Unstable massive blue star disappeared in a dwarf galaxy

Analysis of the data of perennial observations of the dwarf galaxy Kinman have allowed astronomers to fix the case in her massive bright blue variable star. She could either collapsibility into a black hole without a supernova explosion, or become a star with lower luminosity, reported on the website of the European southern Observatory.

The study of massive stars allows scientists to understand a whole range of topics in astrophysics, such as stellar nucleosynthesis or the connection between supernovae and gamma ray bursts. One of the interesting problems is the study of the evolution of massive stars in environments with low-metallicity like dwarf galaxy. Numerical simulations predict that some very massive stars with low metallicity may at the end of his life to turn into unstable bright blue variables, and then explode as a supernova with the formation of the compact object — neutron star or black hole. To confirm and extend this hypothesis, new data, since the currently available observational data are insufficient.

A team of astronomers from Ireland, the USA and Chile, headed by Andrew Allan (Andrew Allan) of Trinity College, has published the results of observations of the dwarf galaxy Kinman (or PHL 293B), which is 75 million years of the Sun in the constellation Aquarius, belongs to a class of BCD galaxies and has a low metallicity. Observation of PHL 293B were conducted in 2019 with receivers ESPRESSO and X-shootermounted on the telescopes of the complex VLT (Very Large Telescope) in Chile.

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