Chromospheric activity in Proxima Centauri
Carolina Cecilia Cincunegui (Instituto de Astronomia y Fisica del Espacio, Buenos Aires, Argentina)
Pablo J. D. Mauas (Instituto de Astronomia y Fisica del Espacio, Buenos Aires, Argentina)
We present Echelle spectra of the dM5.5e star Proxima
Centauri, obtained with the 2.15 m telescope of the CASLEO
Observatory located in the Argentinean Andes. Our spectra
range from 3900 to 6700 Åat a spectral resolution of
R≈ 26400 and are flux-calibrated.
We have observations from 1999, taken in 10 different
observing runs. We find very strong variability, even
between spectra taken on the same night. This fact allows
us to estimate the frequency of occurrence of flares.
We study several activity indicators, including the Ca II
and Hα lines, the Na I D doublet and the He I D3
line.
http://www.iafe.uba.ar/cincunegui