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Precise Radial Velocities Of Giant Stars Iv. A Correlation Between Surface Gravity And Radial Velocity Variation And A Statistical Investigation Of Companion Properties., S. Hekker, I. A.G. Snellen, C. Aerts, A. Quirrenbach, S. Reffert, D. S. Mitchell
Precise Radial Velocities Of Giant Stars Iv. A Correlation Between Surface Gravity And Radial Velocity Variation And A Statistical Investigation Of Companion Properties., S. Hekker, I. A.G. Snellen, C. Aerts, A. Quirrenbach, S. Reffert, D. S. Mitchell
Physics
Context. Since 1999, we have been conducting a radial velocity survey of 179 K giants using the Coudé Auxiliary Telescope at UCO/Lick observatory. At present ∼20−100 measurements have been collected per star with a precision of 5 to 8 m s−1. Of the stars monitored, 145 (80%) show radial velocity (RV) variations at a level >20 m s−1, of which 43 exhibit significant periodicities.
Aims. Our aim is to investigate possible mechanism(s) that cause these observed RV variations. We intend to test whether these variations are intrinsic in nature, or possibly induced by companions, or both. …