A possible activity cycle in Proxima Centauri

Context. Several late-type stars present activity cycles resembling the Solar one. This fact has been observed mostly in stars ranging from F to K, i.e., in stars with a radiative core and an outer convective layer. Aims. This work aims at studying whether an activity cycle can be detected in the dM...

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Detalles Bibliográficos
Publicado:	2007
Materias:	Stars: activity Stars: chromospheres Stars: flare Stars: individual: Proxima Centauri Optical resolving power Spectrum analysis Statistical methods Sun
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v461_n3_p1107_Cincunegui http://hdl.handle.net/20.500.12110/paper_00046361_v461_n3_p1107_Cincunegui
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00046361_v461_n3_p1107_Cincunegui
record_format	dspace
spelling	paper:paper_00046361_v461_n3_p1107_Cincunegui2023-06-08T14:27:43Z A possible activity cycle in Proxima Centauri Stars: activity Stars: chromospheres Stars: flare Stars: individual: Proxima Centauri Stars: activity Stars: chromospheres Stars: flare Stars: individual: Proxima Centauri Optical resolving power Spectrum analysis Statistical methods Sun Context. Several late-type stars present activity cycles resembling the Solar one. This fact has been observed mostly in stars ranging from F to K, i.e., in stars with a radiative core and an outer convective layer. Aims. This work aims at studying whether an activity cycle can be detected in the dM5.5e star Proxima Centauri, which is supposed to be completely convective. Methods. We present periodical medium-resolution echelle observations covering the complete visual range, which were taken at the CASLEO Argentinean Observatory. These observations are distributed over 7 years. We discarded the spectra that present flare activity, and analyze the remaining activity levels using four different statistical techniques to look for a period of activity. Results. We find strong evidence of a cyclic activity, with a period of ∼442 days. We also estimate that the Ca II S index varies around 130% due to activity variations outside of flares. © ESO 2007. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v461_n3_p1107_Cincunegui http://hdl.handle.net/20.500.12110/paper_00046361_v461_n3_p1107_Cincunegui
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: chromospheres Stars: flare Stars: individual: Proxima Centauri Stars: activity Stars: chromospheres Stars: flare Stars: individual: Proxima Centauri Optical resolving power Spectrum analysis Statistical methods Sun
spellingShingle	Stars: activity Stars: chromospheres Stars: flare Stars: individual: Proxima Centauri Stars: activity Stars: chromospheres Stars: flare Stars: individual: Proxima Centauri Optical resolving power Spectrum analysis Statistical methods Sun A possible activity cycle in Proxima Centauri
topic_facet	Stars: activity Stars: chromospheres Stars: flare Stars: individual: Proxima Centauri Stars: activity Stars: chromospheres Stars: flare Stars: individual: Proxima Centauri Optical resolving power Spectrum analysis Statistical methods Sun
description	Context. Several late-type stars present activity cycles resembling the Solar one. This fact has been observed mostly in stars ranging from F to K, i.e., in stars with a radiative core and an outer convective layer. Aims. This work aims at studying whether an activity cycle can be detected in the dM5.5e star Proxima Centauri, which is supposed to be completely convective. Methods. We present periodical medium-resolution echelle observations covering the complete visual range, which were taken at the CASLEO Argentinean Observatory. These observations are distributed over 7 years. We discarded the spectra that present flare activity, and analyze the remaining activity levels using four different statistical techniques to look for a period of activity. Results. We find strong evidence of a cyclic activity, with a period of ∼442 days. We also estimate that the Ca II S index varies around 130% due to activity variations outside of flares. © ESO 2007.
title	A possible activity cycle in Proxima Centauri
title_short	A possible activity cycle in Proxima Centauri
title_full	A possible activity cycle in Proxima Centauri
title_fullStr	A possible activity cycle in Proxima Centauri
title_full_unstemmed	A possible activity cycle in Proxima Centauri
title_sort	possible activity cycle in proxima centauri
publishDate	2007
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v461_n3_p1107_Cincunegui http://hdl.handle.net/20.500.12110/paper_00046361_v461_n3_p1107_Cincunegui
_version_	1768543014552076288

A possible activity cycle in Proxima Centauri

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