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arXiv 1606.02115astro-ph.SRastro-ph.GA
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在Milky Way遗迹中探测类似太阳的振荡:使用来自NASA K2任务的数据的M4中K巨星的星震学

Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission

A. Miglio, W. J. Chaplin, K. Brogaard, M. N. Lund, B. Mosser, G. R. Davies, R. Handberg, A. P. Milone, A. F. Marino, D. Bossini, Y. P. Elsworth, F. Grundahl, T.… 展开作者

A. Miglio, W. J. Chaplin, K. Brogaard, M. N. Lund, B. Mosser, G. R. Davies, R. Handberg, A. P. Milone, A. F. Marino, D. Bossini, Y. P. Elsworth, F. Grundahl, T. Arentoft, L. R. Bedin, T. L. Campante, J. Jessen-Hansen, C. D. Jones, J. S. Kuszlewicz, L. Malavolta, V. Nascimbeni, E. L. Sandquist

摘要:

对K巨星的星震约束使得我们有可能推断出成千上万颗场星的半径、质量和年龄。然而,对这些属性的独立估计的测试是稀缺的,特别是在贫金属制度。本文报道了在球状星团M4红巨星支和红水平支的8颗恒星中探测到的类太阳振荡。这些探测是在K2飞行任务第二次活动期间的光度观测中进行的。利用独立的约束的距离,我们估计质量的8星利用不同的组合地震和非地震输入。当引入一个校正的Delta nu的比例关系所建议的恒星模型,RGB星,我们发现很好的协议与预期的质量从等时线拟合,并与使用独立的方法得出的距离模量。相对于独立质量的偏移较低,或与平均RGB质量的不确定性相当(4 - 10%,取决于所使用的约束的组合)。我们的研究结果提供信心,在金属穷人制度的asteroseic质量。我们注意到,将需要更大的样本,以允许更严格的测试系统的不确定性,在所有的观测(地震和非地震),并探讨RHB星的属性,在集群中的不同群体。

英文摘要:

Asteroseismic constraints on K giants make it possible to infer radii, masses and ages of tens of thousands of field stars. Tests against independent estimates of these properties are however scarce, especially in the metal-poor regime. Here, we report the detection of solar-like oscillations in 8 stars belonging to the red-giant branch and red-horizontal branch of the globular cluster M4. The detections were made in photometric observations from the K2 Mission during its Campaign 2. Making use of independent constraints on the distance, we estimate masses of the 8 stars by utilising different combinations of seismic and non-seismic inputs. When introducing a correction to the Delta nu scaling relation as suggested by stellar models, for RGB stars we find excellent agreement with the expected masses from isochrone fitting, and with a distance modulus derived using independent methods. The offset with respect to independent masses is lower, or comparable with, the uncertainties on the average RGB mass (4-10%, depending on the combination of constraints used). Our results lend confidence to asteroseismic masses in the metal poor regime. We note that a larger sample will be needed to allow more stringent tests to be made of systematic uncertainties in all the observables (both seismic and non-seismic), and to explore the properties of RHB stars, and of different populations in the cluster.

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