Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120.3088c&link_type=abstract
The Astronomical Journal, Volume 120, Issue 6, pp. 3088-3097.
Astronomy and Astrophysics
Astronomy
27
Galaxies: Individual: Ngc Number: Ngc 6822, Galaxies: Star Clusters, Galaxies: Stellar Content, Ism: H Ii Regions
Scientific paper
We present optical spectroscopy of four star clusters and six H II regions in the nearby, dwarf irregular galaxy NGC 6822. From the data, we estimate ages of 2.5+1.5-1.0×107, 2.0+3.0-1.0×108, 1.4+1.1-0.6×109, and 10+/-2×109 yr for clusters H VI, C21, H VIII, and H VII, respectively. For clusters H VI and H VII we estimate [Fe/H]~-1.46+/-0.26 and ~-2.0, lower than Large and Small Magellanic Cloud clusters at similar ages. Mass estimates for H VI, H VII, and H VIII demonstrate that clusters with typical globular cluster masses (>104 Msolar) have formed over the lifetime of NGC 6822. For six H II regions, ionic abundances are derived for element species of N, O, S, and Ne. These show that there is a correlation of abundance with position, the highest oxygen abundance H II regions being located off the main body of the galaxy. Based on Observations with the Cerro Tololo Inter-American Observatory.
Bianchi Luciana
Chandar Rupali
Ford Holland C.
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