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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 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.

Registro:

Documento: Artículo
Título:Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A
Autor:Buccino, A.P.; Díaz, R.F.; Luoni, M.L.; Abrevaya, X.C.; Mauas, P.J.D.
Filiación:Instituto de Astronomía y Física del Espacio (CONICET), C.C. 67 Sucursal 28, C1428EHA-Buenos Aires, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Institut D'Astrophysique de Paris, 98bis, blvd Arago, F-75014 Paris, France
Palabras clave:Activity - stars; Late-type - techniques; Photometric - techniques; Spectroscopic; Stars
Año:2011
Volumen:141
Número:2
DOI: http://dx.doi.org/10.1088/0004-6256/141/2/34.
Título revista:Astronomical Journal
Título revista abreviado:Astron. J.
ISSN:00046256
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046256_v141_n2_p_Buccino

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Citas:

---------- APA ----------
Buccino, A.P., Díaz, R.F., Luoni, M.L., Abrevaya, X.C. & Mauas, P.J.D. (2011) . Long-term chromospheric activity in southern m dwarfs: Gl 229 A and Gl 752 A. Astronomical Journal, 141(2).
http://dx.doi.org/10.1088/0004-6256/141/2/34.
---------- CHICAGO ----------
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" . Astronomical Journal 141, no. 2 (2011).
http://dx.doi.org/10.1088/0004-6256/141/2/34.
---------- MLA ----------
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" . Astronomical Journal, vol. 141, no. 2, 2011.
http://dx.doi.org/10.1088/0004-6256/141/2/34.
---------- VANCOUVER ----------
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. Astron. J. 2011;141(2).
http://dx.doi.org/10.1088/0004-6256/141/2/34.