Scientists have found a star with such a small mass.
The researchers took the power of speech: in our Galaxy have found something very ancient and mysterious.
Recently researchers from Monash University in Australia found itself is ancient star in the milky Way galaxy. Her age is 13.5 billion years old. Scientists called the discovery of 2MASS J18082002-5104378 B.
As it turned out, she remained unnoticed because of the tiny size and dull looking space. To see the old star managed only thanks to her bright neighbor larger. In addition, the researchers found out her age through detailed spectral analysis.
The fact that the first generation of stars formed after the Big Bang, consisted of light elements like hydrogen, helium and lithium. Then they gradually increased the number of metals. Thus, the “metallicity” of stars was a good indicator for determining their age.
According to scientists, 2MASS J18082002-5104378 B refers to the second generation of stars. Check that its mass is only 10% of the mass of the Sun, and the amount of metals in it is 10% of all the metals of our planet.
Astrophysicist Andrew Casey admitted that for the first time has discovered a star with such a tiny mass and tiny amounts of metals. Also there is the assumption that in our galaxy there could be other ancient stars, but they will not be easy to detect because of their small size.
“These stars are extremely rare – the process of finding them like finding needles in a haystack. But due to the huge amount of data collected by ground and space telescopes, we are more than ever close to understanding how stars formed in the early Universe,” said Casey.
This discovery provides the opportunity to learn more about the formation of stars in the Universe. As one of the oldest stars are located in the thin disk of the milky Way, the question of the age of our galaxy re-opened. Perhaps she is much older than previously thought.