Tuesday , June 28 2022

A star with strange chemistry is out of town



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Image: The Subaru Telescope High Scattering Scattering.
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Credit: NAOJ

Astronomers have discovered a star in galactic galaxies in a chemical composition unlike any other planet in our galaxy. This chemical composition was seen in a small number of stars in dwarf galaxies orbiting the Milky Way. It follows that the star was part of a dwarf galaxy that merged into the Milky Way.

In LAMOST (Large Sky Space Multi-object Fiber Spectroscopy Telescope) survey data, the researchers noticed star J1124 + 4535 for its unusual chemical composition. Initial observations showed that J1124 + 4535, located in constellation The Big Dipper, had a low frequency of certain elements, such as magnesium. Tracking observations with high spectrograph scattering on the Subaru telescope confirmed the low levels of magnesium but found relatively high levels of europium. This is the first time this elementary relationship has been observed in the Milky Way star.

Stars form clouds of interstellar gas. The relationship of the parent cloud element gives a chemical signature observed on stars created in the cloud. So the stars formed close to have similar element ratios. The composition of J1124 + 4535 does not correspond to other stars in the Milky Way, indicating that it was created elsewhere.

Chemical signatures similar to J1124 + 4535 have been observed in several stars in dwarf galaxies that surround the Milky Way. Models and evolution of galaxies show that galaxies like the Milky Way are magnified by the absorption of neighboring dwarf galaxies. So it makes sense that J1124 + 4535 was born in a dwarf galaxy that now disappeared into the Milky Way.

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