Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke6023.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 6023. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Stars, Stellar Populations And Star Clusters
Scientific paper
M23 is a very poor, loose open cluster in Sagittarius (one of Messier's original discoveries) with boundaries that are difficult to define. So far, 150 stars within a linear diameter of about 15 light-years have been shown to be members. The cluster is old for an open cluster (about 300 million years) and is thought to have spent a large fraction of its lifetime in the gas-poor regions between th...
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