标题： 富含行星的恒星中的氧丰度。不同丰度指示剂的比较 显示英文标题

标题： Oxygen abundances in planet-harbouring stars. Comparison of different abundance indicators

摘要： 我们对155颗类似太阳的恒星进行了详细且统一的氧丰度研究，其中96颗是行星宿主星，59颗构成了一个体积受限的对比样本（没有已知行星）。 对于[O I] 6300 \AA 线和O I三重线进行了等效宽度测量，并对多个OH线进行了光谱合成。 NLTE修正值被计算并应用于从O I 7771-5 \AA 三重线得出的LTE丰度结果。 分别在103、87和77颗矮星上获得了来自[O I]、O I三重线和近紫外OH的丰度。 我们首次在大量类似太阳的恒星样本中对这三个氧指示器进行了详细且统一的比较。 禁线和OH线的[O/H]比值之间有很好的一致性，而NLTE三重线显示出系统性较低的丰度。 我们发现OH、[O I]和O I三重线之间的差异在大多数情况下不超过0.2 dex。 我们研究了行星宿主星和对比样本星的丰度趋势，未检测到与行星存在明显的异常。 所有三个指标都表明，在金属丰度范围-0.8<[Fe/H]<0.5内，[O/Fe]随[Fe/H]的增加而平均下降。 相对于对比样本，行星宿主星表现出0.1-0.2 dex的氧过量。 显示英文摘要

摘要： We present a detailed and uniform study of oxygen abundances in 155 solar type stars, 96 of which are planet hosts and 59 of which form part of a volume-limited comparison sample with no known planets. EW measurements were carried out for the [O I] 6300 \AA line and the O I triplet, and spectral synthesis was performed for several OH lines. NLTE corrections were calculated and applied to the LTE abundance results derived from the O I 7771-5 \AA\ triplet. Abundances from [O I], the O I triplet and near-UV OH were obtained in 103, 87 and 77 dwarfs, respectively. We present the first detailed and uniform comparison of these three oxygen indicators in a large sample of solar-type stars. There is good agreement between the [O/H] ratios from forbidden and OH lines, while the NLTE triplet shows a systematically lower abundance. We found that discrepancies between OH, [O I] and the O I triplet do not exceed 0.2 dex in most cases. We have studied abundance trends in planet host and comparison sample stars, and no obvious anomalies related to the presence of planets have been detected. All three indicators show that, on average, [O/Fe] decreases with [Fe/H] in the metallicity range -0.8<[Fe/H]<0.5. The planet host stars present an average oxygen overabundance of 0.1-0.2dex with respect to the comparison sample.