论文标题
T托里北部是“古典” T托里之星？
Is T Tauri North a 'Classical' T Tauri star?
论文作者
论文摘要
我们提出了高分辨率$ h $ - 和$ k $ -band tauri star t tau north的观测值。合成光谱建模用于得出该恒星的$ K $带温度，表面重力，磁场强度和旋转速度。 $ k $ -band光谱温度测量的是$ \ rm t_ {k \ text {-band}} = 3976 \ pm 90 k $，它是$ \ sim 1000 \，\ rm k $ cooly远比从光学观测值测得的温度。我们的$ k $ - 带温度测量是使用等效宽度线比与$ h $ band中的温度关系确认的，从中，$ \ rm t_ {h \ text {-band}} = 4085 \ pm 155 k $得出。这种光学与IR温度差异被解释为凉爽或热点，或两者兼而有之，覆盖了T tau n表面的很大一部分。用于t tau n $ \ log {g} = 3.45 \ pm 0.14 $的重力低于Taurus中24个经典的Tauri恒星样本中其他所有其他恒星的重力。将这些温度和重力结果与磁性恒星进化模型相结合，我们发现T tau n的年龄小于1 Myr。这些结果表明，与金牛座的大多数经典T牛里星相比，T tau n处于更早的进化阶段，认为它是从嵌入的南部二元系统形成后不久从嵌入的南部二元系统弹出的质体。
We present high-resolution $H$- and $K$-band spectroscopic observations of the archetypal T Tauri star T Tau North. Synthetic spectral modeling is used to derive the $K$-band temperature, surface gravity, magnetic field strength, and rotational velocity for this star. The $K$-band spectroscopic temperature measured is $\rm T_{K\text{-band}} = 3976 \pm 90 K$, which is $\sim 1000 \, \rm K$ cooler than the temperature measured from optical observations. Our $K$-band temperature measurement for T Tau N is confirmed using equivalent width line ratio vs. temperature relations in the $H$-band, from which a $\rm T_{H\text{-band}} = 4085 \pm 155 K$ is derived. This optical vs. IR temperature difference is interpreted as cool or hot spots, or both, covering a significant part of the surface of T Tau N. The gravity derived for T Tau N $\log{g}=3.45 \pm 0.14$ is lower than the gravity of nearly every other star in a sample of 24 classical T Tauri stars in Taurus. Combining these temperature and gravity results with magnetic stellar evolutionary models, we find the age of T Tau N to be less than 1 Myr old. These results suggest that T Tau N is in an earlier evolutionary stage than most classical T Tauri stars in Taurus, arguing that it is a protostar ejected from the embedded southern binary system shortly after its formation.
