Gaia Data Release 2
Open Access

Fig. 20

image

Comparison of the RVS spectra of HIP46933 and HIP84551. The weak neutral lines are on average stronger in the former, which is cooler, Teff = 4487 K, than in the latter, Teff = 6517 K, and therefore allow us to derive radial velocities with higher precision (at similar GRVS magnitude).

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