Title

Isochrone Fitting of Hubble Data in UV-Vis-IR Bands

Abstract

Stellar evolution models are an important tool used by astronomers to study star clusters. By plotting stars within a cluster in terms of their color and magnitude, we can fit these highly complex theoretical models to the data and determine important information about the cluster. In our research, we used the Dartmouth Stellar Evolution Program, and the PAdova and TRieste Stellar Evolution Code to determine the age, distance and reddening of two globular clusters, M13 and M80, using photometry from the Hubble Space Telescope’s Wide Field Camera 3 and Advanced Camera for Surveys. In addition to finding these parameters, we also looked at how the two models compare to one another, and where they seem to have problems. We found that both models have systematic inaccuracies in the ultraviolet (UV) bands, and in particular that PARSEC predicts stellar metallicities that are too high in the UV.

Faculty Sponsor

Nathaniel Paust

Tracks

Heavens and Earth

Terms of Use

ARMINDA Terms of Use

Location

Science 159

Presentation Type

Oral Presentation

Research Funding Source or OCS Program

Washington NASA Space Grant Consortium

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Isochrone Fitting of Hubble Data in UV-Vis-IR Bands

Science 159

Stellar evolution models are an important tool used by astronomers to study star clusters. By plotting stars within a cluster in terms of their color and magnitude, we can fit these highly complex theoretical models to the data and determine important information about the cluster. In our research, we used the Dartmouth Stellar Evolution Program, and the PAdova and TRieste Stellar Evolution Code to determine the age, distance and reddening of two globular clusters, M13 and M80, using photometry from the Hubble Space Telescope’s Wide Field Camera 3 and Advanced Camera for Surveys. In addition to finding these parameters, we also looked at how the two models compare to one another, and where they seem to have problems. We found that both models have systematic inaccuracies in the ultraviolet (UV) bands, and in particular that PARSEC predicts stellar metallicities that are too high in the UV.

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