Study of Integrated Spectra of Four Globular Clusters in M31
arXiv:2110.10502 · doi:10.1134/S199034132104009X
Abstract
The results of determining the metallicity, age, helium mass fraction (Y) and abundances of the elements C, N, Mg, Ca, Mn, Ti and Cr by moderate resolution spectra for four globular clusters in the galaxy M 31: Bol 6, Bol 20, Bol 45 and Bol 50 are presented. The chemical composition for Bol 20 and Bol 50, and Y for four clusters are determined for the first time. The spectra of the studied objects were obtained with the 6-meter telescope of the SAO RAS in 2020. All the clusters under study turned out to be older than 11 Gyrs. The determined metallicities [Fe/H] are in the range from -1.1 to -0.75 dex. They are lower than the metallicity of stars of the M 31 halo at a given distance from the galactic center (R_M31 < 10 kpc). The abundances of the elements of the alpha-process [alpha/Fe] = ([O/Fe] + [Mg/Fe] + [Ca/Fe])/3 of the four clusters correspond to those of the stars of the inner halo of M31.
arXiv comment21 pages, 15 figures, 6 tables accepted to Astrophysical Bulletin
References in corpus (39)
- Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
- The chemical composition of the Sun
- A 2.4% Determination of the Local Value of the Hubble Constant
- The observed properties of dwarf galaxies in and around the Local Group
- A large stellar evolution database for population synthesis studies. I. Scaled solar models and isochrones
- Galactic chemical evolution: Carbon through Zinc
- ULySS: A Full Spectrum Fitting Package
- Scaled solar tracks and isochrones in a large region of the Z-Y plane I. From the ZAMS to the TP-AGB end for 0.15 - 2.5 Mo stars
- The SCORPIO focal reducer
- Hectospec, the MMT's 300 Optical Fiber-Fed Spectrograph
- The initial mass function : from Salpeter 1955 to 2005
- 2MASS NIR photometry for 693 candidate globular clusters in M31 and the Revised Bologna Catalogue
- On the Continuing Formation of the Andromeda Galaxy: Detection of HI Clouds in the M31 Halo
- Spectroscopic ages and metallicities of stellar populations: validation of full spectrum fitting
- The large-scale structure of the halo of the Andromeda galaxy II. Hierarchical structure in the Pan-Andromeda Archaeological Survey
- Star Clusters in M31: II. Old Cluster Metallicities and Ages from Hectospec Data
- A Library of Integrated Spectra of Galactic Globular Clusters
- Star Clusters in M31: I. A Catalog and a Study of the Young Clusters
- Structural parameters for globular clusters in M31 and generalizations for the fundamental plane
- HST/WFPC2 Color-Magnitude Diagrams for Globular Clusters in M31
- Local Group Dwarf Elliptical Galaxies: I. Mapping the Dynamics of NGC 205 Beyond the Tidal Radius
- The Detailed Chemical Properties of M31 Star Clusters I. Fe, Alpha and Light Elements
- Star Clusters in M31: VII. Global Kinematics and Metallicity Subpopulations of the Globular Clusters
- The Evolved Stellar Content of NGC 147, NGC 185, and NGC 205
- Ages, Metallicities, and [alpha/Fe] ratios of globular clusters in NGC 147, NGC 185, and NGC 205
- The Asymptotic Giant Branch of NGC 205: The Characteristics of Carbon Stars and M Giants Identified from JHK' Images
- Two major accretion epochs in M31 from two distinct populations of globular clusters
- Infrared High-Resolution Integrated Light Spectral Analyses of M31 Globular Clusters from APOGEE
- Full spectral fitting of Milky Way and M31 globular clusters: ages and metallicities
- Globular Cluster Abundances from High-Resolution, Integrated-Light Spectroscopy. II. Expanding the Metallicity Range for Old Clusters and Updated Analysis Techniques
- Detailed abundances from integrated-light spectroscopy: Milky Way globular clusters
- The horizontal branch luminosity vs metallicity in M31 globular clusters
- Optimal Integrated Abundances for Chemical Tagging of Extragalactic Globular Clusters
- Elemental Abundances in M31: Iron and Alpha Element Abundances in M31's Outer Halo
- Estimating ages and metallicities of M31 star clusters from LAMOST DR6
- Modeling and Analysis of a Spectrum of the Globular Cluster NGC 2419
- Globular Clusters in the Outer Halo of M31
- Lick Indices and Spectral Energy Distribution Analysis based on an M31 Star Cluster Sample: Comparisons of Methods and Models
- Analysis of integrated-light spectra of Galactic globular clusters