Using LPVs as Tracers of Stellar Populations -- Using the Fuel Consumption Theorem

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Using our multi-year observing campaign of northern dwarf irregular galaxies of the Local Group, we assembled a sample of long-period pulsating variable stars in these galaxies. Based on the long baseline of continuous observations in R and thorough completeness simulations, this sample can be considered complete. To draw conclusions on the star formation history in these systems, a comparison of the color-magnitude diagrams with the location of different isochrones alone fails due to an age-metallicity degeneracy. Using the Leo A dwarf galaxy as an example, we show how the fuel consumption theorem can be used to break this degeneracy.

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