A multi-wavelength view of the multiple activity cycles of ϵ Eridani

Open Access

Table 6

Best-fit parameters obtained by fitting the S_MWO and S_{Ca IRT} data with sine curves (A • sin(2 • π/P • time + ph)+offset).

Fit	A	P (day)	ph	Offset
S_MWO only 33 yr period	0.03	12311.1	−63.5	0.49
S_MWO 2 sine curves	0.021	3984.118	−6.273	0.49
	0.017	1061.453	1.1665
S_MWO 3 sine curves	−0.0317	12 578.057	60.247	0.49
	0.0187	3960.685	12.408
	−0.0191	1061.911	29.052
S_MWO TIGRE, 3yr cycle	−0.034	927.9	−1197.2	0.47
S_{Ca IRT a} ^(a) 3yr cycle	−0.0030	958.7	−662.7	0.15
S_{Ca IRT b} 3yr cycle	−0.0039	922.7	−1291.3	0.12
S_{Ca IRT c} 3yr cycle	−0.0007	932.4	−1117.9	0.02

Notes. ^(a) Indices a, b, and c refer to the individual lines of the triplet in the order of increasing wavelength.

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