Key Takeaways
1. Westerlund 2 is a star cluster located in the Gum 29 stellar nursery, about 20,000 light-years from Earth in the Carina constellation.
2. The cluster spans 6–13 light-years and contains many young, massive stars that emit powerful radiation, shaping the surrounding gas into striking structures.
3. New observations have revealed the complete population of brown dwarfs in Westerlund 2, which are objects that form like stars but do not have enough mass to be classified as stars.
4. NASA’s Webb Telescope, using NIRCam and MIRI, has provided detailed images that help locate stars with protoplanetary disks, aiding in understanding planet formation.
5. Westerlund 2 was previously featured in Hubble’s 25th anniversary image, but recent findings provide new insights into its stellar population and evolution.
Westerlund 2 is a cluster of stars located in a stellar nursery known as Gum 29. This nursery is situated about 20,000 light-years from Earth in the constellation Carina, which is also called the Keel. The sheer number of bright stars in Westerlund 2 makes the area appear festive and vibrant.
Structure of the Cluster
The entire cluster spans approximately 6–13 light-years across. While the region is filled with stars, the most brilliant part of the cluster is found near the top of the image. This section contains numerous young and massive stars that release powerful radiation into the surrounding gas. This radiation shapes striking walls and cavities filled with glowing red and orange gas. Additionally, the image reveals smaller stars that have just begun their shining phase, still enveloped by the gas and dust that birthed them.
New Discoveries
Westerlund 2 was previously highlighted as part of Hubble’s 25th anniversary image back in 2015. However, this latest observation uncovers something new: the complete population of brown dwarfs. Brown dwarfs are celestial objects that develop like stars but lack the necessary density and heat to be classified as stars. The smallest of these brown dwarfs may only have masses a few times that of Jupiter, and Webb’s findings also include objects that are around 10 times the mass of Jupiter.
Observational Advances
This remarkable image was produced using data from Webb’s Near-Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI). The information gathered is assisting astronomers in locating hundreds of stars that possess protoplanetary disks. Discovering these stars could provide valuable knowledge about the evolution of these disks and the formation of planets within environments dominated by young, massive star clusters.
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