Open Cluster LW 55 in the Large Magellanic Cloud

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galaxies: Individual: Name: Large Magellanic Cloud, Galaxies: Star Clusters- Galaxies: Magellanic Clouds, Techniques: Photometric

Scientific paper

The field of the moderately old open cluster LW 55 in the outer parts of the Large Magellanic Cloud disk was monitored for detection of short-period variable stars over two nights. Eight variables were found; all but one (a detached eclipsing binary) are small-amplitude (ΔV<=0.1 mag) pulsating stars of the δ Scuti, SX Phoenicis, or γ Doradus type. The BV color-magnitude diagram extends down to the solar-type stars at V=24 (MV~=5.2). The cluster age is estimated at 1.5 Gyr for Z=0.004 ([Fe/H]=-0.67) the surrounding stellar field is older, with an age greater than 4 Gyr.
Based on data obtained at Las Campanas Observatory, operated by the Carnegie Institution of Washington, during the University of Toronto time allocation.

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