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Table 6

Extent of the chromospheric line-forming regions. The extents are given in UD angular diameter and in stellar radius.

Name UD Angular diameter (θUD in mas) Linear radius (in R)
Ca II/849 nm Ca II/854 nm Ca II/866 nm Hα Ca II/849 nm Ca II/854 nm Ca II/866 nm Hα

β Ceti 5.82 ± 0.20 6.40 ± 0.23 6.58 ± 0.24 1.16 ± 0.04 1.27 ± 0.05 1.31 ± 0.05
η Ceti 4.40 ± 0.19 4.87 ± 0.20 5.05 ± 0.24 1.25 ± 0.05 1.38 ± 0.06 1.43 ± 0.07
δ Crateris 5.10 ± 0.30 5.13 ± 0.18 1.46 ± 0.09 1.47 ± 0.05
ρ Bootis 4.86 ± 0.28 1.25 ± 0.08

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