Abstract
The light curve (LC) of the single-line spectroscopic binary system II Peg (K2–3, IV-IIl) 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 (l98l). 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).
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La Fauci, G., Rodonò, M. (1983). Two-Spot Modeling of Synoptic Light Curves of II Peg. In: Byrne, P.B., Rodonò, M. (eds) Activity in Red-Dwarf Stars. Astrophysics and Space Science Library, vol 102. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7157-8_20
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