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Theory and Observations of Negative Preflares in UV Cet Stars

Published online by Cambridge University Press:  12 April 2016

V.P. Grinin
V.P. Grinin*
Affiliation:
Crimean Astrophysical Observatory, USSR

Extract

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Negative preflares (NPFs) of UV Cet stars, which were first observed by Italian astronomers |1|, are a highly unusual type of preflare activity without direct analogy in solar flares. The rarity of these events in the visual region leads to difficulties in statistical investigations. At present one can consider as reliably established only that the mean NPF-amplitudes increase and the probability of their appearance decreases with a shift toward blue |2|. According to |3| NPFs are observed mainly before flares of smaller amplitudes. Beginning in 1974 at the Crimea and the Astronomical Institute of Tashkent a series of works on the theory and observation of NPFs was carried out. A short review of these is given below.

Type
Session IV: Theoretical Aspects
Information
International Astronomical Union Colloquium , Volume 71: Activity in Red-Dwarf Stars , 1983 , pp. 613 - 615
Copyright
Copyright © Reidel 1983

References

REFERENCES

1. Cristaldi, S., Rodonò, M.: 1969, in “Non Periodic Phenomena in Variable Stars”, IAU Coll., ed. Detre, L., Acadamic Press, Budapest, p. 149.Google Scholar
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3. Shevchenko, G.G.: 1973, Astron. Cire, No.792, 2.Google Scholar
4. Grinin, V.P.: 1973, Izv. Frym. Astr. Obs. 48, 58.Google Scholar
5. Grinin, V.P.: ibid. 55, 179 Google Scholar
6. Brujevich, V.V. et al.: 1980, ibid. 61, 90.Google Scholar
7. Kiljachkov, N.N., Shevchenko, V.S.: 1976, Soviet. Astron. Letters., 2, 494.Google Scholar
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10. Giampapa, M.S., Africano, J.L., Klimke, A., Parks, J., Quiglay, R.J., Robinson, R.D., Worden, S.P.: 1982, Astrophys, J. 252, L39.Google Scholar