We present a detailed spectroscopic analysis of horizontal branch stars in the globular cluster NGC 3201 .
We collected optical ( 4580–5330 Å ) , high resolution ( \sim 34,000 ) , high signal-to-noise ratio ( \sim 200 ) spectra for eleven RR Lyrae stars and one red horizontal branch star with the multifiber spectrograph M2FS at the 6.5m Magellan telescope at the Las Campanas Observatory .
From measured equivalent widths we derived atmospheric parameters and abundance ratios for \alpha ( Mg , Ca , Ti ) , iron peak ( Sc , Cr , Ni , Zn ) and s-process ( Y ) elements .
We found that NGC 3201 is a homogeneous , mono-metallic ( [ Fe/H ] = -1.47 \pm 0.04 ) , \alpha -enhanced ( [ \alpha /Fe ] = 0.37 \pm 0.04 ) cluster .
The relative abundances of the iron peak and s-process elements were found to be consistent with solar values .
In comparison with other large stellar samples , NGC 3201 RR Lyraes have similar chemical enrichment histories as do those of other old ( t \geq 10 Gyr ) Halo components ( globular clusters , red giants , blue and red horizontal branch stars , RR Lyraes ) .
We also provided a new average radial velocity estimate for NGC 3201 by using a template velocity curve to overcome the limit of single epoch measurements of variable stars : V _ { \text { rad } } = 494 \pm 2 km s ^ { -1 } ( \sigma =8 km s ^ { -1 } ) .