We present detailed chemical compositions of 10 red giant star members of the Galactic ( open ) cluster NGC 752 , derived from high-resolution ( R \approx 60,000 ) , high signal-to-noise ( S / N \geq 140 ) spectra .
We confirmed cluster memberships by measuring the stellar radial velocities , and by deriving model atmosphere parameters ( T _ { eff } , log g , [ Fe/H ] and \xi _ { t } ) from equivalent widths of Fe i , Fe ii , Ti i , and Ti ii lines .
The metallicity we obtained for NGC 752 ( [ Fe/H ] = - 0.02 \pm 0.05 ) is in good agreement with previous studies .
We derived abundances of \alpha ( Mg , Si , Ca ) , light odd-Z ( Na , Al ) , Fe-group ( Sc , Ti , V , Cr , Mn , Fe , Co , Ni , Cu , Zn ) , n -capture ( Y , La , Nd , Eu ) , and p -capture ( Li , C , N , O ) species for each star .
Furthermore , we also derived abundances of the LiCNO p -capture element group and carbon isotopic ratios , using synthetic spectrum analyses of the Li i 6707 Å resonance doublet , the [ O i ] line at 6300 Å , the CH G-band features near 4311 and 4325 Å , the C _ { 2 } bandheads at 5160 and 5631 Å , and ^ { 12 , 13 } CN red system lines in the 7995 - 8040 Å region .
By applying recent isochrones to NGC 752 photometry , and comparing the color-magnitude diagram information to our Li abundances and ^ { 12 } C/ ^ { 13 } C ratios , we suggest that the 10 observed red giants can be separated into three first-ascent , six red-clump and one red horizontal branch star .