High-resolution abundance analysis of two stars near the globular cluster NGC 6522 projected in Baade's Window.

Details High-resolution abundance analysis of two stars near the globular cluster NGC 6522 projected in Baade's Window. High-resolution abundance analysis of two stars near the globular cluster NGC 6522 projected in Baade's Window.

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..111...17c&link_type=abstract

Astronomy and Astrophysics Supplement, v.111, p.17

Astronomy and Astrophysics

Astrophysics

7

Bulge, Globular Clusters, Abundances

Scientific paper

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 & van der Kruit (1990), as one being metal-poor and the other one metal-rich. From a detailed analysis using equivalent widths and spectrum synthesis we derive the stellar parameters (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 are 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 abundance ratios seems to belong to the inner disk population. The metallicity for the metal-rich star Arp 2240 indicates that previous work based on mid-resolution spectra tended to overestimate metallicities of metal-rich stars by =~0.2-0.3dex, in agreement with the recent results by McWilliam & Rich (1994).

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