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August 25, 2017

Astronomers capture best image yet of a star other than the sun

by John_A

See that photo above? It might look a lot hazier than the HD photos you’re used to, but it’s the best and most detail image of a star other than our own sun that we’ve captured thus far. A team of astronomers led by Keiichi Ohnaka have used ESO’s Very Large Telescope Interferometer in Chile to map Antares, one of the largest known stars and the brightest in the Scorpius constellation. Antares, a red supergiant, is visible to the naked eye as a reddish, twinkling star, but we’ve never seen it this close before.

ESO’s VLTI is a collection of four 8.2-meter telescopes and four smaller, 1.8-meter auxiliary telescopes. Together, the eight instruments form a massive virtual telescope 200 meter across. This capability allows the VLTI to spot the finer details the telescopes won’t be able to see on their own.

Ohnaka says they chose Antares, because aside from the fact that its size makes it easier to observe than its smaller counterparts, it’s still a mystery how big stars like it “lose mass so quickly in the final phase of their evolution.” Mapping its surface and the movements of the gases in its atmosphere is “a crucial step towards clarifying this problem.” It’s also nice to have a close-up photo of Antares before it explodes in the next few hundred thousand years.

The red regions in the team’s velocity map below represent gases moving away from us, while the blue sections are the gases approaching us:

Ohnaka says the technique can be “applied to different types of stars to study their surfaces and atmospheres in unprecedented detail.” He added: “This has been limited to just the sun up to now. Our work brings stellar astrophysics to a new dimension and opens an entirely new window to observe stars.”

Source: ESO

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