Djorgovski 2 is a moderately metal-poor globular cluster, study finds

phys.org | 6/3/2019 | Staff
tanikaki (Posted by) Level 3
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Three-color image of the Djorgovski 2 field from HST data. Credit: Ortolani et al., 2019.

Based on data from the Hubble Space Telescope (HST) and from the Very Large Telescope (VLT), astronomers have gained insights into a galactic globular cluster known as Djorgovski 2. Besides determining fundamental parameters of the object, the new research classified Djorgovski 2 as a moderately metal-poor globular cluster. The findings are presented in a paper published June 27 on arXiv.org.

Observations - Clusters - GCs - Milky - Way

Observations of globular clusters (GCs) in the Milky Way galaxy are of high importance for astronomers as they are among the oldest objects in the universe. Therefore, they are perceived as natural laboratories for the study of stellar evolution processes.

Discovered in 1978, Djorgovski 2 (also known as ESO 456-SC38) is a globular cluster located in the galactic bulge, one of the closest GCs to the center of the Milky Way. Given their location, such clusters as Djorgovski 2 are among the oldest known to date. This could mean that they might have witnessed the entire history of the Milky Way, and could therefore be crucial in advancing the knowledge about our home galaxy.

Group - Astronomers - Sergio - Ortolani - University

So a group of astronomers led by Sergio Ortolani of University of Padua, Italy, decided to investigate Djorgovski 2. They analyzed the available observational data regarding this cluster, mainly photometry from HST and VLT. The analysis was complemented by data from ESA's Gaia satellite.

"We analyzed ESO456-SC38 based on Hubble Space Telescope photometry, with the filters F606W from ACS, F110W...
(Excerpt) Read more at: phys.org
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