A MULTI-SITE CAMPAIGN TO MEASURE SOLAR-LIKE OSCILLATIONS IN PROCYON. II. MODE FREQUENCIES

A MULTI-SITE CAMPAIGN TO MEASURE SOLAR-LIKE OSCILLATIONS IN PROCYON. II. MODE FREQUENCIES
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测量南河三星中类太阳振荡的多站点活动。

DOI:
10.1088/0004-637x/713/2/935
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发表时间:
2010
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Bedding T
Bedding T
中科院分区:
--
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--
作者:
Bedding T

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我们已经分析了从多个站点的活动,以观察在F5星星南河三振荡的数据。这些数据包括我们用11台望远镜在三个多星期内获得的高精度速度。一种新的方法来调整数据的权重,使我们能够抑制旁瓣的功率谱。将功率谱叠加在所谓的埃歇勒图中,可以看到两个清晰的脊,我们将其与角度的偶数和奇数值(分别为l= 0和2,以及l= 1和3)相识别。我们解释了一个强的,窄的峰在446 μHz,位于接近l= 1的脊作为一个模式与混合字符。我们发现,脊质心的频率和它们的分离是有用的诊断为asteroseismology。特别是,在大的分离的变化似乎表明在声速分布在1000秒的声学深度的故障。我们列出了从跨越20个径向阶的数据中提取的55种模式的频率,这一范围与最好的太阳数据相当,这将为理论模型提供有价值的约束。与已发表的模型的初步比较表明,南河三的径向模式的观测频率和计算频率之间的偏移量与太阳和其他冷恒星的径向模式非常不同。我们发现南河三的平均寿命为1.29+ 0.55− 0.49天,比太阳的2-4天短得多。
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 11 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 échelle diagram reveals two clear ridges, which 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 μHz 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∼ 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.
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