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Context. The main chromospheric activity indicator is the S index, which is the ratio of the flux in the core of the Ca II H and K lines to the continuum nearby, and is well studied for stars from F to K. Another chromospheric proxy is the Ha line, which is believed to be tightly correlated with the Ca II index. Aims. In this work we characterize both chromospheric activity indicators, the one associated with the H and K Ca II lines and the other with Ha, for the whole range of late type stars, from F to M. Methods. 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. Results. We directly derive the conversion factor that translates the known S index to flux in the Ca II cores, and extend its calibration to a wider spectral range. We investigate the relation between the activity measurements in the calcium and hydrogen lines, and found that the usual correlation observed is the product of the dependence of each flux on stellar colour, and not the product of similar activity phenomena. © ESO 2007.


Documento: Artículo
Título:Hα and the Ca II H and K lines as activity proxies for late-type stars
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: late-type; Activity proxies; Spectral range; Stellar color; Calcium; Chromosomes; Continuum mechanics; Correlation methods; Hydrogen; Magnetic flux; Spacecraft observatories; Stars
Página de inicio:309
Página de fin:317
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.


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---------- APA ----------
Cincunegui, C., Díaz, R.F. & Mauas, P.J.D. (2007) . Hα and the Ca II H and K lines as activity proxies for late-type stars. Astronomy and Astrophysics, 469(1), 309-317.
---------- CHICAGO ----------
Cincunegui, C., Díaz, R.F., Mauas, P.J.D. "Hα and the Ca II H and K lines as activity proxies for late-type stars" . Astronomy and Astrophysics 469, no. 1 (2007) : 309-317.
---------- MLA ----------
Cincunegui, C., Díaz, R.F., Mauas, P.J.D. "Hα and the Ca II H and K lines as activity proxies for late-type stars" . Astronomy and Astrophysics, vol. 469, no. 1, 2007, pp. 309-317.
---------- VANCOUVER ----------
Cincunegui, C., Díaz, R.F., Mauas, P.J.D. Hα and the Ca II H and K lines as activity proxies for late-type stars. Astron. Astrophys. 2007;469(1):309-317.