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Properties of Star Clusters

Buckner, Anne (2016) Properties of Star Clusters. Doctor of Philosophy (PhD) thesis, University of Kent.

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Abstract

Star clusters are tracers of both stellar and Galactic evolution. As such it is essential to analyse their properties and distribution in the Galaxy. Ideally clusters’ fundamental properties (distance, reddening, age, metallicity) should be derived homogeneously, so that their uncertainties are systematic and any global trends identified can be trusted. With the increase

as 2MASS, WISE, UKIDSS-GPS and VISTA-VVV, new methods to reliably derive these

and scale height measurements of cluster samples. Distances and extinctions are derived from

with a better than 40% accuracy. Cluster ages are derived using a pipeline which is designed

measurements are established with a 25% uncertainty for a sample size of 38. Using these methods, the FSR List cluster catalogue is found to be biased towards a distance of 3 kpc and modal age of 400 Myr. A dependence between the interstellar absorption value and Galactic longitude is found, characterised by AH (l)[mag/kpc] = 0.10+0.001 × |l?180 ? |/ ? for regions more than 60 ? from the Galactic Centre.

The temporal scale height evolution of clusters is accurately traced for the first time. A linear

relationship between cluster scale height and log(age/yr) is found which is significantly different from the stellar component of the Galactic Disk. There is also a weak age-independent trend between cluster scale height and Galactocentric distance. No significant temporal or spatial variations of the cluster distribution vertical zero point are found. The Sun’s vertical displacement from the Galactic Plane is measured to be Z? = 18.5 ± 1.2 pc.

Item Type: Thesis (Doctor of Philosophy (PhD))
Thesis advisor: Froebrich, Dirk
Thesis advisor: Smith, Michael
Uncontrolled keywords: Open Star Clusters Stellar Associations Stars Fundamental Novel Properties Parameters Distances Extinction Age Scale Height Statistics ISM Interstellar Absorption Dust Galactic Structure Plane Disk Galaxy Evolution Milky Way Observational Astrophysics NIR Near Infrared Solar Neighbourhood Main Sequence 2MASS WISE UKIDSS-GPS VISTA-VVV FSR List Cluster Catalogue MWSC DAML02 WEBDA Galactocentric Longitude Latitude
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Users 1 not found.
Date Deposited: 31 Mar 2016 13:00 UTC
Last Modified: 25 Jan 2020 04:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/54764 (The current URI for this page, for reference purposes)
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