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Hubble telescope has found strange star nicknamed Nasty 1

May 23, 2015 By Kyle Mills 2 Comments

nastyAstronomers have found a large, fast aging star that has never been seen in the Milky Way galaxy. They have found this star using Hubble Space Telescope.

Since the star is so different, astronomers have named it Nasty 1, a play on its catalog name of NaSt 1, it is located 3,000 light years from Earth.

Astronomers believe that the strange star may represent a brief transitory stage in evolution of extremely massive stars.

The star was first discovered decades ago, and identified as Wolf Rayet star, a rapidly evolving star that is more massive than the sun. The star losses its hydrogen out layers quickly and exposing its super hot and bright helium burning core.

But Nasty 1 doesn’t look like a typical Wolf Rayet star.

Jon Mauerhan of the University of California, Berkeley, and study leader said, “We were excited to see this disk-like structure because it may be evidence for a Wolf-Rayet star forming from a binary interaction, there are very few examples in the galaxy of this process in action because this phase is short-lived, perhaps lasting only a hundred thousand years, while the timescale over which a resulting disk is visible could be only ten thousand years or less.”

The star evolves quickly but as is begins to run out of hydrogen, it swells. Researchers believe that this can happen much faster compared to the life of other stars and Nasty 1 is believed to be only few thousand years.

Nathan Smith of the University of Arizona in Tucson, and co-author of the study said, “We’re finding that it is hard to form all the Wolf-Rayet stars we observe by the traditional wind mechanism, because mass loss isn’t as strong as we used to think, mass exchange in binary systems seems to be vital to account for Wolf-Rayet stars and the supernovae they make, and catching binary stars in this short-lived phase will help us understand this process.”

It was not an easy task to observe Nasty 1. The star is heavily covered by gas and dust and it even blocked the view of Hubble telescope.

Mauerhan said, “What evolutionary path the star will take is uncertain, but it will definitely not be boring, Nasty 1 could evolve into another Eta Carinae-type system. To make that transformation, the mass-gaining companion star could experience a giant eruption because of some instability related to the acquiring of matter from the newly formed Wolf-Rayet. Or, the Wolf-Rayet could explode as a supernova. A stellar merger is another potential outcome, depending on the orbital evolution of the system. The future could be full of all kinds of exotic possibilities depending on whether it blows up or how long the mass transfer occurs, and how long it lives after the mass transfer ceases.

Filed Under: Discovery Tagged With: Hubble observes strange star nicknamed nasty, Jon Mauerhan, Milky Way galaxy, NaSt 1, Nasty 1, Nathan Smith, transitory stage, Wolf Rayet star

11 galaxies identified flinging far away from their homes

April 26, 2015 By Carrie Davis Leave a Comment

Orion-nebula

The scientists have discovered 11 different runaway galaxies that had been flung far away from their original homes, allowing to wander into deep space.

The latest discovery has thrown light on a substantial amount of knowledge about such strange features.

The astronomers explain an object is known as a “runaway” when it is able to travel faster than escape velocity. This makes it leave the home and never return back. According to the scientists, runaway stars perfectly fit to this description when they speed more than one million miles per hour. A runaway galaxy should move even faster, i.e. at approximately six million miles per hour.

When the researchers began their exploration, they initially sought to discover new members that belong to a class of galaxies called the compact ellipticals. According to the researchers, these tiny star blobs are larger than the clusters of star. However, they are smaller than typical galaxies. If compared, our Milky Way galaxy is 100,000 light-years across.

Totally, the astronomers have spotted nearly 200 new compact galaxies. Approximately 11 of these galaxies had been completely isolated did not seem to be lying near any large galaxy or any particular cluster of galaxy. The million dollar question here arises is what force led to the creation of these galaxies.

According to the scientists, they have likely developed from a classic three-body interaction. A compact elliptical is expected to have been paired along with a large galaxy which has likely robbed it of all its stars. Then the impact of a third galaxy could interrupt this pair, causing it to fling in a compact elliptical direction. The larger galaxy could then absorb the complete third galaxy.

The findings of the study were published in the journal Science.

Filed Under: Discovery Tagged With: compact ellipticals, compact galaxies, Galaxy, Milky Way galaxy, runaway galaxy

Supernova explosion produces cosmic dust

March 20, 2015 By Dave Smith

supernovaCosmic dust in the center of our Milky Way galaxy resulted from supernova have finally been observed using the infrared telescope.

“Dust itself is very important because it’s the stuff that forms stars and planets, like the sun and Earth, respectively, so to know where it comes from is an important question” said Ryan Lau of Cornell University, lead author of the study.

There was so evidence that supernova produces the cosmic dust.

What is supernova? A supernova is an explosion of a massive supergiant star.

When the astronomers were examining the Milky Way they observed the ancient intersteller dust cloud known as Supernova Remnant Sagittarius A East.

“There have been no direct observations of any dust surviving the environment of the supernova remnant … until now, and that’s why our observations of an ‘old’ supernova are so important,” said Lau.

The astronomers have found details about the supernova remnant near the center of Milky Way galaxy by using an instrument called FORCAST (the Faint Object Infrared Camera Telescope) on board SOFIA (the Stratospheric Observatory for Infrared Astronomy), which is a joint project between German Aerospace Center, NASA and the Universities Space Research Association.

Previously it was thought that when the star dies after running out of fuel it explodes and no remnants are left. But it turns out that supernova which contains mineral enriched material like silicon, carbon and iron produces star dust as they explode. And this dust again forms the next generation of stars and planets.

Filed Under: Discovery Tagged With: cosmic dust, FORCAST, german aerospace center, Milky Way galaxy, NASA, space dust, supernova, Supernova Remnant Sagittarius A East, Universities Space Research Association

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