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The Search for the Lost Siblings of the Sun | room



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The Sun Today, April 1

7, 2018, via NASA Solar Dynamics Observatory

Stars are typically born in star clusters, and probably our sun. The solar home cluster would have been torn apart relatively quickly as the cluster moved through the space of our Milky Way galaxy. Today, the stars of the sun would be scattered across our sky. But references to the siblings of the sun remain. For example, astronomers would expect every star in the birth chart to have the same chemical composition in the Sun. On April 17, 2018, astronomers in Australia and Europe announced that they had mapped the chemical profiles of 350,000 stars in our Milky Way galaxy. This was published in the first major public release of a Galactic Archeology Investigation of the GALAH survey. They relate somewhat fantastically to this information as the DNA of the stars. Among other information that comes from the GALAH data, they say, we might discover the lost siblings of our Sun.

The GALAH Survey was launched at the end of 2013. He uses sophisticated computer code to analyze spectroscopic data of the stars obtained with the HERMES spectrograph at the 3.9-meter Anglo-Australian Telescope at the Siding Spring Observatory of the Australian National University. Martin Asplund from the Australian National University led the latest analysis. He said that when it's done, GALAH will help reveal original star clusters for our Sun and over a million other stars. He said:

This survey allows us to trace the origin of stars and show astronomers how the universe went from hydrogen and helium – right after the Big Bang – to all the elements on Earth necessary for life ,

Gayandhi De Silva of the University of Sydney is the HERMES instrument scientist who led the groups working on the data release of April 17. He commented:

No other study has been able to measure as many elements for as many stars as GALAH

The GALAH team has spent more than 280 nights at the telescope since 2014 collecting all the data collected so far. These astronomers say their study will for the first time yield the following:

… a detailed understanding of the history of the galaxy.

Bottom line: On April 17, 2018, in the first large public data from the GALAH survey, astronomers in Australia and Europe announced that they had the chemical profiles of 350,000 stars in have mapped our Milky Way. The goal is to understand the history of our galaxy. On the way, they can find the lost siblings of our sun.

  Deborah Byrd


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