In December 2023, the Hubble Space Telescope completed its largest program since it was launched in 1990.With this program, Hubble observed 500 individual stars over three years — and scientists are now ready to explore this data.
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The Hubble Space Telescope's extensive research project is called the Ultraviolet Legacy Library of Young Stars as Essential Standards, or ULLYSES. ULLYSES officials considered Hubble to be the only active telescope capable of achieving such a groundbreaking endeavor.
These dazzling infrared observations will last long after Easter, but will keep researchers busy for decades, as they offer new insights into star formation, evolution and the impact they have on environment .
The ULLYSES team used Hubble to initially study 220 stars, then looked through the space telescope's archive to identify observations of another 275 stars. The researchers also incorporated star data from a variety of other space telescopes and observatories on the ground.
The complete ULLYSES dataset consists of stellar spectra that contain information about each star's temperature, chemical composition and the speed at which it rotates.
The ULLYSES team is interested in superhot, massive blue stars that can be millions of times brighter than sun . These hot stars shine brightly in ultraviolet light, which means Hubble can easily spot them.
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Massive blue stars live fast and die young, quickly burning the fuel they need for their built-in nuclear fusion processes and creating “metals,” the term astronomers to describe elements heavier than hydrogen and helium. Hydrogen and helium are the elements that stars are primarily made of early in their lives.
Stellar spectra of massive blue stars can reveal details about the speeds of the powerful stellar winds flowing out of them.
The ULLYSES project also focused on young stars that are cooler, smaller, and redder than the Sun in color (and size) spectrum. These stars were located closer to home, in active star-forming regions of Milky Way Galaxy .
Hubble observations collected for ULLYSES could help scientists better understand the processes by which these young stars absorb matter from their surroundings to achieve the mass needed to trigger the nuclear fusion of hydrogen into helium. By initiating this process, the young star will become a fully developed star.
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This could also reveal the impact these stars have on the disks surrounding them, which will eventually form planets. So studying the research could potentially help scientists better understand which systems are most suitable for searching for life.
Source: space.com
