NIR filter transformations across the HR diagram: JWST, Roman, and Euclid

TL;DR

This paper develops new near-infrared filter transformations across multiple space telescopes and ground-based systems, enabling accurate color predictions and comparisons for various stellar populations and observational data.

Contribution

It introduces comprehensive color transformations for 105 filter combinations across JWST, Euclid, Roman, HST, and ground-based systems, and applies them to stellar color-magnitude relations.

Findings

Transformations have residuals of about 0.01 mag for standard stars.

Predicted color-magnitude relations agree with empirical data for JWST.

Residuals can be up to 0.1 mag for certain evolved stars.

Abstract

We present new color transformations between select near-infrared filters on JWST/NIRCam, Euclid/NISP, Roman/WFI, HST, and ground-based $izY+IJHK_S$, for a total of 105 unique filter combinations. Additionally, we apply these transformations to predict the color-magnitude relation of the tip of the red giant branch as seen with JWST, Euclid, and Roman based on theoretical results for HST and 2MASS filters; for JWST we find good agreement with empirical results in the literature. We also find typical residual dispersion around these transformations of 0.01 mag for Cepheid and RR Lyrae variables and RGB stars, but up to 0.1 mag for O- and C-rich TP-AGB stars.