.Google Scholar
Blanco, V. M., Demers, S., Douglass, G. G., and FitzGerald, M. P.: 1968, Photoelectric Catalogue, U.S. Naval Obs. Publ. II Series 21.Google Scholar
Cristaldi, S. and Rodonò, M.: 1970, Astron. Astrophys. Suppl. 2, 223.Google Scholar
Cristaldi, S. and Rodonò, M.: 1973, Astron. Astrophys. Suppl. 10, 47.Google Scholar
Eggen, O. J.: 1968, Roy. Obs. Bull. 137.Google Scholar
Gershberg, R. E.: 1964, Izv. Krymsk. Astrofiz. Obs. 32, 133.Google Scholar
Gershberg, R. E.: 1965, Izv. Krymsk. Astrofiz. Obs. 33, 206.Google Scholar
Gershberg, R. E.: 1967, Astrofizika 3, 127.Google Scholar
Gliese, W.: 1969, Catalogue of Nearby Stars, Veröff. Astron. Rechen Inst. Heidelberg No. 22.Google Scholar
Gurzadian, G. A.: 1965, Astrofizika 1, 313.Google Scholar
Gurzadian, G. A.: 1970, Bol. Obs. Tonantzintla Tacubaya 5, 255.Google Scholar
Gurzadian, G. A.: 1972, Astron. Astrophys. 20, 145.Google Scholar
Kunkel, W.: 1970, Astrophys. J. 161, 503.Google Scholar
Kunkel, W.: 1973, Astrophys. J. Suppl. 25, 1.CrossRefGoogle Scholar
Michard, R.: 1959, Ann. Astrophys. 22, 887.Google Scholar
Nather, R. E. and Warner, B.: 1971, Monthly Notices Roy. Astron. Soc. 152, 204.Google Scholar
Owen, F. N., Bopp, B. W., and Moffett, I. J.: 1972, Astrophys. Letters 10, 37.Google Scholar
Rodonò, M.: 1973, Boll. Soc. Ital. Fisica 99, 95.Google Scholar
Skumanich, R.: 1972, Astrophys. J. 171, 565.Google Scholar
Smith, H. J. and Smith, E. V. P.: 1963, Solar Flares, McMillan Co., New York, p. 71.Google Scholar
Warner, B.: 1971, in ‘New Directions and New Frontiers in Variable Star Research’, IAU Colloq. 15, Veröff. Bamberg 9, 144.Google Scholar