A catalog of rotational and radial velocities for evolved stars. IV. Metal-poor stars ⋆,⋆⋆

Aims. The present paper describes the first results of an observational program intended to refine and extend the existing $v \sin i$ measurements of metal-poor stars, with an emphasis on field evolved stars. Methods. The survey was carried out with the FEROS and CORALIE spectrometers. For the $v \sin i$ measurements, obtained from spectral synthesis, we estimate an uncertainty of about 2.0 ${\rm km\,s}^{-1}$. Results. Precise rotational velocities ${v\sin i}$ are presented for a large sample of 100 metal-poor stars, most of them evolving off the main–sequence. For the large majority of the stars composing the present sample, rotational velocities have been measured for the first time.