Chemical Composition of Globular Clusters of Milky Way Subsystems from Gaia DR2 Data

Titarenko 1 , A. Recio-Blanco 1 , P. Hayden 1 ,2 ,3 and G. Guiglion 4 ,1. Received: 26 June Accepted: 8 November Chemical abundance dating methods open new paths for temporal evolution studies of the Milky Way stellar populations. For thick disc stars, the correlation has a different zero point and probably a steeper trend with age, reflecting the different chemical evolution histories of the two disc components. Since the advent of stellar astrophysics, the estimation of stellar ages has been a crucial challenge with many fundamental implications. Starting with the historical debate around the age of our Sun, stellar ages have been recognised as clocks of the evolving Universe that we wish to understand.

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The AMBRE Project: [Y/Mg] stellar dating calibration with Gaia.

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Click here to close this overlay, or press the “Escape” key on your keyboard. Its membership of about 7, individuals also includes physicists, mathematicians, geologists, engineers, and others whose research and educational interests lie within the broad spectrum of subjects comprising contemporary astronomy. The mission of the AAS is to enhance and share humanity’s scientific understanding of the universe. The Institute of Physics IOP is a leading scientific society promoting physics and bringing physicists together for the benefit of all.

It has a worldwide membership of around 50 comprising physicists from all sectors, as well as those with an interest in physics. It works to advance physics research, application and education; and engages with policy makers and the public to develop awareness and understanding of physics. Its publishing company, IOP Publishing, is a world leader in professional scientific communications.

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Dating the Evaporation of Globular Clusters

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January 13, A single bright star in the constellation of Indus, visible from the southern hemisphere, has revealed new insights on an ancient collision that our galaxy the Milky Way underwent with another smaller galaxy called Gaia-Enceladus early in its history. Stars carry “fossilized records” of their histories and hence the environments in which they formed.

Their results are published in the journal Nature Astronomy. Launched in , TESS is surveying stars across most of the sky to search for planets orbiting the stars and to study the stars themselves. When combined with data from the European Space Agency ESA Gaia Mission, the detective story revealed that this ancient star was born early in the life of the Milky Way, but the Gaia-Enceladus collision altered its motion through our Galaxy. That is how we have been able to use the asteroseismically-determined age to place new limits on when the Gaia-Enceladus event occurred.

Co-author Dr. Ted Mackereth, also from Birmingham, said: “Because we see so many stars from Gaia-Enceladus, we think it must have had a large impact on the evolution of our Galaxy. Understanding that is now a very hot topic in astronomy, and this study is an important step in understanding when this collision occurred. Bill Chaplin added: “This study demonstrates the potential of asteroseismology with TESS, and what is possible when one has a variety of cutting-edge data available on a single, bright star”.

The research clearly shows the strong potential of the TESS programme to draw together rich new insights about the stars that are our closest neighbours in the Milky Way. Explore further.

Age dating of an early Milky Way merger via asteroseismology of the naked-eye star ν Indi

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Figure 1. The dramatic tail of the Tadpole Galaxy Arp is also the result of a gravitational tug. Credit: NASA. The most ancient stellar populations in our galaxy are being ripped apart. Globular clusters — massive gravitationally bound collections of hundreds of thousands of stars — have occupied the Milky Way halo for billions of years.

Studying globular clusters can help us understand not only how our galaxy formed, but also how it has evolved over the history of the universe. As the stars in globular clusters interact gravitationally, some gain enough kinetic energy to be ejected from the cluster entirely. The shrinking of globular clusters through this process is called evaporation. When the ejected stars escape the gravitational confines of the cluster, the gravitational pull of the Milky Way starts to take over.

As the cluster orbits the galactic center, it experiences tidal forces. Much like an unwitting spacefarer approaching a black hole , globular clusters get stretched out by these tidal forces, stringing those escaped stars into a tidal tail or stream see Figure 1. We see these tidal tails in many globular clusters, but the question remains: How can we figure out when the tidal disruption began?

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Publication date. 31/03/ Publisher. Cambridge University Press (CUP). Title​. Proceedings of the International Astronomical Union. Journal ISSN.

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