M25

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Stars, Stellar Populations And Star Clusters

Scientific paper

M25 is an intermediate-age (90 million years) open cluster in Sagittarius that was discovered by de Chéseaux in 1746. It has a visual magnitude of 6.5 and is conspicuous even with normal binoculars. Because of its relatively small distance (about 2000 light-years) and the comparative ease with which it can be observed, it was one of the first used for studies of variable stars. In 1960, Allan San...

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