Modulated stellar and solar cycles: Parallels and differences

K. Oláh, L. Van Driel-Gesztelyi, K. G. Strassmeier

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We present examples of activity cycle timescales on different types of stars from lowmass dwarfs to more massive giants, with wide-ranging rotation rates, and compare the observed cyclicities to the irradiance based solar cycle and its modulations. Using annual spectral solar irradiance in wavelength bands typical for stellar observations reconstructed by Shapiro et al. (2011), a direct comparison can be made between cycle timescales and amplitudes derived for the Sun and the stars. We show that cycles on multiple timescales, known to be present in solar activity, also show up on stars when the dataset is long enough to allow recognition. The cycle lengths are not fixed, but evolve - gradually during some periods but there are also changes on short timescales. In case the activity is dominated by spots, i.e., by cooler surface features, the star is redder when fainter, whereas other type of activity make the stars bluer when the activity is higher. We found the Sun to be a member of the former group, based on reconstructed spectral irradiance data by Shapiro et al. (2011).

Original languageEnglish
Title of host publicationProceedings of the International Astronomical Union
Pages279-285
Number of pages7
Volume7
EditionS286
DOIs
Publication statusPublished - Oct 2011

Publication series

NameProceedings of the International Astronomical Union
NumberS286
Volume7
ISSN (Print)17439213
ISSN (Electronic)17439221

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solar cycles
irradiance
stars
cycles
sun
blue stars
solar activity
coolers
modulation
wavelengths

Keywords

  • stars: activity
  • stars: spots
  • Sun: activity
  • sunspots

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Oláh, K., Van Driel-Gesztelyi, L., & Strassmeier, K. G. (2011). Modulated stellar and solar cycles: Parallels and differences. In Proceedings of the International Astronomical Union (S286 ed., Vol. 7, pp. 279-285). (Proceedings of the International Astronomical Union; Vol. 7, No. S286). https://doi.org/10.1017/S1743921312004978

Modulated stellar and solar cycles : Parallels and differences. / Oláh, K.; Van Driel-Gesztelyi, L.; Strassmeier, K. G.

Proceedings of the International Astronomical Union. Vol. 7 S286. ed. 2011. p. 279-285 (Proceedings of the International Astronomical Union; Vol. 7, No. S286).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oláh, K, Van Driel-Gesztelyi, L & Strassmeier, KG 2011, Modulated stellar and solar cycles: Parallels and differences. in Proceedings of the International Astronomical Union. S286 edn, vol. 7, Proceedings of the International Astronomical Union, no. S286, vol. 7, pp. 279-285. https://doi.org/10.1017/S1743921312004978
Oláh K, Van Driel-Gesztelyi L, Strassmeier KG. Modulated stellar and solar cycles: Parallels and differences. In Proceedings of the International Astronomical Union. S286 ed. Vol. 7. 2011. p. 279-285. (Proceedings of the International Astronomical Union; S286). https://doi.org/10.1017/S1743921312004978
Oláh, K. ; Van Driel-Gesztelyi, L. ; Strassmeier, K. G. / Modulated stellar and solar cycles : Parallels and differences. Proceedings of the International Astronomical Union. Vol. 7 S286. ed. 2011. pp. 279-285 (Proceedings of the International Astronomical Union; S286).
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