HIGH-RESOLUTION ABUNDANCE ANALYSIS OF 2 STARS NEAR THE GLOBULAR-CLUSTER NGC-6522 PROJECTED IN BAADES WINDOW

The CASPEC echelle spectrograph at the ESO 3.6 m telescope was used to obtain high resolution spectra of Arp 1145 and Arp 2240, two stars of the Baade Window, near the globular cluster NGC 6522. The stars were selected from the list of Pickles and van der Kruit (1990), as one bei ng metal-poor and the other one metal-rich. From a detailed analysis u sing equivalent widths and spectrum synthesis we derive the stellar pa rameters (T-eff log g and [M/H]) = (4750, 1.2, -0.9) and (5000, 2.15, +0.2), respectively for Arp 1145 and Arp 2240. For the metal-poor star Arp 1145, excesses of oxygen, calcium and titanium relative to iron a re found; it may be a member of NGC 6522 or a halo star now traversing the bulge. Arp 2240, showing nearly solar metallicity and solar abund ance ratios seems to belong to the inner disk population. The metallic ity for the metal-rich star Arp 2240 indicates that previous work base d on mid-resolution spectra tended to overestimate metallicities of me tal-rich stars by approximate to 0.2-0.3 dex, in agreement with the re cent results by McWilliam and Rich (1994).