The old metal-poor open cluster ESO 92-SC05: accreted from a dwarf galaxy?

Details The old metal-poor open cluster ESO 92-SC05: accreted from a dwarf galaxy? The old metal-poor open cluster ESO 92-SC05: accreted from a dwarf galaxy?

2008-05-14

arxiv.org/abs/0805.2117v1

Astronomy and Astrophysics

Astrophysics

11 figures: 1, 2a,b,c, 3a,b, 4a,b, 5, 6, 7 6 pages to compile with mn2e.cls. Monthly Notices of the Royal Astronomical Society

Scientific paper

10.1111/j.1365-2966.2008.13427.x

The study of old open clusters outside the solar circle can bring constraints on formation scenarios of the outer disk. In particular, accretion of dwarf galaxies has been proposed as a likely mechanism in the area. We use BVI photometry for determining fundamental parameters of the faint open cluster ESO 92-SC05. Colour-Magnitude Diagrams are compared with Padova isochrones, in order to derive age, reddening and distance. We derive a reddening E(B-V)= 0.17, and an old age of $\sim$6.0 Gyr. It is one of the rare open clusters known to be older than 5 Gyr. A metallicity of Z$\sim$0.004 or [M/H]$\sim$-0.7 is found. The rather low metallicity suggests that this cluster might be the result of an accretion episode of a dwarf galaxy.

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