Photospheric and chromospheric activity in V405 Andromedae

K. Vida, K. Oláh, Z. Kővári, H. Korhonen, J. Bartus, Z. Hurta, K. Posztobányi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We investigate the fast-rotating (Porb = Prot = 0.465d), active dwarf binary V405 And (M0V+M5V) using photometric BV(RI)C and optical spectroscopic data. The light variation is caused by the combined effect of spottedness and binarity with a small eclipse. We estimate the system parameters from the available light and radial velocity curves. Three flare events occurred during the observations: two were found in the spectroscopic data and one was observed photometrically in BV(RI)C colours. An interesting eruptive phenomenon emerged from the photometric measurements that can be interpreted as a series of post-flare eruptions lasting for at least 3 orbits (rotations) of the system, originating from trans-equatorial magnetic loops, which connect the active regions in the two hemispheres. The two components of V405 And have masses well over and below the theoretical limit of full convection. This rare property makes the binary an ideal target for observing and testing models for stellar dynamo action.

Original languageEnglish
Pages (from-to)1021-1029
Number of pages9
JournalAstronomy and Astrophysics
Volume504
Issue number3
DOIs
Publication statusPublished - Sep 4 2009

Fingerprint

flares
eclipses
hemispheres
radial velocity
volcanic eruptions
convection
volcanic eruption
orbits
color
curves
estimates
effect
parameter

Keywords

  • Binaries: eclipsing
  • Stars: activity
  • Stars: chromospheres
  • Stars: fundamental parameters
  • Stars: individual: V405 Andromedae
  • Starspots

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Photospheric and chromospheric activity in V405 Andromedae. / Vida, K.; Oláh, K.; Kővári, Z.; Korhonen, H.; Bartus, J.; Hurta, Z.; Posztobányi, K.

In: Astronomy and Astrophysics, Vol. 504, No. 3, 04.09.2009, p. 1021-1029.

Research output: Contribution to journalArticle

Vida, K. ; Oláh, K. ; Kővári, Z. ; Korhonen, H. ; Bartus, J. ; Hurta, Z. ; Posztobányi, K. / Photospheric and chromospheric activity in V405 Andromedae. In: Astronomy and Astrophysics. 2009 ; Vol. 504, No. 3. pp. 1021-1029.
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AU - Bartus, J.

AU - Hurta, Z.

AU - Posztobányi, K.

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KW - Starspots

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