The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies-VIII. A Census of Long-Period Variable Stars across the Andromeda Dwarf Satellite System

TL;DR

This paper presents a detailed catalog of long-period variable stars in 17 Andromeda dwarf satellites, based on photometric data from the Isaac Newton Telescope, providing valuable resources for studying dwarf galaxy evolution.

Contribution

It offers the first comprehensive catalog of LPV stars in Andromeda dwarf satellites, including new structural parameters and distance measurements, with publicly available data for further research.

Findings

Identified approximately 2800 LPV candidates across 17 satellites.

Derived updated structural parameters and half-light radii.

Measured distance moduli using TRGB method with Sobel-filter detection.

Abstract

We present a comprehensive catalog, in the Sloan $i$ and Harris $V$ filters, of long-period variable (LPV) stars in the spheroidal dwarf satellites of the Andromeda galaxy, based on a dedicated survey for variable stars in Local Group dwarf systems. Using photometric time-series data obtained with the Wide Field Camera (WFC) on the 2.5 m Isaac Newton Telescope (INT), we identify approximately 2800 LPV candidates across 17 Andromeda satellites, spanning a broad range in luminosity and variability amplitude. This study is accompanied by a public data release that includes two comprehensive catalogs, a catalog of the complete stellar populations for each galaxy and a separate catalog listing all identified LPV candidates. Both are available through CDS/VizieR and provide a valuable resource for investigating quenching timescales, stellar mass distributions, and the effects of mass-loss and dust production in dwarf galaxies. We derive updated structural parameters, including newly measured half-light radii, and determine distance moduli using the Tip of the Red Giant Branch (TRGB) method with Sobel-filter edge detection, yielding values between $23.38\pm0.06$ and $25.35\pm0.06$ mag.