Activity time series of old stars from late F to early K - III. Diagnosis from photometry

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Table 1

Long-term amplitude ΔI for pole-on and edge-on configurations.

	ΔTspot₁	ΔTspot₂
Dominant feature	ΔI₀ > 0	ΔI₉₀ < 0
	99%	97%

Case ΔI₀,ΔI₉₀ same sign	All > 0	All < 0
Fraction	90%	18%
Median ΔI₀/ΔI₉₀	1.82	0.97
Range ΔI₀/ΔI₉₀	[1.35;2.56]	[0.40;2.18]

Case ΔI₀,ΔI₉₀ opposite sign	ΔI₀ > 0	ΔI₀ > 0
	ΔI₉₀ < 0	ΔI₉₀ < 0
Fraction	10%	78%
Median ΔI₀/ΔI₉₀	−1.42	−1.23
Range ΔI₀/ΔI₉₀	[−2.83;−0.64]	[−2.64;−0.44]

Notes. Percentages are given with respect to the total sample. The ranges correspond to the fifth and the ninth percentiles over all ΔI₀ and ΔI₉₀ values.

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