How Well-Defined are Young Stellar Associations?

Details How Well-Defined are Young Stellar Associations? How Well-Defined are Young Stellar Associations?

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344218c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #442.18; Bulletin of the American Astronomical Society, Vol. 41, p.322

Astronomy and Astrophysics

Astronomy

Scientific paper

As measured by the two-point autocorrelation function, the clustering of resolved young stars within several Local Group galaxies is observed to be scale-free above about ten parsecs, with the exception of a transition at several hundred parsecs (approximately the disk scale height). A scale-free correlation function is consistent with either a lack of any statistically well-defined clusters (for example, random or fractal distribution), or with a few well-defined clusters on different scales that do not combine to produce a detectable feature. By examining the properties of individual clusters and associations and comparing them with those produced by random and fractal models, we identify the clusters that are statistically well-defined and assess their impact on the correlation function.

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