SIMBAD references

2011AJ....141...34B - Astron. J., 141, 34 (2011/February-0)

Long-term chromospheric activity in southern M dwarfs: gl 229 a and gl 752 a.

BUCCINO A.P., DIAZ R.F., LUONI M.L., ABREVAYA X.C. and MAUAS P.J.D.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: late-type - techniques: photometric - techniques: spectroscopic

Simbad objects: 10

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2019.10.18-17:10:33

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