Period-Luminosity Relations for Small Magellanic Cloud Cepheid Based on AKARI Archival Data

TL;DR

This paper derives mid-infrared period-luminosity relations for Small Magellanic Cloud Cepheids using AKARI and OGLE-III data, providing new calibrations in N3 and N4 bands despite sample size limitations.

Contribution

It presents the first mid-infrared PL relations for SMC Cepheids based on AKARI archival data, including random-phase corrections.

Findings

Derived PL relations in N3 and N4 bands.

Included random-phase correction in the analysis.

Results may be biased due to small sample size.

Abstract

In this work we matched the AKARI archival data to the Optical Gravitational Lensing Experiment-III (OGLE-III) catalog to derive the mid-infrared period luminosity (PL) relations for Small Magellanic Cloud (SMC) Cepheids. Mismatched AKARI sources were eliminated using random-phase colors obtained from the full I-band light curves from OGLE-III. It was possible to derive PL relations in the N3 and N4 bands only, although the S7, S11, L15, and L24 band data were also tested. Random-phase correction was included when deriving the PL relation in the N3 and N4 bands using the available time of observations from AKARI data. The final adopted PL relations were: N3 = -3.370 logP + 16.527 and N4 = -3.402 logP + 16.556. However, these PL relations may be biased due to the small number of Cepheids in the sample.