标题： 一项多点观测计划，用于测量天狼星型振荡在普罗克西马座的情况。 II. 模式频率 显示英文标题

标题： A multi-site campaign to measure solar-like oscillations in Procyon. II. Mode frequencies

摘要： 我们分析了一项多站点观测计划的数据，以研究F5型星普罗西昂的振荡。 数据包括我们使用十一个望远镜在超过三周的时间内获得的高精度速度测量值。 一种新的数据权重调整方法使我们能够抑制功率谱中的旁瓣。 在所谓的“光栅图”中叠加功率谱显示出两条明显的脊线，我们将其分别归因于角量子数（l）的偶数值（l=0和2）和奇数值（l=1和3）。 我们认为位于l=1脊线附近的一个强且狭窄的446微赫兹峰值具有混合特性。 我们展示了脊线中心频率及其间隔对于恒星地震学而言是有用的诊断工具。 特别是，大间隔的变化似乎表明在约1000秒声学深度处存在声速剖面的异常现象。我们列出了从数据中提取的跨越20个径向阶次的55个模式的频率，这一范围与太阳的最佳数据相当，将为理论模型提供宝贵的约束条件。 初步比较已发表的模型显示，径向模式的观测频率与计算频率之间的偏移量对于普罗西昂与其他恒星（如太阳和较冷的恒星）相比差异显著。 我们发现普罗西昂模式的平均寿命为1.29 +0.55/-0.49天，明显短于太阳观测到的2-4天。 显示英文摘要

摘要： We have analyzed data from a multi-site campaign to observe oscillations in the F5 star Procyon. The data consist of high-precision velocities that we obtained over more than three weeks with eleven telescopes. A new method for adjusting the data weights allows us to suppress the sidelobes in the power spectrum. Stacking the power spectrum in a so-called echelle diagram reveals two clear ridges that we identify with even and odd values of the angular degree (l=0 and 2, and l=1 and 3, respectively). We interpret a strong, narrow peak at 446 muHz that lies close to the l=1 ridge as a mode with mixed character. We show that the frequencies of the ridge centroids and their separations are useful diagnostics for asteroseismology. In particular, variations in the large separation appear to indicate a glitch in the sound-speed profile at an acoustic depth of about 1000 s. We list frequencies for 55 modes extracted from the data spanning 20 radial orders, a range comparable to the best solar data, which will provide valuable constraints for theoretical models. A preliminary comparison with published models shows that the offset between observed and calculated frequencies for the radial modes is very different for Procyon than for the Sun and other cool stars. We find the mean lifetime of the modes in Procyon to be 1.29 +0.55/-0.49 days, which is significantly shorter than the 2-4 days seen in the Sun.