/ftp/cats/J_A+A/469/./309



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J/A+A/469/309    Chromospheric activity in late-type stars   (Cincunegui+, 2007)
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	table2.dat
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Beginning of ReadMe : J/A+A/469/309 Chromospheric activity in late-type stars (Cincunegui+, 2007) ================================================================================ Halpha and the CaII H and K lines as activity proxies for late-type stars. Cincunegui C., Diaz R.F., Mauas P.J.D. <Astron. Astrophys., 469, 309-317 (2007)> =2007A&A...469..309C ================================================================================ ADC_Keywords: Stars, late-type ; Spectroscopy Keywords: stars: late-type - stars: activity - stars: chromospheres Abstract: The main chromospheric activity indicator is the S index, which is the ratio of the flux in the core of the CaII H and K lines to the continuum nearby, and is well studied for stars from F to K. Another chromospheric proxy is the Halpha line, which is believed to be tightly correlated with the CaII index. In this work we characterize both chromospheric activity indicators, the one associated with the H and K CaII lines and the other with Halpha, for the whole range of late type stars, from F to M. Description: We present periodic medium-resolution echelle observations covering the complete visual range, taken at the CASLEO Argentinean Observatory over 7 years. We use a total of 917 flux-calibrated spectra for 109 stars that range from F6 to M5. We statistically study these two indicators for stars of different activity levels and spectral types.