Abstract Details
| Name: Avrajit bandyopadhyay Affiliation: Indian Institute of Astrophysics Conference ID: ASI2018_701 Title : Connection between Globular clusters and Galactic halo Authors and Co-Authors : T Sivarani, Indian Institute of Astrophysics Abstract Type : Contributed Talk Abstract Category : Stars,ISM and the Galaxy Abstract : Recent progress in studies of globular clusters have shown that they are made of multiple generations of stars rather than being a simple population.They were also found to have different abundances compared to halo stars of similar metallicities indicating the complex evolutionary processes. Understanding of the origin of the abundance pattern is necessary to understand their formation scenario and the progenitor population in the context of hierarchical Galaxy formation models. Study of neutron-capture elements is among the most useful tools to study about the origin of the globular population.It helps in demarcating self enrichment from pre-enrichment.Here we present the abundances of key n-capture elements like Sr and Ba for some of the metal poor globular clusters in the Galactic halo.The star-to-star intra cluster scatter indicate local massive star nucleosynthesis while large inter cluster differences point to a different progenitor population that were formed in different systems and migrated to the Halo.We have used Carbon abundances to constrain its s/r-process origin.The Large spread in C abundance also points towards multiple populations.R-process contributions gives vital information on the original polluters of the birth cloud of GCs.R-process abundances are sensitive to the mass of the Pop-III supernovae and also masses of the subhalos where they have formed. Hence, it is an ideal diagnostic tool to understand their formation scenario in the context of hierarchical Galaxy formation models. We compare r-process abundances along with the light element anomalies to understand the nature of these first polluters. Globular clusters are supposed to have lost a large number of stars during their migration to the Galactic halo by several well studied processes like evaporation, disc shocking and dynamical friction. We have also studied a few stars in the Halo with globular cluster signatures from SDSS in high resolution using HESP to identify former cluster members now residing in the halo.This will tell us about the contribution of the globular clusters to the Halo. |