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THE OBSERVABILITY OF ABUNDANCE RATIO EFFECTS IN DYNAMICALLY HOT STELLAR SYSTEMS

机译:动态恒星系统中丰度比效应的可观测性

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摘要

Using synthetic spectra, we construct a simple model of an elliptical galaxy with a velocity dispersion σ = 200 km s~(-1). Absorption feature indices are defined that are sensitive to the abundances of C, N, O, Na, Mg, Al, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Ba, and Eu as a first step in determining the abundances of these elements in stellar populations such as elliptical galaxies for which integrated spectra are available. Using these indices and assuming a photon statistical error such that S/N = 100 around 5000 A, the feasibility of measuring individual elements in real galaxies is assessed. Of the elements studied, only S, K, Cu, Zn, and Eu appear to be difficult to determine. The rest appear to be measurable with high-quality data and models. The effects of abundance changes on Lick IDS indices, Rose indices, and BRVI colors are also tabulated.
机译:利用合成光谱,我们构造了一个简单的椭圆星系模型,其速度色散为σ= 200 km s〜(-1)。定义了对C,N,O,Na,Mg,Al,Si,S,K,Ca,Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu, Zn,Sr,Ba和Eu的第一步是确定恒星种群(例如,具有积分光谱的椭圆星系)中这些元素的丰度。使用这些指数并假设一个光子统计误差(例如,S / N = 100约为5000 A),评估了在实际星系中测量单个元素的可行性。在所研究的元素中,只有S,K,Cu,Zn和Eu似乎难以确定。其余的似乎可以通过高质量的数据和模型进行测量。还列出了丰度变化对Lick IDS指数,Rose指数和BRVI颜色的影响。

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