Context : Their high intrinsic brightness and small dispersion in absolute magnitude make red clump ( RC ) stars a prime tracer of Galactic structure and kinematics .

Aims : We aim to derive accurate , multi-epoch radial velocities and atmospheric parameters ( T _ { eff } , \log g , [ M/H ] , V _ { rot } \sin i ) of a large sample of carefully selected RC stars , fainter than those present in other spectroscopic surveys and located over a great circle at high Galactic latitudes .

Methods : We acquired data of the program stars of high signal-to-noise ratio ( S/N ) and high resolution with the Asiago Echelle spectrograph .
Radial velocities were obtained by applying cross-correlation and atmospheric parameters via \chi ^ { 2 } fit to a synthetic spectral library .
Extensive tests were carried out by re-observing with the same instrument a large number of standard stars taken from a variety of sources in the literature .
During these tests , we found that the absolute Tycho V _ { T } magnitude of local red clump stars is not dependent on metallicity

Results : A total of 277 red clump stars ( 101 of them with a second epoch observation ) of the extended solar neighborhood and 55 calibration stars were observed and included in an output catalog that contains ( in addition to relevant support astrometric and photometric data taken from literature ) the main output of our survey : accurate multi-epoch radial velocities ( \sigma ( RV ) _ { \odot } \leq 0.4 km/s ) , accurate atmospheric parameters ( \sigma ( T _ { eff } ) =68 K , \sigma ( \log g ) =0.11 dex , \sigma ( [ M/H ] ) =0.10 dex , \sigma ( V _ { rot } \sin i ) =1.1 km/sec ) , distances , and space velocities ( U , V , W ) .

Conclusions :