КФУ. Карточка публикации. Horizontal branch structure, age, and chemical composition for very metal-poor extragalactic globular clusters

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HORIZONTAL BRANCH STRUCTURE, AGE, AND CHEMICAL COMPOSITION FOR VERY METAL-POOR EXTRAGALACTIC GLOBULAR CLUSTERS

Форма представления

Статьи в зарубежных журналах и сборниках

Год публикации

2024

Язык

английский

Авторы, сотрудники КФУ

Шиманский Владислав Владимирович, автор

Библиографическое описание на языке оригинала

Sharina, M.E.Horizontal branch structure, age, and chemical composition for very metal-poor extragalactic globular clusters /Text/ M.E. Sharina, M. I. Maricheva, A.Y. Kniazev, V.V. Shimansky, I.A. Acharova // Monthly Notices of the Royal Astronomical Society. - 2024. - V.528, - P.7165-7185.

Аннотация

This paper presents the results of analysing the integrated light (IL) low-resolution spectra of globular clusters (GCs) in the M31 and Centaurus A groups of galaxies. The sample consists of eight very metal-poor GCs ([Fe/H]≤−2 dex) with high signal-to-noise ratio spectra acquired with the telescopes: the 6-m SAO RAS (BTA), the Southern African Large (SALT), and the 6.5-m Magellan (MMT). We study the influence of contribution of the horizontal branch stars on the hydrogen Balmer line profiles in the IL spectra. By modelling the Balmer lines, as well as the metal lines in the observed spectra, we determine the optimum parameters of stellar evolution isochrones and, consequently, the parameters of the atmospheres of the cluster stars. For all the studied GCs, the parameters of horizontal branch stars set by the selected isochrones, the corresponding ages, and carbon abundances are presented for the first time. The abundances of several other elements (Mg, Ca, Ti, Cr, and Mn) were determined for five GCs for the first time. All the studied GCs have blue horizontal branches and are older than 10 Gyr. Their chemical abundances, with the exception of Mg and Mn, are in good agreement with the abundances of stars in the Galactic field. The reasons of low [Mg/Fe] and of high [Mn/Fe] are discussed. Study of the fundamental properties of stellar populations in old GCs facilitates a better understanding of the formation processes of their parent galaxies and nucleosynthesis in the early Universe.

Ключевые слова

galaxies: abundances; galaxies: dwarf; galaxies: individual: M31; M33; NGC205; NGC147; [KK98a]197; galaxies: star clusters: general; galaxies: star clusters: individual: [VFH2013] PA-N147-1; [H76b] 3; [CS82] C39; [H32] VIII; Bol 2; [H32] 74; EXT 8; [GPH2009] KK 197-2

Название журнала

Monthly Notices of the Royal Astronomical Society

URL

https://academic.oup.com/mnras/article/528/4/7165/7604622

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Полная запись метаданных

Поле DC	Значение	Язык
dc.contributor.author	Шиманский Владислав Владимирович	ru_RU
dc.date.accessioned	2024-01-01T00:00:00Z	ru_RU
dc.date.available	2024-01-01T00:00:00Z	ru_RU
dc.date.issued	2024	ru_RU
dc.identifier.citation	Sharina, M.E.Horizontal branch structure, age, and chemical composition for very metal-poor extragalactic globular clusters /Text/ M.E. Sharina, M. I. Maricheva, A.Y. Kniazev, V.V. Shimansky, I.A. Acharova // Monthly Notices of the Royal Astronomical Society. - 2024. - V.528, - P.7165-7185.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/?p_id=299807	ru_RU
dc.description.abstract	Monthly Notices of the Royal Astronomical Society	ru_RU
dc.description.abstract	This paper presents the results of analysing the integrated light (IL) low-resolution spectra of globular clusters (GCs) in the M31 and Centaurus A groups of galaxies. The sample consists of eight very metal-poor GCs ([Fe/H]≤−2 dex) with high signal-to-noise ratio spectra acquired with the telescopes: the 6-m SAO RAS (BTA), the Southern African Large (SALT), and the 6.5-m Magellan (MMT). We study the influence of contribution of the horizontal branch stars on the hydrogen Balmer line profiles in the IL spectra. By modelling the Balmer lines, as well as the metal lines in the observed spectra, we determine the optimum parameters of stellar evolution isochrones and, consequently, the parameters of the atmospheres of the cluster stars. For all the studied GCs, the parameters of horizontal branch stars set by the selected isochrones, the corresponding ages, and carbon abundances are presented for the first time. The abundances of several other elements (Mg, Ca, Ti, Cr, and Mn) were determined for five GCs for the first time. All the studied GCs have blue horizontal branches and are older than 10 Gyr. Their chemical abundances, with the exception of Mg and Mn, are in good agreement with the abundances of stars in the Galactic field. The reasons of low [Mg/Fe] and of high [Mn/Fe] are discussed. Study of the fundamental properties of stellar populations in old GCs facilitates a better understanding of the formation processes of their parent galaxies and nucleosynthesis in the early Universe.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject		ru_RU
dc.title	Horizontal branch structure, age, and chemical composition for very metal-poor extragalactic globular clusters	ru_RU
dc.type	Статьи в зарубежных журналах и сборниках	ru_RU