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Figure 1:
Upper panel:
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Figure 2:
CE (measured by Log R'![]() |
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Figure 3:
Comparison between the CE index, Log R'![]() |
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Figure 4:
Transverse velocity dispersion S vs. dereddened B-V. Solar neighborhood
stars and EH stars are represented by squares and filled circles, respectively.
Error bars are derived as
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Figure 5: Upper panels: chromospheric age distributions derived from the D93 and RPM98 calibrations. The lower panel correspond to the isochrone distribution. Vertical continuous lines show the medians of each histogram. In the isochrone age distribution we superpose with continuous and dotted lines upper and lower limits estimations from Nördstrom et al. (2004). |
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Figure 6: Chromospheric ages against isochrone and lithium ages, and [Fe/H] upper limits, respectively. |
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Figure 7: Isochrone and chromospheric age distributions for the Solar Neighborhood stars. Isochrone ages for samples A and B were taken from Nördstrom et al. (2004). Chromospheric ages for sample C from Henry et al. (1996) and Strassmeier et al. (2000). Spectral types G and F in samples B and C are indicated by dashed and empty histograms, respectively. The vertical continuous lines show the median positions of each histogram. The thicker lines correspond to the F type and the lighter to the G type. |
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Figure 8: Chromospheric ages vs isochrone ages for F and G-type solar neighborhood stars. Filled and empty circles correspond to F and G spectral types, respectively. Isochrone ages are taken from Nördstrom et al. (2004) and chromospheric determinations from Henry et al. (1996) and Strassmeier et al. (2000). |
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Figure 9: Chromospheric and isochrone age distributions of EH stars. Spectral types G and F are indicated by dashed and empty histograms, respectively. The vertical continuous lines show the median positions of each histogram. The thicker lines correspond to the F type and the lighter to the G type. |
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Figure 10: Isochrone age distributions for EH stars (shade histograms) and sample B (empty histograms). The right panel corresponds to stars of spectral type F in both samples and the left panel to G-type objects. The vertical continuous lines show the median positions of each histogram. The thicker lines correspond to the F type and the lighter to the G type. |
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Figure 11:
Upper panels:
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