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Globular clusters are large collections of old stars that are orbiting the core of a galaxy. Our Milky Way Galaxy has about 160 known clusters, with perhaps more to be discovered. We first accumulated the necessary parameters for 16…

高能天体物理现象 · 物理学 2017-12-22 Hambeleleni Ndiyavala , Christo Venter , Petrus Paulus Kruger

By matching infrared-selected, massive young stellar objects (MYSOs) and compact HII regions in the RMS survey to massive clumps found in the submillimetre ATLASGAL survey, we have identified ~1000 embedded young massive stars between…

The estimated total number of Milky Way globulars is 160+-20. The question of whether there are any more undiscovered globular clusters in the Milky Way is particularly relevant with advances in near and mid-IR instrumentation. This…

天体物理学 · 物理学 2009-11-13 R. Kurtev , V. D. Ivanov , J. Borissova , S. Ortolani

We present a new updated catalogue of Galactic and extragalactic symbiotic stars (SySts). Since the last catalogue of SySts (Belczynski et al. 2000), the number of known SySts has significantly increased. Our new catalogue contains 316…

太阳与恒星天体物理 · 物理学 2017-02-01 Stavros Akras , Lizette Guzman-Ramirez , Marcelo Leal-Ferreira , Gerardo Ramos-Larios

We extract light curves for 4554 objects with $9<G<19$ in the K2 superstamp observations of the globular cluster M4, including 3784 cluster members, and search for variability. Among cluster member objects, we detect 66 variables, of which…

太阳与恒星天体物理 · 物理学 2019-09-25 Joshua J. Wallace , Joel D. Hartman , Gaspar A. Bakos , Waqas Bhatti

Many observable properties of globular clusters (GCs) provide valuable insights for unveiling the hierarchical assembly of their host galaxy. For the Milky Way (MW) in particular, GCs from different accreted satellite galaxies show distinct…

星系天体物理 · 物理学 2024-04-05 Yingtian Chen , Oleg Y. Gnedin

We have compiled the first all-sky mid-infrared variable-star catalog based on Wide-field Infrared Survey Explorer (WISE) five-year survey data. Requiring more than 100 detections for a given object, 50,282 carefully and robustly selected…

太阳与恒星天体物理 · 物理学 2018-08-08 Xiaodian Chen , Shu Wang , Licai Deng , Richard de Grijs , Ming Yang

Context: Debris discs orbiting young stars are key to understand dust evolution and the planetary formation process. We take advantage of a recent membership analysis of the 30 Myr nearby open cluster IC 4665 based on the Gaia and DANCe…

太阳与恒星天体物理 · 物理学 2020-09-30 Núria Miret-Roig , Nuria Huélamo , Hervé Bouy

We utilize 16 band Hubble Space Telescope (HST) observations of 18 lensing clusters obtained as part of the Cluster Lensing And Supernova survey with Hubble (CLASH) Multi-Cycle Treasury program to search for $z\sim6-8$ galaxies. We report…

Detailed studies of Be stars in environments with different metallicities like the Magellanic Clouds or the Galactic bulge are necessary to understand the formation and evolution mechanisms of the circumstellar disks. However, a detailed…

天体物理学 · 物理学 2009-11-13 B. E. Sabogal , R. E. Mennickent , G. Pietrzyński , J. A. García , W. Gieren , Z. Kolaczkowski , .

We present the catalog of star clusters found in the area of about 5.8 square degree in the central regions of the Large Magellanic Cloud. It contains data for 745 clusters. 126 of them are new objects. For each cluster equatorial…

天体物理学 · 物理学 2007-05-23 G. Pietrzynski , A. Udalski , M. Kubiak , M. Szymanski , P. Wozniak , K. Zebrun

The Magellanic System (MS) encompasses the nearest neighbors of the Milky Way, the Large (LMC) and Small (SMC) Magellanic Clouds, and the Magellanic Bridge (MBR). This system contains a diverse sample of star clusters. Their parameters,…

We use the age-metallicity distribution of 96 Galactic globular clusters (GCs) to infer the formation and assembly history of the Milky Way (MW), culminating in the reconstruction of its merger tree. Based on a quantitative comparison of…

星系天体物理 · 物理学 2018-09-05 J. M. Diederik Kruijssen , Joel L. Pfeffer , Marta Reina-Campos , Robert A. Crain , Nate Bastian

We are continuing a J, K and narrow-band imaging survey of 300 square degrees of the plane of the Galaxy, searching for new Wolf-Rayet stars. Our survey spans 150 degrees in Galactic longitude and reaches 1 degree above and below the…

Only four globular cluster planetary nebulae (GCPN) are known so far in the Milky Way. About 50 new globular clusters have been recently discovered towards the Galactic bulge. We present a search for planetary nebulae within 3 arcmin of the…

太阳与恒星天体物理 · 物理学 2019-10-16 Dante Minniti , Bruno Dias , Matías Gómez , Tali Palma , Joyce B. Pullen

The Magellanic System (MS), consisting of the Large Magellanic Cloud (LMC), the Small Magellanic Cloud (SMC) and the Magellanic Bridge (MBR), contains diverse sample of star clusters. Their spatial distribution, ages and chemical abundances…

The results of the searching on the bases of GPS UKIDSS survey's data of dense compact stellar clusters in the vicinity of 20 YSOs with high and middle masses are presented. Totally we have revealed clusters in 13 areas. Around 5 objects…

太阳与恒星天体物理 · 物理学 2015-12-29 N. M. Azatyan , E. H. Nikoghosyan

Recent observations of young embedded clumpy clusters and statistical identifications of binary star clusters have provided new insights into the formation process and subsequent dynamical evolution of star clusters. The early dynamical…

星系天体物理 · 物理学 2021-07-08 R. Darma , M. I. Arifyanto , M. B. N. Kouwenhoven

An overview of our current understanding of the formation and evolution of star clusters is given, with main emphasis on high-mass clusters. Clusters form deeply embedded within dense clouds of molecular gas. Left-over gas is cleared within…

星系天体物理 · 物理学 2015-05-14 Soeren S. Larsen

Observations suggest that there is a significant fraction of O-stars in the field of the Milky Way that appear to have formed in isolation or in low mass clusters ($<$100 $M_\odot$). The existence of these high-mass stars that apparently…