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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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046256_v141_n2_p_Buccino http://hdl.handle.net/20.500.12110/paper_00046256_v141_n2_p_Buccino |
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paper:paper_00046256_v141_n2_p_Buccino2023-06-08T14:27:14Z Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A Buccino, Andrea Paola Díaz, Rodrigo Fernando Luoni, Maria Luisa Abrevaya, Ximena Celeste Mauas, Pablo 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. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046256_v141_n2_p_Buccino 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, Andrea Paola Díaz, Rodrigo Fernando Luoni, Maria Luisa Abrevaya, Ximena Celeste Mauas, Pablo 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. |
author |
Buccino, Andrea Paola Díaz, Rodrigo Fernando Luoni, Maria Luisa Abrevaya, Ximena Celeste Mauas, Pablo J.D. |
author_facet |
Buccino, Andrea Paola Díaz, Rodrigo Fernando Luoni, Maria Luisa Abrevaya, Ximena Celeste Mauas, Pablo J.D. |
author_sort |
Buccino, Andrea Paola |
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 |
publishDate |
2011 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046256_v141_n2_p_Buccino http://hdl.handle.net/20.500.12110/paper_00046256_v141_n2_p_Buccino |
work_keys_str_mv |
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1768544252213592064 |