# Observations of Field and Cluster RR Lyrae with Spitzer. Towards High Precision Distances with Population II Stellar Tracers

## TL;DR

This paper discusses calibrating RR Lyrae stars' period-luminosity-metallicity relation using Spitzer observations to improve distance measurements with Population II stellar tracers.

## Contribution

It introduces a new calibration of RR Lyrae stars' relation using high-precision infrared data from Spitzer, enhancing distance measurement accuracy.

## Key findings

- Calibrated RR Lyrae period-luminosity-metallicity relation.
- Improved distance estimates to Galactic halo and globular clusters.
- Enhanced understanding of Population II stellar tracers.

## Abstract

We present our project to calibrate the RR Lyrae period-luminosity-metallicity relation using a sample of Galactic calibrators in the halo and globular clusters.