Keck Spectroscopy of Red Giant Stars in the Vicinity of M31' s Massive Globular Cluster G1

Abstract

We present results from an ongoing Keck spectroscopic survey of red giant stars in a field located along the major axis of M31, ≈ 34 kpc in projection from the nucleus and near the luminous globular cluster G1. We use multislit LRIS spectroscopy to measure the Ca ii near- infrared triplet in 41 stars ranging in apparentmagnitude from20 < I < 22. Of these, 23 stars are found to have radial velocities v