论文标题
Lamost J045019.27+394758.7，具有N，Na，V，Zn的特殊丰度
LAMOST J045019.27+394758.7, with peculiar abundances of N, Na, V, Zn, is possibly a Sculptor dwarf galaxy escapee
论文作者
论文摘要
我们从Lamost DR2的碳星列表中介绍了Star LamostJ045019.27+394758.7（以下简称J045）的高分辨率（r $ \ sim $ 60,000）光谱分析的结果。从我们的分析中，我们发现J045没有表现出碳星的光谱特性。发现它是一种金属贫困（[fe/h] = $ - $ 1.05）的巨人，显示出非常不寻常的元素丰度，尤其是对于N，NA，V和Zn。 J045显示$α$ - 元素（MG，SI，CA），其值（$ <$ <$ [$ [$α$/fe] $> $ = 0.09），与在0.2至0.3 dex范围内显示[$α$/fe]的银河恒星相反。在J045中，SC和TI富含[x/fe] $ \ le $ $ - $ 0.25。钒给出[v/fe] = 0.51，锌不丰富，[Zn/fe] = $ - $ 0.62。该物体显示出Sr，Y，BA，PR和SM的近极丰度。 LA的增强略有增强，在J045中，CE和ND少丰富。使用[BA/EU] = $ - $ 0.38，该对象属于中子捕获富的R-I星的类别。各种元素的估计丰度表明，观察到的丰度模式与银河金属贫困星的丰度不兼容，但与类似金属性的雕塑家矮星星星的丰度模式非常紧密地匹配。基于上述观察证据，我们建议该物体是可能的雕塑家矮人的埃斯eScapee。
We present the results of the high-resolution (R$\sim$60,000) spectroscopic analysis of the star LAMOSTJ045019.27+394758.7 (hereafter J045) from the list of carbon stars of LAMOST DR2. From our analysis, we find that J045 does not exhibit the spectral characteristics of carbon stars. It is found to be a metal-poor ( [Fe/H] = $-$1.05) giant that shows very unusual elemental abundances, particularly for N, Na, V, and Zn. J045 shows $α$-elements (Mg, Si, Ca) with near-solar values ($<$[$α$/Fe]$>$ = 0.09) in contrast to Galactic stars that show [$α$/Fe] in the range 0.2 to 0.3 dex. In J045, Sc and Ti are under abundant with [X/Fe] $\le$ $-$0.25. Vanadium gives [V/Fe] = 0.51 and zinc is under-abundant with [Zn/Fe] = $-$0.62. The object exhibits near-solar abundances for Sr, Y, Ba, Pr, and Sm. The La is marginally enhanced, and Ce and Nd are marginally under-abundant in J045. With [Ba/Eu] = $-$0.38, the object falls into the category of neutron-capture rich r-I stars. The estimated abundances of various elements show that the observed abundance pattern is not compatible with the abundances characteristic of Galactic metal-poor stars but matches quite closely with the abundance pattern of Sculptor Dwarf galaxy stars of similar metallicity. Based on the above observational evidences, we suggest that the object is a possible Sculptor Dwarf Galaxy escapee.
