Four new open clusters detected in the Cygnus Cloud

Four new open clusters detected in the Cygnus Cloud
AllWISE-W3 image showing the spatial distribution of the newly found OCs (yellow dots: from QC 1 to QC 4) together with the OCs listed by Kharchenko et al. (2013) (pink dots) and Cantat-Gaudin & Anders (2020) (blue dots) in the Galactic maps. The single yellow square at the bottom-left is the known cluster NGC 7062. Credit: Qin et al., 2020.

By analyzing the data from ESA's Gaia satellite, Chinese astronomers have discovered four new open clusters in the Cygnus Nebula Cloud. The newfound clusters, designated QC1 to QC 4, are located between 4,100 and 7,600 light-years away. The finding is reported in a paper published August 17 on

Open clusters (OCs) are groups of stars loosely gravitationally bound to each other, which form from the same giant molecular cloud,. So far, more than 1,000 of them have been discovered in the Milky Way, and scientists are still looking for more, hoping to find a variety of these stellar groupings. Expanding the list of known galactic open clusters could be crucial for improving the understanding of the formation and evolution of the galaxy.

Now, a team of astronomers led by Songmei Qin of the China West Normal University, reports the finding of four new galactic open clusters. The finding is based on the precise astrometry and photometry data from Gaia DR2 (Data Release 2) as part of the study of nearby molecular clouds.

The researchers have investigated the Cygnus Cloud area, which is a typical star-forming area relatively nearby. It hosts numerous young open clusters and HII regions (containing clouds of ionized atomic hydrogen), however, due to the presence of dust with heavy and non-uniform absorption and reddening, it is assumed that it may contain numerous open clusters still undetected.

"Based on the reliable Gaia DR2 data, we have identified four new open clusters named QC1, QC2, QC 3 and QC 4 in the east part of Cygnus cloud region," the astronomers wrote in the paper.

The researchers found that the selected member stars of the four newfound clusters show apparent proper motion overdensity in the corresponding vector-point diagram, relatively central concentration in the 3-D and clear main sequence feature on the color-magnitude diagram.

According to the paper, the closest to the Earth from the newly detected four is QC1, with a distance of about 4,100 light-years. The remaining three are located at a similar distance of some 7,600 light-years away. The new OCs have core radii between 2.23 and 3.57 arcmins, and reddening ranging from 0.552 to 0.756 mag.

By analyzing data from some other study, Qin's team assumes that the four newfound are very young. QC2 and QC3 are estimated to be between 4 and 5 million years old, while the age of QC1 and QC4 remains to be determined.

In concluding remarks, the authors of the paper emphasized that further observations are required in order to fully investigate the properties and nature of the OCs described in the study.

"Especially more spectroscopic for the member stars will be of prime importance to determine the dynamical and chemical nature of these clusters," the researchers explained.

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More information: Discovery of Four New Clusters in the Cygnus Cloud, arXiv:2008.07164 [astro-ph.SR]

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Citation: Four new open clusters detected in the Cygnus Cloud (2020, August 25) retrieved 3 December 2020 from
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