Journal
ASTROPHYSICAL JOURNAL
Volume 841, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/aa70a2
Keywords
Magellanic Clouds; stars: evolution; stars: interiors
Categories
Funding
- National Science Foundation [1501205]
- NASA from the Space Telescope Science Institute [AR-13901]
- NASA [NAS5-26555]
- NASA Office of Space Science [NNX09AF08G]
- FAS Division of Science, Research Computing Group at Harvard University
- National Aeronautics and Space Administration
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1501205] Funding Source: National Science Foundation
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We present a framework to simultaneously constrain the values and uncertainties of the strength of convective core overshooting, metallicity, extinction, distance, and age in stellar populations. We then apply the framework to archival Hubble Space Telescope observations of six stellar clusters in the Large Magellanic Cloud that have reported ages between similar to 1-2.5 Gyr. Assuming a canonical value of the strength of core convective overshooting, we recover the well-known age-metallicity correlation, and additional correlations between metallicity and extinction and metallicity and distance. If we allow the strength of core overshooting to vary, we find that for intermediate-aged stellar clusters, the measured values of distance and extinction are negligibly effected by uncertainties of core overshooting strength. However, cluster age and metallicity may have disconcertingly large systematic shifts when Lambda(c) is allowed to vary by more than +/- 0.05 H-p. Using the six stellar clusters, we combine their posterior distribution functions to obtain the most probable core overshooting value, 0.500(-0.134)(+0.016) H-p, which is in line with canonical values.
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