Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21530805b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #308.05; Bulletin of the American Astronomical Society, Vol. 42, p.306
Astronomy and Astrophysics
Astronomy
Scientific paper
: The concept of kinematic assemblages evolving from dispersed stellar clusters has remained contentious since Eggen's initial formulation of moving groups in the 1960's. However, the availability of high quality parallaxes from the Hipparcos space astrometry mission has resulted in distance measurements for thousands of nearby, seemingly isolated stars. With these newly determined distances, a high resolution spectroscopic abundance analysis can be brought to bear on many of the alleged members of these relic associations. If a structure is a relic of an open cluster, the members can be expected to be monolithic in age and abundance inasmuch as homogeneity is observed in young open clusters. In this work we have examined 34 members of the Wolf 630 moving group using high resolution stellar spectroscopy. The stars of the sample have been chemically tagged to determine abundance homogeneity and confirm the existence of a homogeneous subsample of 19 stars. Fitting the homogeneous subsample with Yale-Yonsei isochrones, yields a single evolutionary sequence of 2.7 ±0.5 Gyr. It is concluded that this 19 star subsample of the Wolf 630 moving group sample of 34 stars could represent a dispersed cluster with an =-0.01 ±0.02 and an age of 2.7 ± 0.5 Gyr.
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