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Why is this weird, metallic star hurtling out of the Milky Way? 5nvklj





Why is this weird, metallic star hurtling out of the Milky Way? 9tpt39

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Why is this weird, metallic star hurtling out of the Milky Way?

Dragon
Dragon
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Why is this weird, metallic star hurtling out of the Milky Way? Empty Why is this weird, metallic star hurtling out of the Milky Way?

Post by Dragon Wed Aug 04, 2021 2:51 am

About 2,000 light-years away from Earth, there is a star catapulting toward the edge of the Milky Way.

This particular star, known as LP 40−365, is one of a unique breed of fast-moving stars—remnant pieces of massive white dwarf stars—that have survived in chunks after a gigantic stellar explosion.

"This star is moving so fast that it's almost certainly leaving the galaxy…[it's] moving almost two million miles an hour," says JJ Hermes, Boston University College of Arts & Sciences assistant professor of astronomy.

But why is this flying object speeding out of the Milky Way?

Because it's a piece of shrapnel from a past explosion—a cosmic event known as a supernova—that's still being propelled forward.


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Why is this weird, metallic star hurtling out of the Milky Way? 334pu7m
Dragon
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Why is this weird, metallic star hurtling out of the Milky Way? Empty Re: Why is this weird, metallic star hurtling out of the Milky Way?

Post by Dragon Wed Aug 04, 2021 2:53 am



LP 40-365: An unusual white dwarf star may be a surviving remnant of a subluminous Type Ia supernova

This animation shows how astronomers imagine the story of LP40-365 developed over the past 30 million years, condensed in half a minute: The white dwarf accretes material from a close companion until it exceeds its mass limit and explodes as a supernova.

The imperfect explosion shoots out a shrapnel of unburnt core material towards the Milky Way galaxy. Finally, the shrapnel is observed as a fast moving, very low mass, peculiar white dwarf zooming past the solar neighborhood.

The closest approach to the Sun was about 500,000 years ago at a distance of merely 300 parsecs.


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Why is this weird, metallic star hurtling out of the Milky Way? 334pu7m

    Current date/time is Thu Sep 23, 2021 3:56 am