Empirical temperature- and extinction-dependent extinction coefficients for the GALEX, Pan-STARRS1, Gaia, SDSS, 2MASS, and WISE passbands

TL;DR

This study empirically derives temperature- and extinction-dependent extinction coefficients across multiple photometric passbands using a large stellar sample, improving reddening correction accuracy in astrophysical observations.

Contribution

It provides the first comprehensive empirical reddening and extinction coefficients as functions of Teff and E(B-V) for multiple passbands, validated against models and literature.

Findings

Coefficients are valid for 4000-10000 K and 0-0.5 mag extinction range.

The new coefficients explain discrepancies in previous measurements.

A Python package is provided for applying these coefficients.

Abstract

We have obtained accurate dust reddening from far-ultraviolet (UV) to the mid-infrared (IR) for up to 5 million stars by the star-pair algorithm based on LAMOST stellar parameters along with GALEX, Pan-STARRS 1, Gaia, SDSS, 2MASS, and WISE photometric data. The typical errors are between 0.01-0.03 mag for most colors. We derived the empirical reddening coefficients for 21 colors both in the traditional (single valued) way and as a function of Teff and E(B-V) by using the largest samples of accurate reddening measurements, together with the extinction values from Schlegel et al. The corresponding extinction coefficients have also been obtained. The results are compared with model predictions and generally in good agreement. Comparisons with measurements in the literature show that the Teff- and E(B-V)-dependent coefficients explain the discrepancies between different measurements naturally, i.e., using sample stars of different temperatures and reddening. Our coefficients are mostly valid in the extinction range of 0-0.5 mag and the temperature range of 4000-10000 K. We recommend that the new Teff and E(B-V) dependent reddening and extinction coefficients should be used in the future. A Python package is also provided for the usage of the coefficient