We develop a model-independent framework to quantify phase-space “crystallization”, the degree of ordered radial and kinematic substructure, in 79 Galactic globular clusters using the Gaia EDR3-based membership catalogue of E. […]
globular clusters
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Interstellar, Status Report
Tracing Nitrogen Enrichment Across Cosmic Time With JWST
We present a comprehensive analysis of the nitrogen-to-oxygen (N/O) abundance ratio in star-forming galaxies at redshift z~1-6, with a median redshift of z=2.7, using deep JWST/NIRSpec spectroscopy.
![ChM diagram of M dwarfs in 47 Tucanae from JWS T-HS T photometry (grey dots). Spectroscopic targets observed with NIRSpec@JWS T are represented with filled coloured circles. Targets with no available mF322W2 from NIRCam@JWS T are plotted with ∆C F606W,F814W,F322W2=0.00 as empty circles. Different colors have been used for stars associated with different stellar populations on the ChM, specifically: first population (1P) stars are colored in red, second population ones have been colored in orange (2Pa), cyan (2Pb) and blue (2Pe). The [O/Fe] abundance vs. the ∆F606W,F814W and ∆C F606W,F814W,F322W2 values is shown in the upper and right panels, respectively. For each population, we plot the average values and the associated error. -- astro-ph.GA](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/06/A-JWST-project-on-47-Tucanae.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Interstellar, Status Report
A JWST Project on 47 Tucanae. NIRSpec Spectroscopy of Multiple Populations Among M dwarfs
We present the first spectroscopic estimates of the chemical abundance of M dwarf stars in a globular cluster (GC), namely 47 Tucanae. By exploiting NIRSpec on board the James Webb […]
Posted inAstronomy & Telescopes, Brown Dwarfs, Status Report
A JWST Project On 47 Tucanae. Overview, Photometry And Early Spectroscopic Results Of M dwarfs And Observation Of Brown Dwarfs
The James Webb Space Telescope (JWST) observations have been demonstrated to be efficient in detecting globular clusters’ (GCs) multiple stellar populations in the low-mass regime of M dwarfs.