Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A

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 variab...

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Autores principales: Buccino, A.P., Díaz, R.F., Luoni, M.L., Abrevaya, X.C., Mauas, P.J.D.
Formato: JOUR
Materias:
Activity - stars
Late-type - techniques
Photometric - techniques
Spectroscopic
Stars
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046256_v141_n2_p_Buccino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00046256_v141_n2_p_Buccino
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spelling todo:paper_00046256_v141_n2_p_Buccino2023-10-03T13:59:42Z Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A Buccino, A.P. Díaz, R.F. Luoni, M.L. Abrevaya, X.C. Mauas, P.J.D. Activity - stars Late-type - techniques Photometric - techniques Spectroscopic Stars 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 twoMdwarf 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. © 2011. The American Astronomical Society. Fil:Buccino, A.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Díaz, R.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Luoni, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Abrevaya, X.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mauas, P.J.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046256_v141_n2_p_Buccino
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Activity - stars
Late-type - techniques
Photometric - techniques
Spectroscopic
Stars
spellingShingle Activity - stars
Late-type - techniques
Photometric - techniques
Spectroscopic
Stars
Buccino, A.P.
Díaz, R.F.
Luoni, M.L.
Abrevaya, X.C.
Mauas, P.J.D.
Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A
topic_facet Activity - stars
Late-type - techniques
Photometric - techniques
Spectroscopic
Stars
description 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 twoMdwarf 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. © 2011. The American Astronomical Society.
format JOUR
author Buccino, A.P.
Díaz, R.F.
Luoni, M.L.
Abrevaya, X.C.
Mauas, P.J.D.
author_facet Buccino, A.P.
Díaz, R.F.
Luoni, M.L.
Abrevaya, X.C.
Mauas, P.J.D.
author_sort Buccino, A.P.
title Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A
title_short Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A
title_full Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A
title_fullStr Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A
title_full_unstemmed Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A
title_sort long-term chromospheric activity in southern m dwarfs: gl 229 a and gl 752 a
url http://hdl.handle.net/20.500.12110/paper_00046256_v141_n2_p_Buccino
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AT luoniml longtermchromosphericactivityinsouthernmdwarfsgl229aandgl752a
AT abrevayaxc longtermchromosphericactivityinsouthernmdwarfsgl229aandgl752a
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