Discovery Of The Least ‘Metallic’ Stellar Structure In The Milky Way
Eddie Gonzales Jr. – MessageToEagle.com – The sun is made up of 98.5% hydrogen and helium, two light chemical elements, while the remaining 1.5% consists of other, heavier elements such as carbon, oxygen, and iron. The abundance of heavier elements in a star is called its metallicity, and varies from star to star.
Distribution of very dense groups of stars in the Milky Way, called globular clusters, superimposed on a map of the Milky Way compiled from data obtained with the Gaia Space Observatory. Each dot represents a cluster of a few thousand to several million stars, as in the insert image of the Messier 10 cluster. The color of the dots shows their metallicity, in other words, their abundance of heavy elements relative to the Sun. The C-19 stars are indicated by the light blue symbols. Credit: N. Martin / Strasbourg Astronomical Observatory / CNRS; Canada-France-Hawaii Telescope / Coelum; ESA / Gaia / DPAC
It now turns out that the Milky Way is home to a stellar structure uniquely comprising stars with extremely low metallicity, with a heavy element content 2,500 times lower than that of the sun. This is well below that of any other known stellar structure in the universe.
This discovery, made by an international team led by a CNRS researcher at the Strasbourg Astronomical Observatory (CNRS / University of Strasbourg), and involving scientists from the Galaxies, Stars, Physics and Instrumentation Laboratory (Paris Observatory—PSL / CNRS) and at the J-L Lagrange Laboratory (CNRS / Côte d’Azur Observatory), is published on January 5, 2022 in the journal Nature.
This group of stars all belongs to a stellar structure in the Milky Way called C-19. Not only does this discovery challenge our current understanding and models of the formation of these stellar groupings, which exclude the existence of structures composed only of such stars, it also opens a direct window to the very earliest ages of star formation and the development of stellar structures in the very distant past.
Since heavy elements were produced by successive generations of massive stars, the low metallicity of the C-19 stars shows that they were formed only a short time after the birth of the universe.
Written by Eddie Gonzales Jr. – MessageToEagle.com Staff
Related Posts
-
Juno Detects Jupiter’s Highest-Energy Ions
No Comments | Jun 17, 2021 -
Thick Disk Of Milky Way Is About 10 Billion Years Old – New Research
No Comments | Dec 12, 2019 -
Sun Could Unleash Devastating ‘Superflare’
No Comments | Dec 7, 2015 -
NGC 2768: A Luminous Seyfert Galaxy In The Contellation Ursa Major
No Comments | Dec 13, 2015 -
Mystery Of Bethlehem Star: It May Not Be A Star After All, Scientist Says
No Comments | Dec 2, 2016 -
Undead And Mythological Creatures Inspire New Names For Stars, Alien Planets
No Comments | Dec 16, 2015 -
New Horizons Spacecraft Captured The Sharpest Possible Pictures Of Ultima Thule
No Comments | Feb 25, 2019 -
NASA’s Spitzer Contributes With Observations Of Interstellar Object ‘Oumuamua
No Comments | Nov 16, 2018 -
NASA’s Cassini Spacecraft Has Begun Transmitting Latest Images Of Saturn’s Icy Moon – Enceladus
No Comments | Nov 1, 2015 -
What’s Up With ‘Niku’? Object’s Weird Orbit Puzzles Scientists
No Comments | Oct 25, 2016