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Activity cycle in the RS CVn system II Peg

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Active Close Binaries

Part of the book series: NATO ASI Series ((ASIC,volume 319))

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Abstract

We have analyzed visible light curves of II Peg (HD 224085), covering in time from 1974 to 1989, with a two spots simulating program.

The 1989 light curve shows an exceptional concentration and size of the spots, with the highest amplitude ever known, and reaching at the maximum a magnitude near the brightest state historically measured.

Based on the photometric light curves, we suggest the existence of differential rotation on the star, a magnetic cycle of about 14 years and the existence of two longitudinal active bands (around 90° and 270°), where the spots appear preferentially.

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Author information

Authors and Affiliations

  1. Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain

    C. Lázaro

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  1. C. Lázaro
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Editors and Affiliations

  1. Astronomy and Space Sciences Department, Ege University Science Faculty, Bornova, Izmir, Turkey

    Cafer İbanoğlu

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© 1990 Kluwer Academic Publishers

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Lázaro, C. (1990). Activity cycle in the RS CVn system II Peg. In: İbanoğlu, C. (eds) Active Close Binaries. NATO ASI Series, vol 319. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0679-2_43

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  • DOI: https://doi.org/10.1007/978-94-009-0679-2_43

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-6790-4

  • Online ISBN: 978-94-009-0679-2

  • eBook Packages: Springer Book Archive

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