Searching for old open clusters

Details Searching for old open clusters Searching for old open clusters

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005asthe..98..583h&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 98, No. 9, p. 583 - 588 (2005)

Astronomy and Astrophysics

Astronomy

Open Clusters, Ages

Scientific paper

In this article, the authors describe a search activity of old open clusters at Gunma Astronomical Observatory, using a very small telescope of 65 cm diameter. This is an extended effort of the public course of the astronomy given at this observatory in 2000-2001. At this writing, 33 clusters are dated to be older than 1 Gyr, except only three. Our sample constitutes the majority in the sample of open clusters older than 1 Gyr in the outer disk. Several clusters are, tentatively, richer in metal than the canonical metallicity gradient found in the Galactic disk. A cluster is found to have red clump stars alined at the nominal red clump position, providing an exciting sample to identify their physical origin in the future.

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