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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz

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Volume 21, Issue 4


A New Approach to the Long-Term Activity Behavior of DM UMa

G. Taş
  • Corresponding author
  • Ege University, Science Faculty, Department of Astronomy and Space Sciences, 35100 Bomova-Izmir, Turkey
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ S. Evren
Published Online: 2017-03-23 | DOI: https://doi.org/10.1515/astro-2017-0401


A long-term activity character of DM UMa (K0-1 IV-III), which is one of the most active members of the RS CVn type variables, is examined using the multicolor photometric observations which spread to the time interval between 1980 and 2009. In this work, we present a new approximation for the long-term light and color variation of DM UMa using data obtained by combining our own observations obtained in the Johnson broad-band U,B,V,R filters between the years 1997 and 2008 and data published in literature. Available light and color data were examined for the long-term and seasonal variations using PERIOD04 program. The period analysis of the V-band data reveals the period estimations of 51.2±2.8 years and 15.1±0.7 years superposed on it. The U-B, B-V and V-R colors do not show correlation with the longer period, but they show variations with a period similar to the shorter one, except for B-V color. The amplitude variation also does not exhibit any correlation with the V light and color curves. It is found that the movement of the spot minima phases in years also indicates the migration period of nearly 15 years, similar to the period derived from the analysis of the long-term photometric observations in V-band.

Keywords: techniques; photometric; stars; late; type; stars; activity; starspots; stars; individual; DM UMa


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About the article

Received: 2012-09-25

Revised: 2012-11-08

Accepted: 2012-11-15

Published Online: 2017-03-23

Published in Print: 2012-12-01

Citation Information: Open Astronomy, Volume 21, Issue 4, Pages 435–446, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0401.

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© 2017. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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