Large Magellanic Cloud Near-Infrared Synoptic Survey. V. Period-Luminosity Relations of Miras

TL;DR

This study analyzes near-infrared properties of 690 Mira variable stars in the Large Magellanic Cloud, deriving precise Period-Luminosity relations and examining reddening effects for different Mira types.

Contribution

It provides new near-infrared Period-Luminosity relations for Miras in the LMC with low scatter and investigates reddening laws for Carbon-rich Miras.

Findings

Low scatter (0.12 mag) in Period-Luminosity relation at Ks for Oxygen-rich Miras.

Evidence of different reddening laws for Carbon-rich Miras.

Robust mean magnitudes derived from densely-sampled light curves.

Abstract

We study the near-infrared properties of 690 Mira candidates in the central region of the Large Magellanic Cloud, based on time-series observations at JHKs. We use densely-sampled I-band observations from the OGLE project to generate template light curves in the near infrared and derive robust mean magnitudes at those wavelengths. We obtain near-infrared Period-Luminosity relations for Oxygen-rich Miras with a scatter as low as 0.12 mag at Ks. We study the Period-Luminosity-Color relations and the color excesses of Carbon-rich Miras, which show evidence for a substantially different reddening law.