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The Astrophysical Journal
Article . 2008 . Peer-reviewed
Data sources: Crossref
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Caltech Authors
Article . 2008
Data sources: Caltech Authors
https://dx.doi.org/10.48550/ar...
Article . 2008
License: arXiv Non-Exclusive Distribution
Data sources: Datacite
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Spatial Distributions of Young Stars

Authors: Kraus, Adam L.; Hillenbrand, Lynne A.;

Spatial Distributions of Young Stars

Abstract

We analyze the spatial distributions of young stars in Taurus-Auriga and Upper Sco as determined from the two-point correlation function (i.e. the mean surface density of neighbors). The corresponding power-law fits allow us to determine the fractal dimensions of each association's spatial distribution, measure the stellar velocity dispersions, and distinguish between the bound binary population and chance alignments of members. We find that the fractal dimension of Taurus is D~1.05, consistent with its filamentary structure. The fractal dimension of Upper Sco may be even shallower (D~0.7), but this fit is uncertain due to the limited area and possible spatially-variable incompleteness. We also find that random stellar motions have erased all primordial structure on scales of <0.07 degrees in Taurus and <1.7 degrees in Upper Sco; given ages of ~1 Myr and ~5 Myr, the corresponding internal velocity dispersions are ~0.2 km/s and ~1.0 km/s, respectively. Finally, we find that binaries can be distinguished from chance alignments at separations of <120" (17000 AU) in Taurus and 75" (11000 AU) in Upper Sco. The binary populations in these associations that we previously studied, spanning separations of 3-30", are dominated by binary systems. However, the few lowest-mass pairs (M_prim < 0.3 M_sun) might be chance alignments.

Accepted to ApJL; 5 pages, 2 figures in emulateapj format

Country
United States
Related Organizations
Keywords

methods: statistical, stars: formation, Astrophysics (astro-ph), FOS: Physical sciences, stars: pre-main-sequence, stars: kinematics, Astrophysics, 530, binaries: visual, stars: statistics

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
83
Top 10%
Top 10%
Top 10%
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