Oxygen, α-element and iron abundance distributions in the inner part of the Galactic thin disc - II

被引：24

作者：

Andrievsky, S. M. ^{[1
,2
,3
,4
]}

Martin, R. P. ^{[5
]}

Kovtyukh, V. V. ^{[1
,2
,3
]}

Korotin, S. A. ^{[1
,2
,3
]}

Lepine, J. R. D. ^{[6
]}

机构：

[1] Odessa Natl Univ, Dept Astron, Shevchenko Pk, UA-65014 Odessa, Ukraine

[2] Odessa Natl Univ, Astron Observ, Shevchenko Pk, UA-65014 Odessa, Ukraine

[3] Isaac Newton Inst Chile, Odessa Branch, Shevchenko Pk, UA-65014 Odessa, Ukraine

[4] Univ Paris Diderot, CNRS, GEPI, Observ Paris Meudon, F-92125 Meudon, France

[5] Univ Hawaii, Dept Phys & Astron, Hilo, HI 96720 USA

[6] Univ Sao Paulo, Dept Astron, IAG USP, Rua Matao 1226,Cidade Univ, BR-05508900 Sao Paulo, SP, Brazil

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 461卷 / 04期

关键词：

stars: abundances; Galaxy: evolution; CHEMICAL EVOLUTION; CEPHEIDS; GALAXIES; BARIUM; STARS; MODEL; LINE;

D O I：

10.1093/mnras/stw1631

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have derived the abundances of 36 chemical elements in one Cepheid star, ASAS 181024-2049.6, located R-G = 2.53 kpc from the Galactic Centre. This star falls within a region of the inner thin disc poorly sampled in Cepheids. Our spectral analysis shows that iron, magnesium, silicon, calcium and titanium local thermodynamic equilibrium abundances in that star support the presence of a plateau-like abundance distribution in the thin disc within 5 kpc of theGalactic Centre, as previously suggested by Martin et al. If confirmed, the flattening of the abundance gradient within that region could be the result of a decrease in the star formation rate due to dynamic effects, possibly from the central Galactic bar.

引用

页码：4256 / 4259

页数：4

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