A star with an atmosphere composed almost completely of
oxygen has been discovered, a finding that doesn’t fit current
scientific theories on what exactly happens when stars die. It has been
given the name Dox.
The discovery was noted in a research paper published in
Science Magazine,
and astronomers noted that the composition of the white dwarf’s
atmosphere — which is 99.9 percent oxygen and contained no signs of
hydrogen or helium — is “surprising.” The Earth, for comparison, has an
atmosphere composed of roughly 21 percent oxygen,
Wired.Co.Uk reports.
“After oxygen, the next most abundant elements in its
atmosphere are neon and magnesium, but these are lower by a factor of
≥25 by number,” researchers wrote. That composition is unique of the
32,000 white dwarfs known to man. Still, the star could provide clues on
the evolution of stars.
“We had no idea anything like it could even exist; that made
it all the more difficult to find,” Kepler de Souza Oliveira, a
researcher at the Federal University of Rio Grande do Sul in Brazil,
told
Popular Mechanics. The findings are “incredibly unexpected.”
White dwarfs are known to the astronomy world as the
old-timers of the universe. Most stars — in fact, all but 3 percent —
end up as white dwarfs. They are super dense and are the thought to be
the end result of a dying star. They usually spew out hydrogen and
helium. Dox, which is just a bit bigger than the Earth, has 60 percent
of the mass of our sun, according to Popular Mechanics.
The star presents some mysteries for astronomers. Namely,
they aren’t generally known to be made of almost one singular element,
and oxygen is usually found in much heavier white dwarfs — about double
the weight of Dox, by astronomer calculations. Astronomers aren’t sure
how, or under what conditions, Dox came to have this composition.
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