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首页> 外文期刊>The Astrophysical journal >AN EFFECTIVE TEMPERATURE SCALE FOR LATE-M AND L DWARFS, FROM RESONANCE ABSORPTION LINES OF CS I AND RB I
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AN EFFECTIVE TEMPERATURE SCALE FOR LATE-M AND L DWARFS, FROM RESONANCE ABSORPTION LINES OF CS I AND RB I

机译：从CS I和RB I的共振吸收线算出的M和L型矮星的有效温度标度

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摘要

We present Keck HIRES spectra of six late-M dwarfs and 11 L dwarfs. Our goal is to assign effective temperatures to the objects using detailed atmospheric models and fine analysis of the alkali resonance absorption lines of Cs I and Rb I. These yield mutually consistent results (± 50 K) when we use " cleared-dust" models, which account for the removal of refractory species from the molecular states but do not include dust opacities. We find a tendency for the Rb I line to imply a slightly higher temperature, which we ascribe to an incomplete treatment of the overlying molecular opacities. The final T_(eff) we adopt are based on the Cs I fits alone, though the Rb I fits support the Cs I temperature sequence. This work, in combination with results from the infrared, hints that dust in these atmospheres has settled out of the high atmosphere but is present in the deep photosphere. We also derive radial and rotational velocities for all the objects, finding that the previously discovered trend of rapid rotation for very low mass objects is quite pervasive. To improve on our analysis, there is a clear need for better molecular line lists and a more detailed understanding of dust formation and dynamics.
机译：我们介绍了6个晚期M矮人和11个L矮人的Keck HIRES光谱。我们的目标是使用详细的大气模型和对Cs I和Rb I的碱共振吸收线的精细分析，为物体分配有效温度。当使用“清除灰尘”模型时，这些结果会产生相互一致的结果（±50 K），它们解释了从分子态中去除难熔物质的原因，但不包括灰尘不透明性。我们发现Rb I线可能暗示温度略高，这归因于对上层分子不透明性的不完全处理。我们采用的最终T_（eff）仅基于Cs I拟合，尽管Rb I拟合支持Cs I温度序列。这项工作与红外的结果相结合，表明这些大气中的尘埃已经从高空大气层中沉降出来，但存在于深层光球中。我们还推导了所有物体的径向和旋转速度，发现先前发现的非常低质量物体的快速旋转趋势非常普遍。为了改进我们的分析，显然需要更好的分子线列表，并且需要更详细地了解粉尘的形成和动力学。

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