玻璃的奇特情况I：不同类型的高电离和可变性
The Curious Case of Glass I: High Ionization and Variability of Different Types
摘要：
我们对红外伴星Glass Ib的斯皮策IRS观测揭示了具有高电离的精细结构发射（[NeIII]/[NeII]=2.1和[SIV]/[SIII]=0.6），这表明该气体可能被硬辐射照射。虽然模型表明金牛座T星可能存在极紫外线辐射（Hollenbach & Gorti 2009和其中的参考文献），但这是第一次在年轻恒星中检测到[SIV]和如此高的[NeIII]/[NeII]比率。我们还发现，玻璃Ib显示分子HCN，CO2，和H2O的发射。在这里，我们调查的玻璃我二元系统，并考虑可能导致高电离，无论是从外流或磁盘照射的机制。我们还模拟了玻璃Ia和Ib的光谱能量分布，以测试该系统是否是变色龙I恒星形成区域的年轻成员，并考虑该系统的其他可能的分类。我们发现玻璃Ib是高度可变的，显示在光学，近红外和中红外波长的连续强度和发射功能的变化。光学光变曲线表明，从2002年中期开始，玻璃Ib中的一颗中心恒星组件在2.5年内完全可见，并且可能在此期间显示出周期性的变化，并重复短周期的变暗。由于在斯皮策IRS观测之前或之后的观测中没有检测到精细结构发射，我们探讨了玻璃Ib的可变性质是否与气体高度电离有关，可能是由于可变吸积或X射线耀斑。
英文摘要：
Our Spitzer IRS observation of the infrared companion Glass Ib revealed fine structure emission with high ionization ([NeIII]/[NeII]=2.1 and [SIV]/[SIII]=0.6) that indicates the gas is likely illuminated by hard radiation. While models suggest extreme ultraviolet radiation could be present in T Tauri stars (Hollenbach & Gorti 2009 and references therein), this is the first detection of [SIV] and such a high [NeIII]/[NeII] ratio in a young star. We also find that Glass Ib displays the molecules HCN, CO2, and H2O in emission. Here we investigate the Glass I binary system and consider possible mechanisms that may have caused the high ionization, whether from an outflow or disk irradiation. We also model the spectral energy distributions of Glass Ia and Ib to test if the system is a young member of the Chameleon I star-forming region, and consider other possible classifications for the system. We find Glass Ib is highly variable, showing changes in continuum strength and emission features at optical, near-infrared, and mid-infrared wavelengths. The optical light curve indicates that a central stellar component in Glass Ib became entirely visible for 2.5 years beginning in mid-2002, and that possibly displayed periodic variability with repeated, short-period dimming during that time. As the fine structure emission was not detected in observations before or after our Spitzer IRS observation, we explore whether the variable nature of Glass Ib is related to the gas being highly ionized, possibly due to variable accretion or an X-ray flare.
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