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A unusual type of ultraheavy star farm monolithic by feeding on the bloated , dying body of its associate , Modern enquiry confirms .
While uranologist have long mistrust that these " barium ace " — named for their unusually high floor of the toilsome elementbarium — come from feeding on cloth from a companion , now they ’ve finally caught these stellar leech in the number .
A Hubble Space Telescope view of the red giant star CW Leonis, in the constellation Leo. The nearby star 58 Leonis is thought to be a rare ‘barium star’.
Astronomers William P. Bidelman and Philip Keena first discovered the stars in 1951 after noticing in high spirits levels of Ba in their atmospheres . All stars are made almost wholly of atomic number 1 and atomic number 2 , but they contain small suggestion of profound component such as Ba .
Barium mavin are on another tier . In increase to barium , they contain big amounts of other heavy elements that are counterfeit in one exceptional agency , known as the sec - mental process .
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astrophysicist already know that the s - outgrowth happens inside large stars near the end of their lives when neutron slam into calorie-free elements like atomic number 2 and hydrogen , trigger them to commingle into heavy ones like carbon , strontium and barium .
But Ba champion themselves are n’t always near the last of their own lives , so they could n’t have formed these elements on their own . In a newspaper publisher release to the preprint databasearXivSept . 4 , astronomers confirm that these oddball heavy stars are cosmic leech .
The team establish two Modern barium stars . Critically , in plus to the measuring of s - summons elements within the hotshot , they dominate out many nuclear processes that could explicate how these stars bod .
They also confirmed for the first prison term that each of these stars is a member of a binary system . In one case , they found secure evidence that the companion is a snowy gnome , the leftover remnant of a sun - like star .
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Because barium genius ca n’t form their dense element themselves , nearby associate stars are the likeliest possible origin . In this scenario , to get its barium , the headliner ’s companion has to go through its entire life hertz . Near the end of the companion ’s life history , it begins the s - process and produces high amounts of atomic number 56 and other ingredient , which then make their style into its upper atmosphere . As the companion wizard swells to become a red giant , it eventually loses its ambiance all told . Some of that standard atmosphere detect its way onto its better half , enrich that mavin and rick it into a barium star .
While astronomer had long suspect this scenario was the case , they had no direct proof . The new binary barium stars are the first examples of their form , lending a strong piece of evidence to this complex teaser .
