标题： 红外天文卫星（IRAC）观测金牛座前主序星 显示英文标题

标题： IRAC Observations of Taurus Pre-Main Sequence Stars

摘要： 我们展示了利用斯皮策空间望远镜上的IRAC相机获得的红外测光数据，涉及塔乌斯星形成区内82颗前主序星和褐矮星样本。我们在某些IRAC颜色-颜色图上发现有盘和无盘天体之间存在明显的分离。一些“过渡”天体被注意到，这些系统内盘中的小尘埃已被清除。在IRAC波长下区分纯盘系统与残留原恒星包层的天体更为困难，尤其是对于低速率吸积且角动量大的天体。我们的结果总体上证实了Allen等人和Megeath等人先前论文中使用的IRAC颜色分类方案，该方案用于区分原恒星、有盘的T Tauri星以及没有（内）盘的年轻恒星。观测到的IRAC颜色与最近改进的盘模型非常一致，并且总体上符合从更大波长范围内分析得出的原恒星包层模型。我们还对几个塔乌斯星形成区内的特殊天体进行了评论。我们的结果应该有助于解释其他研究较少的恒星形成区域内IRAC的数据。 显示英文摘要

摘要： We present infrared photometry obtained with the IRAC camera on the Spitzer Space Telescope of a sample of 82 pre-main sequence stars and brown dwarfs in the Taurus star-forming region. We find a clear separation in some IRAC color-color diagrams between objects with and without disks. A few ``transition'' objects are noted, which correspond to systems in which the inner disk has been evacuated of small dust. Separating pure disk systems from objects with remnant protostellar envelopes is more difficult at IRAC wavelengths, especially for objects with infall at low rates and large angular momenta. Our results generally confirm the IRAC color classification scheme used in previous papers by Allen et al. and Megeath et al. to distinguish between protostars, T Tauri stars with disks, and young stars without (inner) disks. The observed IRAC colors are in good agreement with recent improved disk models, and in general accord with models for protostellar envelopes derived from analyzing a larger wavelength region. We also comment on a few Taurus objects of special interest. Our results should be useful for interpreting IRAC results in other, less well-studied star-forming regions.