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Modeling and analysis of medium-resolution integrated-light spectra of globular clusters in dwarf galaxies

Published online by Cambridge University Press:  11 March 2020

Margarita E. Sharina Open the ORCID record for Margarita E. Sharina [Opens in a new window]  and
Vladislav V. Shimansky
Margarita E. Sharina
Affiliation:
Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, 369167, Russia email: sme@sao.ru
Vladislav V. Shimansky
Affiliation:
Kazan Federal University, 18 Kremlyovskaya street, Kazan, 420008, Russia email: Slava.Shimansky@kpfu.ru
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Abstract

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The study of ages, helium mass fraction (Y) and chemical composition of globular clusters in dwarf galaxies is important for understanding the physical conditions at the main evolutionary stages of the host galaxies and for constraining the build-up histories of large galaxies. We present the analysis of integrated-light spectra of 8 extragalactic and 20 Galactic globular clusters (GCs) using our population synthesis method. We calculate synthetic spectra of GCs according to the defined stellar mass functions using model atmospheres and stellar parameters ([Fe/H], Teff, and logg) set by theoretical isochrones. The main advantage of our method is the ability to determine not only chemical composition but also the age and mean Y in a cluster by modelling and analysis of Balmer absorption lines. The knowledge of Y and anomalies of light elements in star clusters is one of the key points for understanding the phenomenon of multiple stellar populations.

Keywords

galaxies: individual (M31, M33, NGC147, KKs3, ESO269-66)galaxies: star clusters: individual (CBF98, CBF28, MayallII, MGC1, Bol298, KKs3 - GC1, ESO269-66 - GC1, SD09 - GC7)galaxies: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 165 - 169
Copyright
© International Astronomical Union 2020

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