Context. Since the first publication of the Gaia catalogue a new view of our Galaxy has arrived. Its astrometric and photometric information has improved the precision of the physical parameters of open star clusters obtained from them. Aims. Using the Gaia DR3 catalogue, we aim to find physical stellar members including faint stars for 370 Galactic open clusters located within 1 kpc. We also estimate the age, metallicity, distance modulus and extinction of these clusters. Methods. We employ the HDBSCAN algorithm on both astrometric and photometric data to identify members in the open clusters. Subsequently, we refine the samples by eliminating outliers through the application of the Mahalanobis metric utilizing the chi-square distribution at a confidence level of 95%. Furthermore, we characterize the stellar parameters with the PARSEC isochrones. Results. We obtain reliable star members for 370 open clusters with an average parallax error of 0.16 mas. We identify about 40% more stars in these clusters compared to previous work using the Gaia DR2 catalogue, including faint stars as new members with G > 17. Before the clustering application we correct the parallax zero-point bias to avoid spatial distribution stretching that may affect clustering results. Our membership lists include merging stars identified by HDBSCAN with astrometry and photometry. We note that the use of photometry in clustering can recover up to 10% more stars in the fainter limit than clustering based on astrometry only, this combined with the selection of stars filtering them out by quality cuts significantly reduces the number of stars with huge parallax error. After clustering, we estimate age, Z, and AV from the photometry of the membership lists.
Search for quasar pairs with Gaia astrometric data. II. Photometric redshift prediction with machine learning for the MGQPC catalogue
Institute for Frontier in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿天文与天体物理研究院);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院)
A Three-Dimensional Analytical Model of the Interstellar Extinction within the Nearest Kiloparsec
我们提出了一个新版本的空间星际消光变化的分析模型在最近的千秒差距。该模型将3D尘埃分布视为三个重叠层的叠加:(1)沿银河系中平面的层,(2)古尔德带的层,以及(3)穿过仙王座和变色龙尘埃云复合体的层。在每一层中,灰尘密度随着离层中平面的距离的增加而呈指数下降。此外,有正弦纵向消光变化沿每层的中平面。我们已经使用四个数据集找到了我们模型的29个参数的最可能值:Gontcharov(2017),Lallement等人(2019)和Green等人(2019)的3D恒星红化地图以及Anders等人(2022)从Gaia EDR3中推断的993291颗巨星。所有的数据都给出了相似的模型参数估计。我们的模型预测了一颗恒星或空间中一个点的消光,在银河系高纬度和低纬度的精度分别为$σ(A_\mathrm{V})=0.07$至0.37。尘埃介质的自然波动在这些值中占主导地位。当忽略介质的波动时,我们的模型预测了扩展对象(星系,星团,尘埃云)或小区域空间的平均消光,其精度分别为$σ(A_\mathrm{V})=0.04$至0.15(对于高和低银河系纬度)。Green et al.(2019)和Anders et al.(2022)一致估计了$A_\mathrm{V}=0.12^m$在太阳上方或下方整个银河尘埃半层的高纬度消光,以及介质$σ(A_\mathrm{V})=0.06^m$的自然波动。我们的模…
CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台光学天文重点实验室);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院);Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University(北京师范大学天文与空间科学学院前沿交叉研究院)
Solar twins in Gaia DR3 GSP-Spec II. Age distribution and its implications for the Sun's migration
Tokyo Metropolitan University(东京都立大学);Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange(蔚蓝海岸大学,蔚蓝海岸天文台,法国国家科学研究中心,拉格朗日实验室);National Astronomical Observatory of Japan(日本国立天文台);Department of Physics, Tokyo Metropolitan University(东京都立大学物理系)
Photometric metallicity of Galactic RR Lyrae stars in the Gaia DR3 era
University of Delhi(德里大学);Indian Institute of Astrophysics(印度天体物理研究所);Inter-University Center for Astronomy and Astrophysics(大学间天文与天体物理中心);University of Petroleum and Energy Studies(石油与能源大学)
The Secret Lives of Open Clusters: a Multiwavelength Examination of Three Open Clusters
Curtin University(科廷大学);University of Vienna(维也纳大学);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);Swinburne University of Technology(斯威本科技大学);ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)(引力波发现卓越研究中心(OzGrav));National Radio Astronomy Observatory(国家射电天文台);National Central University(中央大学);Michigan State University(密歇根州立大学);Wayne State University(韦恩州立大学);University of Wisconsin - Madison(威斯康星大学麦迪逊分校)
The O star hinterland of the Galactic starburst, NGC 3603
非常明亮和紧凑的大质量年轻星团NGC 3603被引用为银河系中星暴的一个例子,并与大麦云中的R136/30剑鱼座区域进行了大量研究。在这里,我们建立在Mohr-Smith等人(2017)发现的大量红O星的基础上。我们构建了一个包含288颗具有自行的候选O星的列表,位于以NGC 3603为中心的1.5x1.5平方度的天空区域中,通过将Mohr-Smith et al.(2017)目录与Gaia DR 2(Gaia Collaboration et al. 2018)进行交叉匹配。这为第一次全面检查NGC 3603晕中这些大质量恒星的自行提供了基础,相对于研究得更好的中心区域。我们确定了多达11个可能的O型星喷射-其中8个将在0.60和0.95百万年前被喷射(支持c.1百万年的年龄已被归因于明亮的星团中心)。七个候选的抛射体被安排在星团核心以南的部分环中,半径为9-18弧分(如果星团距离7千秒差距,则为18-36秒差距)。我们还表明,该星团有一个光环的进一步100 O星延伸到半径至少为5弧分,增加了图片的NGC 3603作为一个缩小版本的R136/30 Dor地区。
The large-scale kinematics of young stars in the Milky Way disc: first results from SDSS-V
University of North Florida(北佛罗里达大学);University of Toronto(多伦多大学);KU Leuven(荷语鲁汶大学);Universidad de La Serena(拉塞雷纳大学);University of Colorado Boulder(科罗拉多大学博尔德分校);University of Virginia(弗吉尼亚大学);Chalmers University of Technology(查尔姆斯理工大学);New Mexico State University(新墨西哥州立大学);Moscow State University(莫斯科国立大学);Texas Christian University(得克萨斯基督教大学);University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Princeton University(普林斯顿大学)