Long-term Chromospheric Activity in Southern M Dwarfs: Gl 229 a and Gl 752 A - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2011

Long-term Chromospheric Activity in Southern M Dwarfs: Gl 229 a and Gl 752 A

Andrea P. Buccino
  • Function : Author
María Luisa Luoni
  • Function : Author
Ximena C. Abrevaya
  • Function : Author
Pablo J. D. Mauas
  • Function : Author

Abstract

Several late-type stars present activity cycles similar to that of the Sun. However, these cycles have been mostly studied in F to K stars. Due to their small intrinsic brightness, M dwarfs are not usually the targets of long-term observational studies of stellar activity, and their long-term variability is generally not known. In this work, we study the long-term activity of two M dwarf stars: Gl 229 A (M1/2) and Gl 752 A (M2.5). We employ medium-resolution echelle spectra obtained at the 2.15 m telescope at the Argentinian observatory CASLEO between 2000 and 2010, and photometric observations obtained from the ASAS database. We analyze Ca II K line-core fluxes and the mean V magnitude with the Lomb-Scargle periodogram, and we obtain possible activity cycles of ~4 yr for Gl 229 A and ~7 yr for Gl 752 A.

Dates and versions

insu-03646073 , version 1 (19-04-2022)

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Andrea P. Buccino, Rodrigo F. Díaz, María Luisa Luoni, Ximena C. Abrevaya, Pablo J. D. Mauas. Long-term Chromospheric Activity in Southern M Dwarfs: Gl 229 a and Gl 752 A. The Astronomical Journal, 2011, 141, ⟨10.1088/0004-6256/141/2/34⟩. ⟨insu-03646073⟩
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