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We present 5201 radial-velocity measurements of 1144 stars, as part of anongoing study of the young (150 Myr) open cluster M35 (NGC 2168). We haveobserved M35 since 1997, using the Hydra Multi-Object Spectrograph on the WIYN3.5m telescope. Our stellar sample covers main-sequence stars over a magnituderange of 13.0<V<16.5 (1.6 - 0.8 Msun) and extends spatially to a radius of 30arcminutes (7 pc in projection at a distance of 805 pc or 4 core radii). Due toits youth, M35 provides a sample of late-type stars with a range of rotationperiods. Therefore, we analyze the radial-velocity measurement precision as afunction of the projected rotational velocity. For narrow-lined stars (v sin i< 10 km/s), the radial velocities have a precision of 0.5 km/s, which degradesto 1.0 km/s for stars with v sin i = 50 km/s. The radial-velocity distributionshows a well-defined cluster peak with a central velocity of -8.16 +/- 0.05km/s, permitting a clean separation of the cluster and field stars. For starswith >=3 measurements, we derive radial-velocity membership probabilities andidentify radial-velocity variables, finding 360 cluster members, 55 of whichshow significant radial- velocity variability. Using these cluster members, weconstruct a color-magnitude diagram for our stellar sample cleaned of fieldstar contamination. We also compare the spatial distribution of the single andbinary cluster members, finding no evidence for mass segregation in our stellarsample. Accounting for measurement precision, we place an upper limit on theradial-velocity dispersion of the cluster of 0.81 +/- 0.08 km/s. Aftercorrecting for undetected binaries, we derive a true radial-velocity dispersionof 0.65 +/- 0.10 km/s.

WIYN Open Cluster Study. XXXVIII. Stellar Radial Velocities in the Young Open Cluster M35 (NGC 2168)