论文标题
用近红外整体场光谱表征年轻的Visual M-Dwarf二进制
Characterising Young Visual M-dwarf Binaries with Near-Infrared Integral Field Spectra
论文作者
论文摘要
我们介绍了七个年轻的M-dwarf多个系统的七个近距离视觉二进制对的整体场光谱研究的结果。目标系统是天文监测Astralux计划的一部分，对数百个M-dwarf系统进行了调查，以实现多重性，并获得用于轨道约束的星体时期。我们的新VLT/SINFONI数据为这些低质量M-Dwarf二进制文件中的七个提供了J，H和K频段中解决的光谱类型分类，我们通过将其与经验模板进行比较并检查K频段中的吸水强度来确定它们。中分辨率K波段还使我们能够为单个组件得出有效的温度。调查中的所有目标都显示出几种青年迹象，有些具有类似于年轻移动组的运动学迹象，或者通过测量J波段中重力敏感碱系的等效宽度确定的低表面重力。还将来自我们目标的分辨光度法与理论进化模型的同句进行了比较，这进一步暗示了年轻人。对这些系统的持续监视将提供动态质量，这些系统可以看作是象征性的二进制基准测试，可以将来用于校准低质量恒星的进化模型。
We present the results from an integral field spectroscopy study of seven close visual binary pairs of young M-dwarf multiple systems. The target systems are part of the astrometric monitoring AstraLux program, surveying hundreds of M-dwarf systems for multiplicity and obtaining astrometric epochs for orbital constraints. Our new VLT/SINFONI data provides resolved spectral type classification in the J, H and K bands for seven of these low-mass M-dwarf binaries, which we determine by comparing them to empirical templates and examining the strength of water absorption in the K-band. The medium resolution K-band spectra also allows us to derive effective temperatures for the individual components. All targets in the survey display several signs of youth, and some have kinematics similar to young moving groups, or low surface gravities which we determine from measuring equivalent widths of gravity sensitive alkali lines in the J-band. Resolved photometry from our targets is also compared with isochrones from theoretical evolutionary models, further implying young ages. Dynamical masses will be provided from ongoing monitoring of these systems, which can be seen as emblematic binary benchmarks that may be used to calibrate evolutionary models for low-mass stars in the future.
