Possible chromospheric activity cycles in AD Leo

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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, A.P., Petrucci, R., Jofré, E., Mauas, P.J.D.
Formato:	JOUR
Materias:	stars: activity stars: flare stars: low-mass
Acceso en línea:	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	todo:paper_20418205_v781_n1_p_Buccino
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spelling	todo:paper_20418205_v781_n1_p_Buccino2023-10-03T16:38:03Z Possible chromospheric activity cycles in AD Leo Buccino, A.P. Petrucci, R. Jofré, E. Mauas, P.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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, A.P. Petrucci, R. Jofré, E. Mauas, P.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..
format	JOUR
author	Buccino, A.P. Petrucci, R. Jofré, E. Mauas, P.J.D.
author_facet	Buccino, A.P. Petrucci, R. Jofré, E. Mauas, P.J.D.
author_sort	Buccino, A.P.
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
url	http://hdl.handle.net/20.500.12110/paper_20418205_v781_n1_p_Buccino
work_keys_str_mv	AT buccinoap possiblechromosphericactivitycyclesinadleo AT petruccir possiblechromosphericactivitycyclesinadleo AT jofree possiblechromosphericactivitycyclesinadleo AT mauaspjd possiblechromosphericactivitycyclesinadleo
_version_	1782025372843376640

Possible chromospheric activity cycles in AD Leo

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