Period-Luminosity Relations Derived from the OGLE-III Fundamental Mode Cepheids

TL;DR

This paper derives and analyzes period-luminosity relations for Cepheids in the Large Magellanic Cloud using OGLE-III data, revealing non-linearity in some bands and linearity in others, with implications for distance measurements.

Contribution

The study provides new P-L relations across multiple bands for LMC Cepheids and tests their linearity, enhancing the understanding of Cepheid variables.

Findings

P-L relations are non-linear in VIJH bands.

P-L relations are linear in K and IRAC bands.

Extinction correction is applied to improve accuracy.

Abstract

In this Paper, we have derived Cepheid period-luminosity (P-L) relations for the Large Magellanic Cloud (LMC) fundamental mode Cepheids, based on the data released from OGLE-III. We have applied an extinction map to correct for the extinction of these Cepheids. In addition to the VIW band P-L relations, we also include JHK and four Spitzer IRAC band P-L relations, derived by matching the OGLE-III Cepheids to the 2MASS and SAGE datasets, respectively. We also test the non-linearity of the Cepheid P-L relations based on extinction-corrected data. Our results (again) show that the LMC P-L relations are non-linear in VIJH bands and linear in KW and the four IRAC bands, respectively.