The large amount of oxygen in the atmosphere of ancient stars discovered, An international team of astronomers has discovered a large amount of oxygen in the atmosphere of one of the oldest and most tired stars known as “primitive stars”. Scientists call it J0815 + 4729.
After hydrogen and helium, oxygen is the third most abundant element in the universe and is very important as a chemical basis for breathing and as a constituent of carbohydrates for all life forms on earth.
It is also a major element of the earth’s crust. However, there was no oxygen in the early universe. This results from fusion reactions that occur deep inside the most massive stars, which have a mass of about ten times the mass of the sun or greater. The large amount of oxygen in the atmosphere of ancient stars discovered.
To track the initial production of oxygen and other elements, the oldest surviving star must be examined. J0815 + 4729 is a star like that; this is more than 5,000 light years from the constellation Lynx.
This is due to the distribution of their rough balls around the Milky Way, in contrast to flat discs that are more familiar than young stars, which also include the sun.
Haloze stars like J0815 + 4729 are truly ancient stars that allow astronomers to check which elements were created at the beginning of the history of the universe.
The research team monitored J0815 + 4729 with a high-resolution Echelle (HIRES) spectrometer at the Keck observatory on the Keck I 10m telescope.
Data that took more than five hours to stare at stars last night was used to measure the abundance of 16 chemical species in the star’s atmosphere, including oxygen.
The primitive composition of the star shows that it formed in the first hundreds of millions of years after the Big Bang, possibly from material released from the first supernova.
HIRES data from Keck observatory stars show a very unusual chemical composition.
Even though the amount of carbon, nitrogen, and oxygen is relatively large – around 10, 8, and 3 percent of the amount measured in the sun – other elements such as calcium and iron have about a millionth of the amount in the sun.
Only a few such stars are known in our galaxy, but no one has such a large amount of carbon, nitrogen and oxygen compared to their iron content.
This type of star search involves a special project that searches for hundreds of thousands of star spectra to find some rare sources such as J0815 + 4729, followed by observations to measure their chemical composition.
This star was first identified using data from the Sloan Digital Sky Survey (SDSS), after which it was marked in 2017 by the IAC team with the Gran Canaria telescope in La Palma, Spain. We started 30 years ago at IAC to investigate the presence of oxygen in the oldest stars in the galaxy. these results have shown that this element was produced very much in the first generation of supernovae.
However, we cannot imagine that we will find a spectacular enrichment case like this star.