Possible chromospheric activity cycles in AD Leo

AD Leo (GJ 388) is an active dM3 flare star that has been extensively observed both in the quiescent and flaring states. Since this active star is near the fully convective boundary, studying its long-term chromospheric activity in detail could be an appreciable contribution to dynamo theory. Here,...

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Autores principales: Buccino, Andrea Paola, Petrucci, Romina Paola, Mauas, Pablo J.D.
Publicado: 2014
Materias:
stars: activity
stars: flare
stars: low-mass
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20418205_v781_n1_p_Buccino
http://hdl.handle.net/20.500.12110/paper_20418205_v781_n1_p_Buccino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_20418205_v781_n1_p_Buccino
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spelling paper:paper_20418205_v781_n1_p_Buccino2025-07-30T19:08:54Z Possible chromospheric activity cycles in AD Leo Buccino, Andrea Paola Petrucci, Romina Paola Mauas, Pablo J.D. stars: activity stars: flare stars: low-mass AD Leo (GJ 388) is an active dM3 flare star that has been extensively observed both in the quiescent and flaring states. Since this active star is near the fully convective boundary, studying its long-term chromospheric activity in detail could be an appreciable contribution to dynamo theory. Here, using the Lomb-Scargle periodogram, we analyze the Ca II K line-core fluxes derived from CASLEO spectra obtained between 2001 and 2013 and the V magnitude from the ASAS database between 2004 and 2010. From both of these totally independent time series, we obtain a possible activity cycle with a period of approximately seven years and a less significant shorter cycle of approximately two years. A tentative interpretation is that a dynamo operating near the surface could be generating the longer cycle, while a second dynamo operating in the deep convection zone could be responsible for the shorter one. Based on the long duration of our observing program at CASLEO and the fact that we observe different spectral features simultaneously, we also analyze the relation between simultaneous measurements of the Na I index (), Hα, and Ca II K fluxes at different activity levels of AD Leo, including flares. © 2014. The American Astronomical Society. All rights reserved.. Fil:Buccino, A.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Petrucci, R. 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. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20418205_v781_n1_p_Buccino http://hdl.handle.net/20.500.12110/paper_20418205_v781_n1_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 stars: activity
stars: flare
stars: low-mass
spellingShingle stars: activity
stars: flare
stars: low-mass
Buccino, Andrea Paola
Petrucci, Romina Paola
Mauas, Pablo J.D.
Possible chromospheric activity cycles in AD Leo
topic_facet stars: activity
stars: flare
stars: low-mass
description AD Leo (GJ 388) is an active dM3 flare star that has been extensively observed both in the quiescent and flaring states. Since this active star is near the fully convective boundary, studying its long-term chromospheric activity in detail could be an appreciable contribution to dynamo theory. Here, using the Lomb-Scargle periodogram, we analyze the Ca II K line-core fluxes derived from CASLEO spectra obtained between 2001 and 2013 and the V magnitude from the ASAS database between 2004 and 2010. From both of these totally independent time series, we obtain a possible activity cycle with a period of approximately seven years and a less significant shorter cycle of approximately two years. A tentative interpretation is that a dynamo operating near the surface could be generating the longer cycle, while a second dynamo operating in the deep convection zone could be responsible for the shorter one. Based on the long duration of our observing program at CASLEO and the fact that we observe different spectral features simultaneously, we also analyze the relation between simultaneous measurements of the Na I index (), Hα, and Ca II K fluxes at different activity levels of AD Leo, including flares. © 2014. The American Astronomical Society. All rights reserved..
author Buccino, Andrea Paola
Petrucci, Romina Paola
Mauas, Pablo J.D.
author_facet Buccino, Andrea Paola
Petrucci, Romina Paola
Mauas, Pablo J.D.
author_sort Buccino, Andrea Paola
title Possible chromospheric activity cycles in AD Leo
title_short Possible chromospheric activity cycles in AD Leo
title_full Possible chromospheric activity cycles in AD Leo
title_fullStr Possible chromospheric activity cycles in AD Leo
title_full_unstemmed Possible chromospheric activity cycles in AD Leo
title_sort possible chromospheric activity cycles in ad leo
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20418205_v781_n1_p_Buccino
http://hdl.handle.net/20.500.12110/paper_20418205_v781_n1_p_Buccino
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AT petruccirominapaola possiblechromosphericactivitycyclesinadleo
AT mauaspablojd possiblechromosphericactivitycyclesinadleo
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