期刊
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
卷 45, 期 5, 页码 259-275出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1063773719050050
关键词
stars; galaxies
资金
- Presidium of the Russian Academy of Sciences [12]
- RSF [17-13-01144]
- Russian Science Foundation [17-13-01144] Funding Source: Russian Science Foundation
For three stars in the ultra-faint dwarf (UFD) galaxy Bootes I we have determined the atmospheric parameters, performed a new reduction of high-resolution spectra from the Subaru archive, and derived the abundances of eight chemical elements without using the LTE assumption. As a result, among the galaxies of its class Bootes I now has the largest sample of stars (11) with a homogeneous set of atmospheric parameters and chemical abundances, and this makes it the most promising for studying the chemical evolution of UFD galaxies. We show that in the range -3 less than or similar to [Fe/H] less than or similar to -2 for each of the three -process elements, magnesium, calcium, and titanium, a transition from their overabundance relative to iron with [/Fe] approximate to 0.3 to the solar [/Fe] ratio occurs. This most likely suggests the commenced production of iron in type Ia supernovae. The behavior of the carbon, sodium, nickel, and barium abundances does not differ from that in more massive galaxies, our Galaxy and classical dwarf spheroidal galaxies.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据