STScI Research | STScI Discovery Seminar Series - Mayte Alfaro Cuello (STScI) and Paul Bennet (STScI) @stsciresearch6722 | Uploaded 2 years ago | Updated 9 minutes ago
This Discovery Seminar features talks by Mayte Alfaro Cuello on the Internal Kinematics of Outer Fields in Globular Clusters with HST and Paul Bennet on the Proper Motions of Globular Clusters in the Large Magellanic Cloud.
Tuesday, July 19 2022
Speaker: Mayte Alfaro Cuello
Title: Internal Kinematics of Outer Fields in Globular Clusters with HST
Abstract: Over the last 20 years, photometry and spectroscopy have revolutionized our understanding of globular clusters (GCs) and their multiple stellar populations, providing us with a wealth of information on their properties. Nonetheless, how the multiple populations form and evolve is still an open question. Kinematic and dynamic information is the key to find an answer, since their variation across the GCs radii can reveal the different formation mechanisms of the different populations. Due to long relaxation times, the external regions of GCs still retain signatures of the multiple population's formation mechanisms, thus the study of the external regions became critical for a complete kinetic understanding of GCs. I will present the first results of the proper motion study of the multiple populations of the central and external regions of the galactic GC M15 based on new and archival HST data.
Speaker: Paul Bennet
Title: The Proper Motions of Globular Clusters in the Large Magellanic Cloud
Abstract: We have obtained the proper motions for a comprehensive sample of 32 globular clusters (GCs) around the Large Magellanic Cloud (LMC) using a combination of Gaia eDR3 and Hubble Space Telescope data. Combining these proper motions with literature values for line-of-sight velocity and distance provides full 6D position-velocity data. This more than doubles the size of previous samples. This expanded data set allows new insights into the LMC and the kinematics of its GC population. I will present the results of this work, where in contrast to previous proper motion work, we find no evidence of kinematically distinct populations within the LMC’s GCs. We also explore the velocity dispersion and anisotropy of the GCs and the implications for the LMC.
This Discovery Seminar features talks by Mayte Alfaro Cuello on the Internal Kinematics of Outer Fields in Globular Clusters with HST and Paul Bennet on the Proper Motions of Globular Clusters in the Large Magellanic Cloud.
Tuesday, July 19 2022
Speaker: Mayte Alfaro Cuello
Title: Internal Kinematics of Outer Fields in Globular Clusters with HST
Abstract: Over the last 20 years, photometry and spectroscopy have revolutionized our understanding of globular clusters (GCs) and their multiple stellar populations, providing us with a wealth of information on their properties. Nonetheless, how the multiple populations form and evolve is still an open question. Kinematic and dynamic information is the key to find an answer, since their variation across the GCs radii can reveal the different formation mechanisms of the different populations. Due to long relaxation times, the external regions of GCs still retain signatures of the multiple population's formation mechanisms, thus the study of the external regions became critical for a complete kinetic understanding of GCs. I will present the first results of the proper motion study of the multiple populations of the central and external regions of the galactic GC M15 based on new and archival HST data.
Speaker: Paul Bennet
Title: The Proper Motions of Globular Clusters in the Large Magellanic Cloud
Abstract: We have obtained the proper motions for a comprehensive sample of 32 globular clusters (GCs) around the Large Magellanic Cloud (LMC) using a combination of Gaia eDR3 and Hubble Space Telescope data. Combining these proper motions with literature values for line-of-sight velocity and distance provides full 6D position-velocity data. This more than doubles the size of previous samples. This expanded data set allows new insights into the LMC and the kinematics of its GC population. I will present the results of this work, where in contrast to previous proper motion work, we find no evidence of kinematically distinct populations within the LMC’s GCs. We also explore the velocity dispersion and anisotropy of the GCs and the implications for the LMC.
