Surface evolution in stable magnetic fields: The case of the fully convective dwarf V374 Peg

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Abstract

We present BV (RI)C photometric measurements of the dM4-type V374 Peg covering ∼ 430 days. The star has a mass of ∼ 0.28MSun, so it is supposed to be fully convective. Previous observations detected almost-rigid-body rotation and stable, axisymmetric poloidal magnetic field. Our photometric data agree well with this picture, one persistent active nest is found on the stellar surface. Nevertheless, the surface is not static: night-to-night variations and frequent flaring are observed. The flares seem to be concentrated on the brighter part of the surface. The short-time changes of the light curve could indicate emerging flux ropes in the same region, resembling to the active nests on the Sun. We have observed flaring and quiet states of V374 Peg changing on monthly timescale.

Original languageEnglish
Title of host publicationThe Physics of Sun and Star Spots
EditorsDebi Prasad Choudhary, Klaus Strassmeier
Pages460-464
Number of pages5
EditionS273
DOIs
Publication statusPublished - Aug 1 2010

Publication series

NameProceedings of the International Astronomical Union
NumberS273
Volume6
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

Keywords

  • Magnetic fields
  • Stars: activity
  • Stars: flare
  • Stars: individual (V374 Peg)
  • Stars: late-type
  • Stars: magnetic fields
  • Stars: spots
  • Techniques: photometric

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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  • Cite this

    Vida, K., Oláh, K., & Kovári, Z. (2010). Surface evolution in stable magnetic fields: The case of the fully convective dwarf V374 Peg. In D. P. Choudhary, & K. Strassmeier (Eds.), The Physics of Sun and Star Spots (S273 ed., pp. 460-464). (Proceedings of the International Astronomical Union; Vol. 6, No. S273). https://doi.org/10.1017/S1743921311015778