The Spectroscopic and Photometric Study of a Star Cluster Sample in Andromeda Halo

TL;DR

This study combines spectroscopic and photometric data to derive physical parameters for 29 Andromeda halo star clusters, providing new insights into their ages and metallicities, with three clusters analyzed for the first time using this combined approach.

Contribution

It presents the first combined photometric and spectroscopic analysis for three M31 halo star clusters, enhancing understanding of their properties.

Findings

Good agreement with literature values for derived parameters.

Identification of three clusters analyzed with combined methods for the first time.

Comprehensive dataset from multiple surveys improves parameter accuracy.

Abstract

Halo star clusters serve as vital tracers for the formation and evolution of the Andromeda galaxy. In this work, we present physical parameters for 29 M31 halo star clusters, derived from a combination of spectroscopic and photometric data. Low-resolution spectra were acquired using the BFOSC spectrograph on the NAOC Xinglong 2.16-m telescope. For the photometric analysis, we utilized uSC and vSAGE bands from the SAGE survey, complemented by archival data from GALEX(NUV, FUV), PAN-STARRS(grizy) and the 2MASS(JHK). Ages and metallicities were determined via ULySS (Vazdekis et al. and pegase-hr) SSP model and the Bruzual & Charlot (2003) (BC03) stellar population synthesis models. The derived parameters show good agreement with literature values. Notably, for three of these clusters, this study represents the first combined photometric and spectroscopic analysis.