Key points are not available for this paper at this time.
The discovery of the radial velocity ( ) signatures of planets around several solar-like stars highlights the v r importance of exploring the sources of variations intrinsic to the stars themselves. We study the stars in the v r Lick planetary survey for variations related to stellar activity: the rotation of starspots and convective inhom- v r ogeneities and their temporal evolution. We study the relationships between the weighted dispersion, (which v j r v has first been corrected for the orbital contribution from known planets and the mean internal error), and spectral type, rotation, and activity (as measured by Ca ii H and K). We find that the largest values occur among both j v the coolest (dMe) and the warmest (active F) stars. Values of increase with H and K emission and scale # j v proportional to in G and K stars and proportional to in F stars. For a G star with # 1.3 v sin i (v sin i) v sin i 8--10 km s (age #0.3 Gyr), for example, , roughly consistent with the p...
Saar et al. (Sun,) studied this question.