标题： 关于LAMOST-Kepler恒星具有振荡测量的表面重力的LSP3估计 显示英文标题

标题： On the LSP3 estimates of surface gravity for LAMOST-Kepler stars with asteroseismic measurements

摘要： 星震学能够推导出恒星的精确表面重力值。 目前在开普勒观测区域内的大量恒星可以进行精确的星震学测定，这些结果可用于检验并校准通过大规模光谱巡天（如正在进行的大天区面积多目标光纤光谱望远镜（LAMOST）银河系巡天）所获得的大量恒星的光谱测定表面重力。 LAMOST光谱巡天已经在开普勒观测区域内获取了大量的恒星光谱。 北京大学的LAMOST恒星参数管道（LSP3）通过对MILES经验光谱库的模板匹配确定了这些恒星的大气参数。 在当前工作中，我们将LSP3得出的表面重力与两个星震学样本进行了比较——Huber等人（2014年）的最大样本和Hekker等人（2012年、2013年）的最准确样本。 我们发现LSP3的表面重力与Hekker等人（2012年、2013年）的星震学值非常一致，差异约为0.2 dex。 除了少数情况外，Huber等人（2014年）的星震学表面重力和LSP3的光谱测定值在广泛的表面重力范围内是一致的。 然而，在仔细检查后可以识别出一些差异模式。 本文还简要讨论了未来改进LSP3光谱测定恒星大气参数的潜在方法。 此外，还讨论了有效温度和金属丰度对巨星星震学表面重力测定的影响。 显示英文摘要

摘要： Asteroseismology allows for deriving precise values of surface gravity of stars. The accurate asteroseismic determinations now available for large number of stars in the Kepler fields can be used to check and calibrate surface gravities that are currently being obtained spectroscopically for a huge numbers of stars targeted by large-scale spectroscopic surveys, such as the on-going Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Galactic survey. The LAMOST spectral surveys have obtained a large number of stellar spectra in the Kepler fields. Stellar atmospheric parameters of those stars have been determined with the LAMOST Stellar Parameter Pipeline at Peking University (LSP3), by template matching with the MILES empirical spectral library. In the current work, we compare surface gravities yielded by LSP3 with those of two asteroseismic samples - the largest sample from Huber et al. (2014) and the most accurate sample from Hekker et al. (2012, 2013). We find that LSP3 surface gravities are in good agreement with asteroseismic values of Hekker et al. (2012, 2013), with a dispersion of about 0.2 dex. Except for a few cases, asteroseismic surface gravities of Huber et al. (2014) and LSP3 spectroscopic values agree for a wide range of surface gravities. However, some patterns of differences can be identified upon close inspection. Potential ways to further improve the LSP3 spectroscopic estimation of stellar atmospheric parameters in the near future are briefly discussed. The effects of effective temperature and metallicity on asteroseismic determinations of surface gravities for giant stars are also discussed.