The Ca ii infrared triplet’s performance as an activity indicator compared to Ca ii H and K - Empirical relations to convert Ca ii infrared triplet measurements to common activity indices

Free Access

Table 3

Relations to estimate the excess flux in a Ca II IRT line from measurements of another.


Source line	Target line


	Ca ii IRT λ8498	Ca ii IRT λ8542	Ca ii IRT λ8662


Ca ii IRT λ8498		F_{Exc,IRT λ8542} = 1.232 × F_{Exc,IRT λ8498}	F_{Exc,IRT λ8662} = 1.006 × F_{Exc,IRT λ8498}
Ca ii IRT λ8542	F_{Exc,IRT λ8498} = 0.801 × F_{Exc,IRT λ8542}		F_{Exc,IRT λ8662} = 0.808 × F_{Exc,IRT λ8542}
Ca ii IRT λ8662	F_{Exc,IRT λ8498} = 0.976 × F_{Exc,IRT λ8662}	F_{Exc,IRT λ8542} = 1.210 × F_{Exc,IRT λ8662}

Notes. The errors of such a conversion are about 30 000 erg s^-1 cm^-2.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.