Publication: Effect of magnetic activity saturation in chromospheric flux-flux relationships
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2011-07
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Wiley
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Abstract
We present a homogeneous study of chromospheric and coronal flux–flux relationships using a sample of 298 late-type dwarf active stars with spectral types F to M. The chromospheric lines were observed simultaneously in each star to avoid spread as a result of long-term variability. Unlike other works, we subtract the basal chromospheric contribution in all the spectral lines studied. For the first time, we quantify the departure of dMe stars from the general relations. We show that dK and dKe stars also deviate from the general trend. Studying the flux–colour diagrams, we demonstrate that the stars deviating from the general relations are those with saturated X-ray emission and we show that these stars also present saturation in the Hα line. Using several age spectral indicators, we show that these are younger stars than those following the general relationships. The non-universality of flux–flux relationships found in this work should be taken into account when converting between fluxes in different chromospheric activity indicators.
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© 2011 The Authors Monthly Notices of the Royal Astronomical Society.
© 2011 RAS.
The authors acknowledge support from the Spanish Ministerio de Educación y Ciencia (currently the Ministerio de Ciencia e Innovación), under the grant FPI20061465-00592 (Programa Nacional Formación Personal Investigador) and projects AYA2008-00695 (Programa Nacional de Astronomía y Astrofísica), AstroMadrid S2009/ESP-1496. JL-S acknowledges support by the Spanish Ministerio de Ciencia e Innovación under grant AYA2008-06423-C03-03. This research has made use of the SIMBAD data base and the VizieR catalogue access tool, operated at CDS, Strasbourg, France.
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