论文标题
接近粉丝到themis和polana-eulalia复合体的可见光谱
Near-ultraviolet to visible spectroscopy of the Themis and Polana-Eulalia complex families
论文作者
论文摘要
目标。我们研究的目的是获得可见的近粉状物（NUV-VIS，0.35-0.95微米）的反射光谱，其原始小行星的反射光谱侧重于Themis和Polana-Eulalia Complex族的成员。这种表征使我们能够讨论两个最近的样本返回任务小行星（162173）Ryugu和（101955）Bennu的起源。方法。我们使用位于Roque de los Muchachos天文台的望远镜和已经发布的远程光谱数据获得了靶小行星的低分辨率可见光谱，至0.35微米。我们研究原始小行星的NUV-VIS反射率光谱的特征，重点关注Themis家族和Polana-Eulalia家族综合体的数据。最后，我们将这些家族的NUV特征与（162173）Ryugu和（101955）Bennu进行了比较。在这项工作中，我们还研究了由于使用Landolt目录中的五个常用恒星作为太阳能类似物，以在NUV波长范围内获得小行星反射率。我们将兰德尔目录中五个G-Star的光谱与精心研究的太阳能模拟Hyades Hyades 64进行了比较，同时也观察到。结果。我们发现，许多广泛使用的Landolt的G型恒星不是NUV波长光谱区域中的太阳能类似物，因此不适合获得小行星的反射率光谱。我们还发现，即使Themis家族和Polana-Eulalia家族综合体在可见的波长处显示出相似的蓝度，但Themis家族的NUV吸收比Polana-Eulalia家族综合体的吸收要深得多。在NUV-VIS斜坡上，我们没有发现新的Polana和Eulalia家族之间的显着差异。 （162173）Ryugu和（101955）在NUV-VIS中，Bennu的光谱特征与Polana-Eulalia Family Complex的NUV-VIS中的光谱特征重叠，这意味着它。
Aims. The aim of our study is to obtain the near-ultraviolet to visible (NUV-VIS, 0.35 - 0.95 micron) reflectance spectra of primitive asteroids with a focus on members of the Themis and Polana-Eulalia complex families. This characterization allows us to discuss the origin of two recent sample return mission target asteroids, (162173) Ryugu and (101955) Bennu. Methods. We obtain low-resolution visible spectra of target asteroids down to 0.35 micron using the telescopes located at the Roque de los Muchachos Observatory and revisit spectroscopic data that have already been published. We study the characteristics of the NUV-VIS reflectance spectra of primitive asteroids, focusing on data of the Themis family and the Polana-Eulalia family complex. Finally, we compare the NUV characteristics of these families with (162173) Ryugu and (101955) Bennu. In this work, we also study systematic effects due to the use of the five commonly used stars in Landolt's catalog as solar analogs to obtain the asteroid reflectance in the NUV wavelength range. We compare the spectra of five G-stars in Landolt's catalog with the spectrum of the well-studied solar analog Hyades 64, also observed on the same nights. Results. We find that many widely used Landolt's G-type stars are not solar analogs in the NUV wavelength spectral region and thus are not suitable for obtaining the reflectance spectra of asteroids. We also find that, even though the Themis family and the Polana-Eulalia family complex show a similar blueness at visible wavelengths, the NUV absorption of the Themis family is much deeper than that of the Polana-Eulalia family complex. We did not find significant differences between the New Polana and Eulalia families in terms of the NUV-VIS slope. (162173) Ryugu's and (101955) Bennu's spectral characteristics in the NUV-VIS overlap with those of the Polana-Eulalia family complex which implies that it.
