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arXiv 1704.08282astro-ph.SR
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FGK星的磷丰度

Phosphorus Abundances in FGK Stars

Z. G. Maas, C. A. Pilachowski, G. Cescutti

摘要:

我们测量了22个FGK矮星和巨星的磷丰度,跨度为-0.55 $<$ [Fe/H] $<$ 0.2,使用的光谱是用凤凰高分辨率红外光谱仪在基特峰国家天文台的Mayall 4米望远镜,双子座南望远镜和大角星光谱图集。我们将合成光谱与10581 $Å$处的PI特征拟合以确定我们样品的丰度。我们的研究结果与以前测量的磷丰度一致;与其他红外磷研究的平均值相比,我们的恒星在0.2 dex的[Fe/H]箱中测量的平均[P/Fe]比在$\sim$ 1 $σ$范围内。我们的研究提供了更多的证据表明,使用理论产率的结果的化学演化模型下生产磷相比,观察到的丰度。我们的数据更好地拟合化学演化模型与磷产量增加了2.75的因素相比,未经调整的产量模型。我们还发现,对于我们的样品,平均[P/Si] = 0.02 $\pm$ 0.07和[P/S] = 0.15 $\pm$ 0.15,表明[P/Si]和[P/S]比与日光比没有显著偏差。

英文摘要:

We measured phosphorus abundances in 22 FGK dwarfs and giants that span --0.55 $<$ [Fe/H] $<$ 0.2 using spectra obtained with the Phoenix high resolution infrared spectrometer on the Kitt Peak National Observatory Mayall 4m telescope, the Gemini South Telescope, and the Arcturus spectral atlas. We fit synthetic spectra to the P I feature at 10581 $Å$ to determine abundances for our sample. Our results are consistent with previously measured phosphorus abundances; the average [P/Fe] ratio measured in [Fe/H] bins of 0.2 dex for our stars are within $\sim$ 1 $σ$ compared to averages from other IR phosphorus studies. Our study provides more evidence that models of chemical evolution using the results of theoretical yields are under producing phosphorus compared to the observed abundances. Our data better fit a chemical evolution model with phosphorus yields increased by a factor of 2.75 compared to models with unadjusted yields. We also found average [P/Si] = 0.02 $\pm$ 0.07 and [P/S] = 0.15 $\pm$ 0.15 for our sample, showing no significant deviations from the solar ratios for [P/Si] and [P/S] ratios.

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