Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke6025.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 6025. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
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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