DYNAMICAL EVOLUTION OF VISCOUS DISKS AROUND Be STARS. I. PHOTOMETRY
DYNAMICAL EVOLUTION OF VISCOUS DISKS AROUND Be STARS. I. PHOTOMETRY
复制标题
恒星周围粘性盘的动态演化。
DOI：
10.1088/0004-637x/756/2/156
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
J. Bjorkman
中科院分区：
文献类型：
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作者：
X. Haubois;A. Carciofi;T. Rivinius;A. Okazaki;J. Bjorkman
Be星拥有气态的星周盘，它在许多方面改变了中心B星星的光谱。此外，它们在几个时间尺度和大量的可观测量上表现出可变性。把这些动力学行为的碎片放在一起并不是一件容易的事情，需要对控制观测量时间演化的物理过程有详细的了解。越来越多的证据表明Be盘可以用标准α盘理论很好地描述。本文是第一个系列，旨在研究的可能性推断几个磁盘和恒星参数，通过后续的各种观测。在这里，我们研究的时间演化的磁盘密度为不同的动力学方案，包括磁盘建立作为一个长期和稳定的质量注入从星星，磁盘耗散后发生的质量注入被关闭，以及在活跃期之后的情况下，由静止期。对于这些情况下，我们调查的时间演变的连续光度观测值使用三维非LTE辐射传输代码。我们发现，不同波长的光变曲线是特定的质量损失历史，倾角，和α粘度参数。这些光变曲线的诊断潜力进行了讨论。
Be stars possess gaseous circumstellar disks that modify in many ways the spectrum of the central B star. Furthermore, they exhibit variability at several timescales and for a large number of observables. Putting the pieces together of this dynamical behavior is not an easy task and requires a detailed understanding of the physical processes that control the temporal evolution of the observables. There is an increasing body of evidence that suggests that Be disks are well described by standard α-disk theory. This paper is the first of a series that aims at studying the possibility of inferring several disk and stellar parameters through the follow-up of various observables. Here we study the temporal evolution of the disk density for different dynamical scenarios, including the disk build-up as a result of a long and steady mass injection from the star, the disk dissipation that occurs after mass injection is turned off, as well as scenarios in which active periods are followed by periods of quiescence. For those scenarios, we investigate the temporal evolution of continuum photometric observables using a three-dimensional non-LTE radiative transfer code. We show that light curves for different wavelengths are specific of a mass loss history, inclination angle, and α viscosity parameter. The diagnostic potential of those light curves is also discussed.