Astronomers using the NASA/ESA Hubble Space Telescope collected information about about 500 stars as part of their research. Young Stars Ultraviolet Heritage Library (ULLYSES) Study as an Essential Standard.
This Hubble image shows a star-forming region containing giant young blue stars in the Tarantula Nebula. Image credits: NASA/ESA/STScI/Francesco Paresce, INAF-IASF Bologna/Robert O'Connell, UVA/SOC-WFC3/ESO.
“We believe the ULLYSES project is revolutionary and will have an impact across astrophysics, from exoplanets to the influence of massive stars on the evolution of galaxies, to understanding the early stages of the evolving universe. ” said Dr. Julia Roman-Duval, leader of the ULLYSES implementation team. She is an astronomer at the Space Telescope Science Institute.
“Apart from the specific purpose of research, stellar data can also be used in the field of astrophysics in ways we cannot yet imagine.”
Dr. Romain Duval and her colleagues studied 220 stars and combined their observations with information on 275 stars from the Hubble archive.
The study also includes data from some of the world's largest and most powerful ground-based telescopes and X-ray space telescopes.
The ULLYSES dataset consists of stellar spectra and includes information about each star's temperature, chemical composition, and rotation.
One of the star types being studied under ULLYSES is an ultra-hot, massive blue star.
They are a million times brighter than the Sun and glow intensely in ultraviolet light that can be easily detected by Hubble. Their spectra contain important information for diagnosing the speed of powerful winds.
The wind drives the evolution of galaxies, producing galactic seeds with the elements necessary for life. These elements are cooked in the star's fusion reactor and injected into space as the star dies.
ULLYSES targeted blue stars in nearby galaxies that are deficient in elements heavier than helium and hydrogen.
“Observations of Ulises are a stepping stone to understanding the first stars and their winds in the universe and how they influence the evolution of young host galaxies,” said Dr. Romain Duval.
Another category of stars in the ULLYSES survey are young stars with less mass than the Sun.
Although it is cooler and redder than the Sun, during its formative years it emits large amounts of high-energy radiation, including bursts of ultraviolet and X-rays.
As they are still growing, they are collecting material from the surrounding planet-forming disks of dust and gas.
Hubble's spectra contain important diagnostic information about the mass-gaining process, including the amount of energy this process releases into the surrounding planet-forming disk and nearby environment.
Intense ultraviolet radiation from young stars influences the evolution of these disks as they form planets and the potential habitability of newborn planets.
The target star is located in a star-forming region near the Milky Way.
The ULLYSES concept was designed by a panel of experts with the aim of using Hubble to provide a conventional set of stellar observations.
“ULLYSES was originally conceived as an observation program using Hubble's high-sensitivity spectrometer,” said Dr. Roman Duval.
“However, this research was greatly enhanced by community-driven complementary observations in collaboration with other ground-based and space-based observatories.”
“By covering such a wide area, astronomers can study the lives of stars in unprecedented detail and develop a more comprehensive picture of the properties of these stars and how they affect their environments. It becomes possible to draw.”
Source: www.sci.news
