Stellar pulsations distribute key ingredient for life
As Carl Sagan famously said, "We're made of star stuff"—but how do stars distribute their essential "stuff" for life into space? NASA's telescope on an airplane, SOFIA, is finding some answers by watching pulsating stars as they expand and contract, almost like-beating hearts.
SOFIA found that some Mira stars, late-stage red giants with especially powerful pulsations, can drive strong stellar winds that eject carbon-rich gas and dust out into interstellar space. On the other hand, stars with much weaker pulsations called semiregular stars, can't push the wind out as effectively. The Mira Stars are therefore responsible for distributing large amounts of carbon into the universe.
"We know that essential chemicals like carbon come from stars," said Kathleen Kraemer, a scientist at Boston College and lead author of the study. "But these strong pulsations help explain how carbon moves away from stars to where it can evolve into more complex structures, which in the case of Earth, ultimately became DNA, proteins and fats—life."
Previous research observed pulsating stars in other galaxies, like the Large Magellanic Cloud, but this research with SOFIA provides new insights into how carbon gets distributed in our own Milky Way galaxy.
The research was published in the Astrophysical Journal.
Source: Universities Space Research Association [August 06, 2020]
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