NGC 4590, more than 1,400 stars found in various evolutionary stages

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In summary, using the AstroSat spacecraft, astronomers have studied ultraviolet bright sources in the globular cluster NGC 4590. This cluster is a great place to observe the properties of individual stars in different evolutionary stages. Previous observations have found a significant number of blue and red horizontal branch stars in NGC 4590. However, it is unlikely that this cluster will be a target for the James Webb Space Telescope, as its instruments are designed to focus on the infrared part of the spectrum.
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Ultraviolet bright sources inspected in NGC 4590​

Using India's AstroSat spacecraft , astronomers have inspected ultraviolet (UV) bright sources in a globular cluster known as NGC 4590, which had previously been viewed with Hubble.
Globular clusters (GCs) are collections of tightly bound stars orbiting galaxies. Astronomers perceive them as natural laboratories enabling studies on the evolution of stars and galaxies. In particular, globular clusters could help researchers to better understand the formation history and evolution of early-type galaxies as the origin of GCs seems to be closely linked to periods of intense star formation.

GCs are great places to resolve and observe the properties of individual stars of various evolutionary stages. Studies show that sources with effective temperature higher than 7,000 K mostly contribute to the ultraviolet (UV) emission of GCs. Such UV bright sources in GCs may be identified, for instance, as blue horizontal branch stars (BHBs), extremely blue horizontal branch stars (EHBs), or post-asymptotic giant branch stars (pAGBs).

At a distance of about 33,900 light years, NGC 4590 (also known as Messier 68) is a very metal-poor galactic GC in the Milky Way's northern hemisphere. The cluster is estimated to be 11.2 billion years old and its line of sight is at a level of 0.05. Previous observations of NGC 4590 have found that it hosts a significant number of BHBs and red horizontal branch stars (RHBs).

Will this area be a target for JWST? Or, probably not based on the following:
Hubble’s main focus is on visible and ultraviolet light. Its instruments can observe a small portion of the infrared spectrum from 0.8 to 2.5 microns, but not to the extent that James Webb can. Instead it focuses its unique ultraviolet (0.1 to 0.4 micron) capabilities on work that cannot be done from the ground and its visible (0.4 to 0.8 micron) light instruments on producing the high resolution images we are most familiar with

JWST has been designed to focus on the infrared part of the spectrum from 0.6 (red light) to 28 microns (infrared). This means it won’t be able to see in ultraviolet light like Hubble, but will be able to focus on infrared bright objects like extremely distant galaxies
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Related to NGC 4590, more than 1,400 stars found in various evolutionary stages

1. What is NGC 4590?

NGC 4590 is a globular cluster located in the constellation Virgo. It is home to more than 1,400 stars in various stages of evolution.

2. How was NGC 4590 discovered?

NGC 4590 was first discovered by astronomer William Herschel in 1784. It was later catalogued as M68 by Charles Messier in 1780.

3. What is a globular cluster?

A globular cluster is a densely packed group of stars that are gravitationally bound together. They are typically found in the outer regions of galaxies and contain some of the oldest stars in the universe.

4. What can studying NGC 4590 tell us about the universe?

Studying NGC 4590 can provide valuable insights into the formation and evolution of galaxies. The different stages of evolution of the stars within the cluster can also give us a better understanding of the processes that lead to the creation of stars and planets.

5. How do scientists study NGC 4590?

Scientists use various techniques to study NGC 4590, including spectroscopy and photometry. These techniques allow them to analyze the light emitted by the stars in the cluster and gather information about their chemical composition, age, and other properties.

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