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arXiv 1902.04868astro-ph.SR
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HADES RV计划与HARPS-N在TNG。X. M矮星恒星活动与自转关系的非饱和区

HADES RV Programme with HARPS-N at TNG. X. The non-saturated regime of the stellar activity-rotation relationship for M-Dwarfs

E. González-Álvarez, G. Micela, J. Maldonado, L. Affer, A. Maggio, A. F. Lanza, E. Covino, S. Benatti, A. Bignamini, R. Cosentino, M. Damasso, S. Desidera, J. I… 展开作者

E. González-Álvarez, G. Micela, J. Maldonado, L. Affer, A. Maggio, A. F. Lanza, E. Covino, S. Benatti, A. Bignamini, R. Cosentino, M. Damasso, S. Desidera, J. I. González Hernández, A. Martínez-Fiorenzano, I. Pagano, M. Perger, G. Piotto, M. Pinamonti, M. Rainer, R. Rebolo, I. Ribas, G. Scandariato, A. Sozzetti, A. Suárez Mascareño, B. Toledo-Padrón

摘要:

目的。我们的目标是扩展在主序星FGK中发现的X射线光度(Lx)和自转周期(Prot)之间的关系,并测试它是否也适用于早M矮星,特别是在对应于慢自转星的非饱和区(Lx α P_{rot} ^{-2})。方法.我们使用的光度日冕活动指标(LX)的78个早期M矮星的样本质量范围从0.3至0.75 Msun从HArps-N红矮星系外行星巡天(HADES)径向速度(RV)方案从ROSAT和XMM-牛顿收集。旋转周期(P_{rot})的确定是通过分析Ca ii H & K和Hα活性指标的高分辨率光谱的时间序列来完成的。我们的样本主要包括旋转周期从15到60天的慢旋转制度。结果我们的工作扩展到低质量制度的观察到的趋势,更大质量的恒星表现出一个连续的转变的Lx/Lbol与普罗特幂律对较长的旋转周期值,并包括确定,在一个更准确的方式,旋转周期的值在饱和发生(P_{sat})的M矮星。结论.我们的结论是,FGK恒星的日冕活动和恒星旋转之间的关系也适用于早期M矮星在非饱和制度,表明旋转周期是足够的,以确定比Lx/Lbol。

英文摘要:

Aims. We aim to extend the relationship between X-ray luminosity (Lx) and rotation period (Prot) found for main-sequence FGK stars and test whether it also holds for early-M dwarfs, especially in the non-saturated regime (Lx α P_{rot}^{-2}) which corresponds to slow rotators. Methods. We use the luminosity coronal activity indicator (Lx) of a sample of 78 early-M dwarfs with masses in the range from 0.3 to 0.75 Msun from the HArps-N red Dwarf Exoplanet Survey (HADES) radial velocity (RV) programme collected from ROSAT and XMM-Newton. The determination of the rotation periods (P_{rot}) was done by analysing time-series of high-resolution spectroscopy of the Ca ii H & K and Hα activity indicators. Our sample principally covers the slow rotation regime with rotation periods from 15 to 60 days. Results. Our work extends to the low mass regime the observed trend for more massive stars showing a continuous shift of the Lx/Lbol vs. Prot power-law towards longer rotation period values and includes the determination, in a more accurate way, of the value of the rotation period at which the saturation occurs (P_{sat}) for M dwarf stars. Conclusions. We conclude that the relations between coronal activity and stellar rotation for FGK stars also hold for early-M dwarfs in the non-saturated regime, indicating that the rotation period is sufficient to determine the ratio Lx/Lbol.

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