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arXiv 1408.4496astro-ph.SR
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开普勒DBV的七周期星震拟合

Seven-Period Asteroseismic Fit of the Kepler DBV

Agnes Kim, Roy Ostensen, J. J. Hermes, Judith Provencal

摘要:

我们提出了一个新的,更好的约束的氦-大气(DB)的白矮星在原来的开普勒任务的视野中发现的星震分析。在两年的观测过程中,至少产生了七个独立的模式,比发现该物体的论文中发现的多两个。有了几个三元组和二元组,我们能够在执行拟合之前修复几个模式的$\ell$和$\rm{m}$识别,大大减少了我们必须对模式识别做出的假设数量。我们发现一个非常薄的氦层,这个相对较热的DB,这增加了证据的假设,即氦扩散DB冷却过程中向外。至少有几种模式在进化的时间尺度上似乎是稳定的,可以让我们在未来几年的地面跟踪过程中通过监测恒星来测量冷却速率。

英文摘要:

We present a new, better-constrained asteroseismic analysis of the helium-atmosphere (DB) white dwarf discovered in the field of view of the original Kepler mission. Observations obtained over the course of two years yield at least seven independent modes, two more than were found in the discovery paper for the object. With several triplets and doublets, we are able to fix the $\ell$ and $\rm{m}$ identification of several modes before performing the fitting, greatly reducing the number of assumptions we must make about mode identification. We find a very thin helium layer for this relatively hot DB, which adds evidence to the hypothesis that helium diffuses outward during DB cooling. At least a few of the modes appear to be stable on evolutionary timescales and could allow us to obtain a measurement of the rate of cooling with monitoring of the star over the course of the next few years with ground-based follow-up.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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