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posted by martyb on Tuesday November 01 2016, @06:07PM   Printer-friendly
from the big-and-bright dept.

NASA has found fast-spinning and orange "pumpkin stars" that appear to be the squashed result of ongoing binary mergers:

Astronomers using observations from NASA's Kepler and Swift missions have discovered a batch of rapidly spinning stars that produce X-rays at more than 100 times the peak levels ever seen from the sun. The stars, which spin so fast they've been squashed into pumpkin-like shapes, are thought to be the result of close binary systems where two sun-like stars merge. "These 18 stars rotate in just a few days on average, while the sun takes nearly a month," said Steve Howell, a senior research scientist at NASA's Ames Research Center in Moffett Field, California, and leader of the team. "The rapid rotation amplifies the same kind of activity we see on the sun, such as sunspots and solar flares, and essentially sends it into overdrive."

The most extreme member of the group, a K-type orange giant dubbed KSw 71, is more than 10 times larger than the sun, rotates in just 5.5 days, and produces X-ray emission 4,000 times greater than the sun does at solar maximum. These rare stars were found as part of an X-ray survey of the original Kepler field of view, a patch of the sky comprising parts of the constellations Cygnus and Lyra.

Rapidly Rotating, X-ray Bright Stars in the Kepler Field (DOI: 10.3847/0004-637X/831/1/27) (DX) (arXiv:1608.07828)


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  • (Score: 4, Funny) by Azuma Hazuki on Tuesday November 01 2016, @07:55PM

    by Azuma Hazuki (5086) on Tuesday November 01 2016, @07:55PM (#421376) Journal

    Did they find a Spice Star, an Ugg-boots Star, and a Basic White Chick star nearby? ...though the last one may be hard to find as it can't even/

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  • (Score: 2) by takyon on Tuesday November 01 2016, @09:33PM

    by takyon (881) <takyonNO@SPAMsoylentnews.org> on Tuesday November 01 2016, @09:33PM (#421410) Journal

    They never find any black dwarf stars. What's up with that?

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