The Role of Internal Photons on the Chemistry of the Circumstellar Envelopes of AGB Stars
The Role of Internal Photons on the Chemistry of the Circumstellar Envelopes of AGB Stars
复制标题
内部光子对 AGB 恒星星周包层化学的作用
作者：
M. Van de Sande;T. Millar
最近的高空间分辨率观测的气体和尘埃在拱星信封（CSE）的AGB星的形态比光滑的密度分布所产生的球对称，恒定的质量损失率要复杂得多。特别是，对螺旋弧和圆盘的观察表明可能存在一个双星伴星，在某些情况下，它会引起银河演化探测器探测到的紫外光子。在本文中，我们扩展了我们最近的化学模型，在一个cluberous，多孔CSE周围的AGB星星，包括恒星黑体光子对CSE化学的影响。我们的研究结果表明，内部的光子，在一个cluberous，多孔CSE，可以改变化学在几个恒星半径，并为某些分子，改变丰度到几百恒星半径。他们进一步表明，来自伴星或吸积盘的较硬辐射将对AGB恒星尘埃形成区和内部CSE的化学产生重大影响。
Recent high spatial resolution observations of gas and dust in the circumstellar envelopes (CSEs) of AGB stars indicate morphologies much more complex than the smooth density distributions generated by spherically symmetric, constant mass-loss rates. In particular, the observation of spiral arcs and disks indicates the likely presence of a binary companion that in some cases gives rise to the UV photons detected by Galaxy Evolution Explorer. In this paper, we extend our recent model of the chemistry in a clumpy, porous CSE around an AGB star to include the influence of stellar blackbody photons on the CSE chemistry. Our results indicate that internal photons, in a clumpy, porous CSE, can alter chemistry within a few stellar radii and, for some molecules, alter abundances out to several hundred stellar radii. They further suggest that harder radiation from companion stars or accretion disks will have a substantial impact on chemistry in the dust formation zones and inner CSEs of AGB stars.
确定非均匀 AGB 流出中结块和孔隙率对化学的影响
影响因子：
6.5
作者：
Van De Sande M
通讯作者：
Van De Sande M