Are beryllium abundances anomalous in stars with giant planets
Are beryllium abundances anomalous in stars with giant planets
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DOI：
10.1051/0004-6361:20040509
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发表时间：
2004-08
影响因子：
6.5
通讯作者：
N. Santos;G. Israelian;R. López;R. López;M. Mayor;R. Rebolo;S. Randich;A. Ecuvillon;C. D. Cerdeña
中科院分区：
文献类型：
--
作者：
N. Santos;G. Israelian;R. López;R. López;M. Mayor;R. Rebolo;S. Randich;A. Ecuvillon;C. D. Cerdeña
在本文中，我们提出了铍（Be）的丰度在一个大样本的41个太阳系外行星的主恒星，并为29颗恒星没有任何已知的行星质量的伴星，跨越一个大范围的有效温度。Be丰度通过在标准局部热力学平衡中进行的光谱合成，使用用各种仪器获得的光谱得到。结果似乎证实，总体而言，行星宿主恒星具有“正常”的Be丰度，尽管可能存在微小但不显着的差异。这一结果进行了讨论，我们表明，这种差异可能不是由于任何恒星的“污染”事件。换句话说，我们的研究结果支持了行星宿主恒星的高金属含量总体上具有“原始”起源的观点。然而，我们也发现了一小部分行星宿主晚F和早G矮星，它们可能具有高于平均水平的Be丰度。偏移的原因尚不清楚，可能与行星物质的吞没、星系化学演化效应或相似温度恒星的恒星质量差异有关。
In this paper we present beryllium (Be) abundances in a large sample of 41 extra-solar planet host stars, and for 29 stars without any known planetary-mass companion, spanning a large range of eff ective temperatures. The Be abun- dances were derived through spectral synthesis done in standard Local Thermodynamic Equilibrium, using spectra obtained with various instruments. The results seem to confirm that overall, planet-host stars have "normal" Be abundances, although a small, but not significant, difference might be present. This result is discussed, and we show that this difference is probably not due to any stellar "pollution" events. In other words, our results support the idea that the high-metal content of planet-host stars has, overall, a "primordial" origin. However, we also find a small subset of planet-host late-F and early-G dwarfs that might have higher than average Be abundances. The reason for the offset is not clear, and might be related either to the engulfment of planetary material, to galactic chemical evolution effects, or to stellar-mass differences for stars of similar temperature.