Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-20T02:34:40.525Z Has data issue: false hasContentIssue false
  • English
  • Français

Two-Spot Modeling of Synoptic Light Curves of II PEG

Published online by Cambridge University Press:  12 April 2016

G. La Fauci  and
M. Rodonò
G. La Fauci
Affiliation:
Osservatorio Astrofisico and Scuola di Specializzazione in Fisica, Università di Catania, Italy
M. Rodonò
Affiliation:
Osservatorio Astrofisico and Scuola di Specializzazione in Fisica, Università di Catania, Italy

Extract

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.

The light curve (LC) of the single-line spectroscopic binary system II Peg (K2-3, IV-III) generally shows an asymmetrical and highly variable shape (Fig.l, left). Therefore, single circular spot models can be successfully applied only to symmetric LCs, as the 1977 one by Vogt (1981). When asymmetrical or almost flat LCs develop, as appears to be the rule for II Peg, at leasts two-spot modeling is required (Bopp and Noah 1980, Dorren and Guinan 1982).

From classical single-spot models (Torres and Ferraz Mello 1973, Friedman and Gurtler 1975, Bopp and Evans 1973) we have developed a computer code including two separate circular spots of different size which are allowed to assume any relative location on the stellar surface. The model is symmetric with respect to the equator. The spots are assumed to radiate as back bodies with temperature ranging from 100 to 2000 degree lower than the temperature of the unspotted photosphere (4500°K).

Type
Session II: Observed Activity in Red-Dwarfs
Information
International Astronomical Union Colloquium , Volume 71: Activity in Red-Dwarf Stars , 1983 , pp. 185 - 188
Copyright
Copyright © Reidel 1983

References

Bopp, B.W., Evans, D.S.: 1973, Monthly Not. Roy. Astron. Soc. 164, 343 CrossRefGoogle Scholar
Bopp, B.W., Noah, P.V.: 1980, Publ. Astron. Soc. Pacific. 92,717 CrossRefGoogle Scholar
Dorren, J.D., Guinan, E.F.:1902, Astrophys. J. 252, 296 CrossRefGoogle Scholar
Hartman, L., Londoño, C, Phillips, M.J.: 1979, Astrophys. J. 229, 133 CrossRefGoogle Scholar
Friedmann, C, Gurtler, J.: 1975, Astron. Nachr. 296, 125 CrossRefGoogle Scholar
Rodono, M., Pazzani, V., Cutispoto, G.: 1983, This volume.Google Scholar
Torres, C.A.O., Ferraz Mello, S.: 1973, Astron. Astrophys. 27, 331 Google Scholar
Vogt, S.S.: 1981, Astrophys. J. 250, 327 CrossRefGoogle Scholar
Vogt, S.S.: 1983, This volume.Google Scholar