Abundances of 23 field RR Lyrae stars
文献类型：期刊论文
| 作者 | Liu, Shu1,2 ; Zhao, Gang1; Chen, Yu-Qin1; Takeda, Yoichi3; Honda, Satoshi4; Chen Yuqin; Gang Zhao; Shu Liu
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2013-11-01 |
| 卷号 | 13期号:11页码:1307-1329 |
| 关键词 | techniques: spectroscopic stars: abundances stars: variables: RR Lyrae |
| 英文摘要 | We present stellar parameters and abundances of 15 elements (Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni, Cu, Y and Ba) for 23 field RR Lyrae variables based on high-resolution (R similar to 60 000) and high signal-to-noise (S/N similar to 2 0 0) spectra obtained using the High Dispersion Spectrograph on the Subaru Telescope. Six stars in the sample have more than one spectrum observed at different pulsation phases. The derived abundance ratios of [X/Fe] for 14 elements (except for Ba) do not vary during the pulsation cycle. An interesting curve of [Ba/Fe] versus phase is detected for the first time and it shows decreasing [Ba/Fe] with increasing temperature at a given metallicity. Combining with data in the literature, abundances of most RR Lyrae stars as a function of [Fe/H] follow the same trends as those of dwarf stars, but [Sc/Fe] and [Y/Fe] ratios of RR Lyrae stars at solar metallicity are lower than those of dwarf stars. The kinematics of RR Lyrae stars indicate that three comparatively metal-rich RR Lyrae stars might originate from the thick disk and they show higher [alpha/Fe] ratios than RR Lyrae stars with thin disk kinematics. Among 23 RR Lyrae stars, two special objects are found with abnormal abundances; TV Lib has high [alpha/Fe], [Sc/Fe], [Y/Fe] and [Ba/Fe] ratios while TW Her has solar [alpha/Fe] but significantly lower [Sc/Fe], [Y/Fe] and [Ba/Fe] ratios as compared with other RR Lyrae stars. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000326281500003 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5831]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan 4.Univ Hyogo, Ctr Astron, Nishi Harima Astron Observ, Sayo, Hyogo 6795313, Japan |
| 推荐引用方式 GB/T 7714 | Liu, Shu,Zhao, Gang,Chen, Yu-Qin,et al. Abundances of 23 field RR Lyrae stars[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(11):1307-1329. |
| APA | Liu, Shu.,Zhao, Gang.,Chen, Yu-Qin.,Takeda, Yoichi.,Honda, Satoshi.,...&Shu Liu.(2013).Abundances of 23 field RR Lyrae stars.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(11),1307-1329. |
| MLA | Liu, Shu,et al."Abundances of 23 field RR Lyrae stars".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.11(2013):1307-1329. |
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来源：国家天文台
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