首页> 外文期刊>The Astrophysical journal >PHOTOSPHERIC METALS IN THE FAR ULTRAVIOLET SPECTROSCOPIC EXPLORER SPECTRUM OF THE SUBDWARF B STAR PG 0749+658
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PHOTOSPHERIC METALS IN THE FAR ULTRAVIOLET SPECTROSCOPIC EXPLORER SPECTRUM OF THE SUBDWARF B STAR PG 0749+658

机译:SUBBWARF B STAR PG 0749 + 658的远紫外光谱探测器光谱中的光球金属

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摘要

We present an abundance analysis of the far-ultraviolet (905-1187 A) spectrum of the subdwarf B star PG 0749+658 obtained by the Far Ultraviolet Spectroscopic Explorer. The data have a resolution of about R = λ/Δλ = 12000-15000 A (20-25 km s~(-1)). We determine C, N, Si, P, S, Cr, Mn, Fe, Co, and Ni abundances, and upper limits on the abundance of Cl and V, using a grid of synthetic spectra based on an LTE stellar atmosphere model. He, C, N, Si, and Cl are depleted by a factor of approx>10 with respect to the solar abundance, while P, S, and Fe are diminished by less than a factor of 10. We measure a solar abundance of Cr, Mn, and Co and a Ni enhancement of ~0.6 dex. We compare these values with predictions based on radiative levitation theory.
机译:我们介绍了由远紫外光谱浏览器获得的近矮B星PG 0749 + 658的远紫外光谱(905-1187 A)的丰度分析。数据的分辨率约为R =λ/Δλ= 12000-15000 A(20-25 km s〜(-1))。我们使用基于LTE恒星大气模型的合成光谱网格,确定C,N,Si,P,S,Cr,Mn,Fe,Co和Ni的丰度以及Cl和V的丰度上限。相对于太阳丰度,He,C,N,Si和Cl减少了大约10倍,而P,S和Fe减少了不足10倍。我们测量了Cr的太阳丰度,Mn和Co以及Ni的增加量约为0.6 dex。我们将这些值与基于辐射悬浮理论的预测进行比较。

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