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arXiv 1905.10312astro-ph.GA
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年轻星团NGC 2264中最低质量恒星盘调节的证据

Evidence for disc regulation in the lowest-mass stars of the young stellar cluster NGC 2264

Santiago Orcajo, Lucas A. Cieza, Roberto Gamen, Dawn Peterson

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11 pages, 14 figures, accepted by Monthly Notices of the Royal Astronomical Society
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摘要：

在主序星之前的阶段，星盘的相互作用已经被证明可以消除恒星的角动量，并调节M2和更早光谱类型恒星的自转周期。圆盘调节是否也延伸到具有较晚光谱类型的恒星仍然是一个争论的问题。在这里，我们提出了一个样本中的180多颗恒星的光谱类型M3和以后（对应于恒星质量$\leq 0.3 M_\odot$）在年轻的星团NGC 2264星盘相互作用的研究。结合旋转周期的文献，新的和文献的光谱类型，和新提出的深斯皮策观测，我们表明，与光盘的质量低于0.3 $M_\odot$的恒星也旋转速度比没有光盘在相同的质量制度。我们的研究结果表明，盘调节仍然在这些低质量的恒星，虽然这一过程的效率可能低于高质量的对象。我们确认，恒星的光谱类型早于和晚于M2有不同的周期分布和恒星的光谱类型M5和更晚的旋转甚至更快的M3和M4型星。

英文摘要：

In the pre-main-sequence stage, star-disc interactions have been shown to remove stellar angular momentum and regulate the rotation periods of stars with M2 and earlier spectral types. Whether disc regulation also extends to stars with later spectral types still remains a matter of debate. Here we present a star-disc interaction study in a sample of over 180 stars with spectral types M3 and later (corresponding to stellar masses $\leq 0.3 M_\odot$) in young stellar cluster NGC 2264. Combining rotation periods from the literature, new and literature spectral types, and newly presented deep Spitzer observations, we show that stars with masses below 0.3 $M_\odot$ with discs also rotate slower than stars without a disc in the same mass regime. Our results demonstrate that disc-regulation still operates in these low-mass stars, although the efficiency of this process might be lower than in higher-mass objects. We confirm that stars with spectral types earlier and later than M2 have distinct period distributions and that stars with spectral types M5 and later rotate even faster M3 and M4-type stars.

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