<i>Gaia</i> spectroscopic orbits validated with LAMOST and GALAH radial velocities

ABSTRACT The recently published Gaia DR3 catalogue of $181\, 327$ spectroscopic binaries (SB) includes the Keplerian elements each orbit but not measured radial velocities (RVs) and their epochs. Instead, lists a few parameters that characterize robustness solution. In this work, we use two external sources to validate orbits – $17\, 563$ LAMOST DR6 $6 018$ GALAH stars with RVs have Gaia-SB orbits. We compare expected RVs, based on orbits, measurements. Finding some are inconsistent these measurements, constructed function estimates probability be correct, using robust parameters. devise clean still very large single-lined (SB1) sample $91\, 740~$ differs from parent by absence physically unlikely hence presumably spurious short-period high eccentricity. SB1 offers prospect thorough statistical studies binary population after carefully modelling remaining selection effects. At first look, possible features emerge paucity low-mass primaries, which might result observational bias, subsample main-sequence circular probable evidence for circularization processes.