色指数刻度对金牛T星的适用性
Applicability of colour index calibrations to T Tauri stars
摘要：
我们研究了几种宽带颜色的有效温标对金牛T星（TTS）的适用性。我们考虑到不同的颜色系统，以及恒星的参数，如金属丰度和表面重力，影响转换的颜色指数或光谱类型的有效温度。对于一个大样本的TTS，我们得到的温度从宽带颜色指数和检查，如果他们是一致的，在统计意义上的温度从光谱类型推断。有一些标度（V-H、V-K、I-J、J-H和J-K）确实预测了与光谱类型相同的温度，因此至少可以用来确认有效温度。此外，我们研究TTS与动态派生的群众是否可以用于测试的进化模型和有效的温度校准。我们比较观测到的食金牛座T二进制V1642 Ori A的演化模型的预测在两个H-R和基尔图使用的温度与几个颜色指数尺度。我们检查是否进化模型和颜色指数尺度是一致的coevality和动态质量的二进制组件。事实证明，基尔图提供了比H-R图更严格的测试。只有Baraffe等人（1998）的混合长度参数为1.9的演化模型和D 'Antona & Mazzitelli（1994，1997）的演化模型在Kiel图中与Houdashelt等人（2000）和Kenyon & Hartmann（1995）的一些转换尺度结合显示出一致的结果。
英文摘要：
We examine the applicability of effective temperature scales of several broad band colours to T Tauri stars (TTS). We take into account different colour systems as well as stellar parameters like metallicity and surface gravity which influence the conversion from colour indices or spectral type to effective temperature. For a large sample of TTS, we derive temperatures from broad band colour indices and check if they are consistent in a statistical sense with temperatures inferred from spectral types. There are some scales (for V-H, V-K, I-J, J-H, and J-K) which indeed predict the same temperatures as the spectral types and therefore can be at least used to confirm effective temperatures. Furthermore, we examine whether TTS with dynamically derived masses can be used for a test of evolutionary models and effective temperature calibrations. We compare the observed parameters of the eclipsing T Tauri binary V1642 Ori A to the predictions of evolutionary models in both the H-R and the Kiel diagram using temperatures derived with several colour index scales. We check whether the evolutionary models and the colour index scales are consistent with coevality and the dynamical masses of the binary components. It turns out that the Kiel diagram offers a stricter test than the H-R diagram. Only the evolutionary models of Baraffe et al. (1998) with mixing length parameter 1.9 and of D'Antona & Mazzitelli (1994, 1997) show consistent results in the Kiel diagram in combination with some conversion scales of Houdashelt et al. (2000) and of Kenyon & Hartmann (1995).
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