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Where the blue stragglers roam: searching for a link between formation and environment

Where the blue stragglers roam: searching for a link between formation and environment
Where the blue stragglers roam: searching for a link between formation and environment
Current observational evidence seems to indicate that blue stragglers are a dynamically created population, though exactly how the mechanism(s) of formation operates remains a mystery. We search for links between blue straggler formation and environment by considering only those stars found within one core radius of the cluster center. In so doing, we aim to isolate a sample that is representative of an approximately uniform cluster environment where, ideally, a single blue straggler formation mechanism is predominantly operating. Normalized blue straggler frequencies are found and apart from new anticorrelations with the central velocity dispersion and the half-mass relaxation time, we find no other statistically significant trends.

Concerns regarding the method of normalization used to calculate relative blue straggler frequencies are discussed, specifically whether the previously observed anticorrelation with total cluster mass (see Piotto et al. 2004) is a consequence of the normalization process. A new correlation between the observed number of blue stragglers in the core and the number predicted from single-single collisions alone is presented. This new link between formation and environment represents the first direct evidence that the blue straggler phenomenon has, at least in part, a collisional origin
blue stragglers, globular clusters: general
331-335
Leigh, Nathan
90069e68-a317-4cce-92e3-2401e3518751
Sills, Alison
2f7067f6-89a0-4738-b60e-a25e8b7a434d
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Leigh, Nathan
90069e68-a317-4cce-92e3-2401e3518751
Sills, Alison
2f7067f6-89a0-4738-b60e-a25e8b7a434d
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e

Leigh, Nathan, Sills, Alison and Knigge, Christian (2007) Where the blue stragglers roam: searching for a link between formation and environment. Proceedings of the International Astronomical Union, 3 (S246), 331-335. (doi:10.1017/S1743921308015871).

Record type: Article

Abstract

Current observational evidence seems to indicate that blue stragglers are a dynamically created population, though exactly how the mechanism(s) of formation operates remains a mystery. We search for links between blue straggler formation and environment by considering only those stars found within one core radius of the cluster center. In so doing, we aim to isolate a sample that is representative of an approximately uniform cluster environment where, ideally, a single blue straggler formation mechanism is predominantly operating. Normalized blue straggler frequencies are found and apart from new anticorrelations with the central velocity dispersion and the half-mass relaxation time, we find no other statistically significant trends.

Concerns regarding the method of normalization used to calculate relative blue straggler frequencies are discussed, specifically whether the previously observed anticorrelation with total cluster mass (see Piotto et al. 2004) is a consequence of the normalization process. A new correlation between the observed number of blue stragglers in the core and the number predicted from single-single collisions alone is presented. This new link between formation and environment represents the first direct evidence that the blue straggler phenomenon has, at least in part, a collisional origin

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Published date: 2007
Keywords: blue stragglers, globular clusters: general

Identifiers

Local EPrints ID: 144211
URI: http://eprints.soton.ac.uk/id/eprint/144211
PURE UUID: 2bd8da2d-cb1a-40e6-abcd-eeb61a96d1cc

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Date deposited: 07 Jun 2010 13:03
Last modified: 08 Nov 2021 18:10

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Contributors

Author: Nathan Leigh
Author: Alison Sills

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