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Abstract:

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.

Registro:

Documento: Artículo
Título:A possible activity cycle in Proxima Centauri
Autor:Cincunegui, C.; Díaz, R.F.; Mauas, P.J.D.
Filiación:Instituto de Astronomía y Física del Espacio, CONICET-UBA, C.C. 67 Suc. 28, (1428) Buenos Aires, Argentina
CONICET, Argentina
Carrera del Investigador Científico, CONICET, Argentina
Palabras clave: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
Año:2007
Volumen:461
Número:3
Página de inicio:1107
Página de fin:1113
DOI: http://dx.doi.org/10.1051/0004-6361:20066027
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v461_n3_p1107_Cincunegui

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Citas:

---------- APA ----------
Cincunegui, C., Díaz, R.F. & Mauas, P.J.D. (2007) . A possible activity cycle in Proxima Centauri. Astronomy and Astrophysics, 461(3), 1107-1113.
http://dx.doi.org/10.1051/0004-6361:20066027
---------- CHICAGO ----------
Cincunegui, C., Díaz, R.F., Mauas, P.J.D. "A possible activity cycle in Proxima Centauri" . Astronomy and Astrophysics 461, no. 3 (2007) : 1107-1113.
http://dx.doi.org/10.1051/0004-6361:20066027
---------- MLA ----------
Cincunegui, C., Díaz, R.F., Mauas, P.J.D. "A possible activity cycle in Proxima Centauri" . Astronomy and Astrophysics, vol. 461, no. 3, 2007, pp. 1107-1113.
http://dx.doi.org/10.1051/0004-6361:20066027
---------- VANCOUVER ----------
Cincunegui, C., Díaz, R.F., Mauas, P.J.D. A possible activity cycle in Proxima Centauri. Astron. Astrophys. 2007;461(3):1107-1113.
http://dx.doi.org/10.1051/0004-6361:20066027