Starspot cycles from long-term photometry

K. Oláh, K. G. Strassmeier

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We continue investigating the photometric cycle lengths of some active stars. Using datasets now up to 34 years long we confirm previously derived activity cycles for the shorter period systems of our sample (LQ Hya, V833 Tau, EI Eri, V711 Tau, HU Vir and IL Hya), but find different cycle lengths for the two long-period giants HK Lac and IM Peg. We add UZ Lib to our previous sample. The connection between the rotational period and cycle length seems evident for the shortest derived cycle lengths. A similar connection between the rotational period and the longer cycle lengths is not as clear, taking into account recent results on the time variability of the longer term solar cycles. While the time base of the observations puts an upper limit to the detectable lengths of the longer cycles, a general dependence of the cycle period on the rotation rate is maintained. The length of the shortest cycle that we found for LQ Hya agrees with the cycle period derived from dynamo modelling of this star.

Original languageEnglish
Pages (from-to)361-366
Number of pages6
JournalAstronomische Nachrichten
Volume323
Issue number3-4
DOIs
Publication statusPublished - 2002

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starspots
photometry
cycles
solar cycle
modeling
stars
solar cycles
rate

Keywords

  • Stars: activity
  • Stars: cycles
  • Stars: spots

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Starspot cycles from long-term photometry. / Oláh, K.; Strassmeier, K. G.

In: Astronomische Nachrichten, Vol. 323, No. 3-4, 2002, p. 361-366.

Research output: Contribution to journalArticle

Oláh, K. ; Strassmeier, K. G. / Starspot cycles from long-term photometry. In: Astronomische Nachrichten. 2002 ; Vol. 323, No. 3-4. pp. 361-366.
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