By analyzing the info from ESA’s Gaia satellite, astronomers have detected two new younger open clusters. The newfound clusters, designated Casado 82 and Casado-Hendy 1, are positioned in a close-by primordial group of open clusters. The discovering is reported in a paper printed November 23 on arXiv.org.
Open clusters (OCs), shaped from the identical large molecular cloud, are teams of stars loosely gravitationally sure to one another. Thus far, greater than 1,000 of them have been found within the Milky Way, and scientists are nonetheless searching for extra, hoping to seek out quite a lot of these stellar groupings. Increasing the checklist of recognized galactic open clusters and finding out them intimately may very well be essential for bettering our understanding of the formation and evolution of our galaxy.
At a distance of about 5,900 gentle years, NGC 6871 is a younger, giant, and wealthy OC with some substructure and at the very least two cores. Earlier observations of this cluster have discovered that it’s a part of the HC primordial group of OCs—a star-forming complicated containing a number of younger OCs, together with Teutsch 8, FSR 198 and Biurakan 2.
Lately, a crew of astronomers led by Juan Casado of the Autonomous College of Barcelona, Spain, has investigated this primordial group of OCs by analyzing the info from Gaia’s Information Launch 3 (DR3), with a view to shed extra gentle on its properties. As a part of this examine, they found two new OCs.
“The preliminary goal of the current work was to revisit the primordial group of NGC 6871 with a view to make the most of Gaia DR3 outcomes to acquire a greater characterization of this star formation complicated and the person part clusters. Whereas doing so, we have now recognized two new OCs (Casado 82 and Casado-Hendy 1) that we characterize intimately,” the researchers defined.
The 2 new OCs include 39 member stars every and are positioned some 6,200 light years away. Their radial velocities have been measured to be round -23 km/s. The radii of Casado 82 and Casado-Hendy 1 have been calculated to be 9 and eight.1 arcminutes, respectively.
The examine discovered that Casado 82 is roughly 6.6 million years previous, whereas Casado-Hendy 1 is about 300,000 years youthful. The total mass of Casado 82 was estimated to be 85 solar masses, which is a few eight solar lots lower than within the case of Casado-Hendy 1.
On the subject of metallic abundances, the outcomes point out that they’re very related for the 2 OCs—at a degree of 0.015 and 0.017 for Casado 82 and Casado-Hendy 1, respectively. It was famous that these values are near that of the sun and likewise recommend an identical composition of the 2 clusters.
Furthermore, the analysis discovered that each one the members of the HC primordial group that incorporates Casado 82 and Casado-Hendy 1 have been born in the identical star formation complicated. The outcomes additionally present that NGC 6871 appears to be disintegrating, and the primordial group members seem like dispersing out quickly.
Summing up the findings, the authors of the paper famous that the detection of Casado 82 and Casado-Hendy 1 means that many extra new OCs could also be found within the close to future by analyzing the Gaia information.
Extra data:
Juan Casado et al, Discovery and outline of two younger open clusters within the primordial group of NGC 6871, arXiv (2022). DOI: 10.48550/arxiv.2211.12843
Journal data:
arXiv
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