Luminosity-Colour Relations for Red Clump Stars

TL;DR

This study calibrates the absolute magnitudes of red clump stars across multiple bands based on their colours, providing a useful tool for distance estimation and Galactic structure studies.

Contribution

It introduces new calibrations of red clump star magnitudes in various bands as functions of colour, tested on field stars and consistent with previous Galactic models.

Findings

Strong colour dependence for $M_V$ and $M_g$ magnitudes.

Weak colour dependence for $M_J$ and $M_{K_s}$ magnitudes.

Galactic model parameters align with earlier research.

Abstract

We calibrated the $M_V$, $M_J$, $M_{K_s}$ and $M_g$ absolute magnitudes of red clump stars in terms of colours. $M_V$ and $M_g$ are strongly dependent on colour, while the dependence of $M_J$ and $M_{K_s}$ on colour is rather weak. The calibration of $M_V$ and $M_{K_s}$ absolute magnitudes is tested on 101 RC stars in the field SA 141. The Galactic model parameters estimated with this sample are in good agreement with earlier studies.