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Table 3

Reference parameters of the benchmark stars.

Star T eff σ T eff log g σ log  g [Fe/H] σ [ Fe / H ] Parameter Remark
(K) (K) (dex) (dex) (dex) (dex) Space
Sun 5777 1 4.44 0.01 0.00 0.01 MRD Used in iDR2; only archival data
Arcturus 4247 28 1.59 0.04 −0.53 0.01 MRG Only archival data
Procyon 6545 82 3.99 0.02 −0.04 0.01 MRD Problems with order merging
18 Sco 5747 29 4.43 0.01 0.01 0.01 MRD Used in iDR2
61 Cyg A 4339 22 4.43 0.16 −0.33 0.03 MRD Only archival data
61 Cyg B 4045 20 4.53 0.04 −0.38 0.02 MRD Only archival data
Alf Cen A 5847 68 4.31 0.02 0.24 0.01 MRD Used in iDR2
Alf Cet 3796 64 0.91 0.08 −0.45 0.05 MRG Cool star; only archival data
Alf Tau 3927 39 1.22 0.10 −0.37 0.02 MRG Cool star; only archival data
Bet Ara 4172 48 1.01 0.13 −0.05 0.04 MRG Used in iDR2
Bet Gem 4858 55 2.88 0.05 0.12 0.01 MRG Only archival data
Bet Hyi 5873 38 3.98 0.02 −0.07 0.01 MRD Used in iDR2
Bet Vir 6083 17 4.08 0.01 0.21 0.01 MRD Used in iDR2; problems with order merging
Del Eri 5045 59 3.77 0.02 0.06 0.01 MRD Used in iDR2
Eps Eri 5050 25 4.60 0.03 −0.10 0.01 MRD Only archival data
Eps For 5069 59 3.45 0.05 −0.62 0.01 MRD Used in iDR2
Eps Vir 4983 56 2.77 0.01 0.13 0.01 MRG Only archival data
Eta Boo 6105 19 3.80 0.02 0.30 0.01 MRD Used in iDR2; vsini≃ 12.7 km s-1
Gam Sge 3807 48 1.05 0.10 −0.16 0.04 MRG Used in iDR2; cool star
Ksi Hya 5044 33 2.87 0.01 0.14 0.01 MRG Used in iDR2
Mu Ara 5845 29 4.27 0.02 0.33 0.01 MRD Used in iDR2
Mu Leo 4474 52 2.50 0.07 0.26 0.02 MRG Used in iDR2
Tau Cet 5331 15 4.44 0.02 −0.50 0.01 MRD Used in iDR2
HD 22879 5786 16 4.23 0.02 −0.88 0.01 MRD Used in iDR2
HD 49933 6635 18 4.21 0.03 −0.46 0.01 MRD Used in iDR2; vsini≃ 10.0 km s-1
HD 84937 6275 17 4.11 0.06 −2.09 0.02 MPS Used in iDR2; metal-poor star; only archival data
HD 107328 4496 53 2.11 0.07 −0.34 0.01 MRG Used in iDR2
HD 122563 4587 54 1.61 0.07 −2.74 0.01 MPS Used in iDR2; metal-poor star
HD 140283 5720 29 3.67 0.04 −2.43 0.02 MPS Used in iDR2; metal-poor star
HD 220009 4275 50 1.43 0.10 −0.75 0.01 MRG Used in iDR2

Notes. Teff and log g are direct determinations (see Heiter et al., in prep.). Metallicities were derived by Jofré et al. (2014). The metallicity uncertainty listed here only reflects the standard deviation of the mean abundance of the Fe i lines. Also given is the parameter space group to which the star belongs (MRD, MRG, or MPS – see text.)

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