"In fact, it was thought that the MWTD was nothing but an extension of the thick disk and not an independent population with different astrophysical origins." 2) Carollo, scientist at the Astrophysical Observatory of Turin the first author of the article reporting the discovery, just published in The Astrophysical Journal. "It was almost 30 years that astronomers tried to solve this puzzle," said Dr. Stars belonging to the MWTD are also two times more metal-poor than those of the TD and have higher energy, a property that allows them to reach greater heights from the galactic plane. Indeed, stars that make up the TD have a rotational speed of about 180 km per second, while those of the MWTD rotate more slowly, at about 150 km per second. The new thick disk component, called the metal-weak thick disk (MWTD) or metal-poor thick disk, differs from the canonical one in the speed of rotation around the galactic center and its chemical composition. Daniela Carollo, researcher of the Italian National Institute for Astrophysics (INAF) of Turin, Italy, has revealed that the stars that make up the thick disk of the Milky Way belong to two distinct stellar populations with different characteristics and not to a single one, as has been thought for more than two decades. December 11, 2019: A new study on the kinematics and chemical composition of a sample of stars in the vicinity of the sun, led by Dr.References Gaia status and imagery for the period 2019-2013
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