A BAYESIAN ANALYSIS OF THE AGES OF FOUR OPEN CLUSTERS

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Title: A BAYESIAN ANALYSIS OF THE AGES OF FOUR OPEN CLUSTERS
Author(s): Jeffery, EJ
Von Hippel, T
Van Dyk, DA
Stenning, DC
Robinson, E
Stein, N
Jefferys, WH
Item Type: Journal Article
Abstract: In this paper we apply a Bayesian technique to determine the best fit of stellar evolution models to find the main sequence turn off age and other cluster parameters of four intermediate-age open clusters: NGC 2360, NGC 2477, NGC 2660, and NGC 3960. Our algorithm utilizes a Markov chain Monte Carlo technique to fit these various parameters, objectively finding the best fit isochrone for each cluster. The result is a high precision isochrone fit. We compare these results with the those of traditional “by eye” isochrone fitting methods. By applying this Bayesian technique to NGC 2360, NGC 2477, NGC 2660, and NGC 3960 we determine the ages of these clusters to be 1.35 ± 0.05, 1.02 ± 0.02, 1.64 ± 0.04, and 0.860 ± 0.04 Gyr, respectively. The results of this paper continue our effort to determine cluster ages to higher precision than that offered by these traditional methods of isochrone fitting.
Publication Date: 6-Sep-2016
Date of Acceptance: 20-Jun-2016
URI: http://hdl.handle.net/10044/1/34011
DOI: https://dx.doi.org/10.3847/0004-637X/828/2/79
ISSN: 1538-4357
Publisher: American Astronomical Society
Journal / Book Title: Astrophysical Journal
Volume: 828
Copyright Statement: © 2016. The American Astronomical Society. All rights reserved.
Sponsor/Funder: The Royal Society
Commission of the European Communities
European Commission
Funder's Grant Number: WM110023
FP7-PEOPLE-2012-CIG-321865
H2020-MSCA-RISE-2015-691164
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
open clusters and associations: general
open clusters and associations: individual
(NGC 2360, NGC 2477, NGC 2660, NGC 3960)
OLD OPEN CLUSTERS
GALACTIC CHEMICAL EVOLUTION
COLOR-MAGNITUDE DIAGRAMS
WHITE-DWARF AGE
STELLAR EVOLUTION
RED GIANTS
CCD PHOTOMETRY
KEY TRACERS
NGC 2360
PARAMETERS
Astronomy & Astrophysics
0201 Astronomical And Space Sciences
0305 Organic Chemistry
0306 Physical Chemistry (Incl. Structural)
Publication Status: Published
Article Number: 79
Appears in Collections:Mathematics
Statistics
Faculty of Natural Sciences



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