Rotational behavior of metal-poor stars

Our sample is comprised of stars in the field and some Galactic globular clusters, including stars on the main sequence, the red giant branch (RGB), and the horizontal branch (HB). The metal-poor stars are, mainly, slow rotators, and their vsini distribution along the HR diagram is quite homogeneous.

Nevertheless, a few moderate to high values of vsini are found in stars located on the main sequence and the HB. We show that the overall distribution of vsini values is basically independent of metallicity for the stars in our sample. We present an extensive tabulation of all quantities discussed in this paper, including rotation velocities, temperatures, gravities, and metallicities [Fe/H], as well as broadband magnitudes and colors.