Tomasz Nowakowski is a writer for the website Phys.org.
The cluster is called Messier 14. Credit: NOIRLAB.
Astronomers using the Hubble Space Telescope have observed a cluster of stars. The results of the observational campaign were published on January 7.
There are collections of tightly bound stars in the GCs. Astronomers think they are natural laboratories that can be used to study the evolution of stars and galaxies. The origin of GCs seems to be related to periods of intense star formation, so researchers could better understand the formation history and evolution of early type galaxies.
The GC is located near the Galactic plane in the farthest part of the universe. Although M14 is one of the most massive and Luminous GCs, it has not been comprehensively studied due to its high reddening and proximity to the Galactic plane.
The team of Astronomers led by Francesca D'Antona of Rome Observatory in Italy decided to use the Wide Field Camera 3 and the Ultraviolet andVisual Channel to conduct photometric observations of M14 in order to change this.
The researchers wrote that they had presented multi-band photometry of the massive GC NGC 6402 based on multi-band HST observations collected as part of GO-16283.
The team was able to get the map. It is a pseudo-two-color diagram that can be used to classify clusters.
There is a huge gap in the distribution of some light elements in multiple populations in M14. The authors used ChM to investigate this peculiarity.
According to the paper, the stars on the M14 chromosome map do not have the extreme chemical compositions seen in other massive GCs. The group of stars with extreme anomalies is known as the E stars.
The red side of the diagram shows a group of stars with higher metallicity. 2G stars show abundance patterns of gas processed at high temperatures between 30 and 100 million K. The results show that M14 is a type II cluster.
The study found that M14 does not have stellar populations with an extreme helium content, and the researchers think that this cluster has undergone two stages of 2G star formation.
The first one from matter was contaminated with p-processed elements and rich in helium, the second one was not as heavy and was not as light.
There are multiple populations in the globular cluster NGC 6402 (M14).
The Science X Network will be launched in 2022.
The Hubble Telescope investigated multiple stellar populations of the constellation Messier 14.
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