The catalogue of radial velocity standard stars for Gaia - I. Pre-launch release

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Table 2

RV offsets between instruments derived for stars in common.

Instruments	N_common	N_∗	Offset
		^a	(m s^-1)

CORALIE−SOPHIE	164	154	–23 ± 2.4
NARVAL−SOPHIE	114	108	–26 ± 6.2
ELODIE−SOPHIE	277	247	^b
HARPS−SOPHIE	36	34	17 ± 5.0
HARPS−CORALIE	88	84	31 ± 1.5

Notes.

^(a)

N_∗ is the number of stars effectively used after an iterative clipping at a 3σ level.

^(b)

In the case of ELODIE−SOPHIE a linear regression was performed, giving an offset as a function of the colour index Offset = − 259.0(B − V) + 105.2 ± 2.9 m s^-1.

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