Zeta Ophiuchi — Runaway Star


This new image from NASA is simply jaw-droppingly stunning … words fail me …

If you click on the picture, you will get a larger copy to look at.

OK, so what exactly do we have here? Well, the blue star near the center of this image is Zeta Ophiuchi. Now if you took out an ordinary telescope, then when seen in visible light, all you would see is dim red star surrounded by other dim stars and no dust. However, NASA have captured an infrared image and so we can now see not only a heck of a lot more detail, but also am amazingly beautiful image

When viewed with NASA’s Wide-field Infrared Survey Explorer, or WISE, this completely different view emerges. Zeta Ophiuchi is revealed to be a very massive super-giant, hot, bright blue star plowing its way through a large cloud of interstellar dust and gas.

As explained by NASA …

Astronomers theorize that this stellar juggernaut was likely once part of a binary star system with an even more massive partner. It’s believed that when the partner exploded as a supernova, blasting away most of its mass, Zeta Ophiuchi was suddenly freed from its partner’s pull and shot away like a bullet moving 24 kilometers per second (54,000 miles per hour). Zeta Ophiuchi is about 20 times more massive and 65,000 times more luminous than the sun [Wow]. If it weren’t surrounded by so much dust, it would be one of the brightest stars in the sky and appear blue to the eye. Like all stars with this kind of extreme mass and power, it subscribes to the ‘live fast, die young’ motto. It’s already about halfway through its very short 8-million-year lifespan. In comparison, the sun is roughly halfway through its 10-billion-year lifespan. While the sun will eventually become a quiet white dwarf, Zeta Ophiuchi, like its ex-partner, will ultimately die in a massive explosion called a supernova.

Perhaps the most interesting features in this image are related to the interstellar gas and dust that surrounds Zeta Ophiuchi. Off to the sides of the image and in the background are relatively calm clouds of dust, appearing green and wispy, slightly reminiscent of the northern lights. Near Zeta Ophiuchi, these clouds look quite different. The cloud in all directions around the star is brighter and redder, because the extreme amounts of ultraviolet radiation emitted by the star are heating the cloud, causing it to glow more brightly in the infrared than usual.

Even more striking, however, is the bright yellow curved feature directly above Zeta Ophiuchi. This is a magnificent example of a bow shock. In this image, the runaway star is flying from the lower right towards the upper left. As it does so, its very powerful stellar wind is pushing the gas and dust out of its way (the stellar wind extends far beyond the visible portion of the star, creating an invisible ‘bubble’ all around it). And directly in front of the star’s path the wind is compressing the gas together so much that it is glowing extremely brightly (in the infrared), creating a bow shock. It is akin to the effect you might see when a boat pushes a wave in front it as it moves through the water. This feature is completely hidden in visible light. Infrared images like this one from WISE shed an entirely new light on the region.

The image has been sourced directly from NASA here.

I also offer a hit tip to Phil Plate who also blogged about this here, and has lots of more information on this that you might be interested in checking out.

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