Posted on by Paul M. Sutter

This Star Killed its Companion and is now Escaping the Milky Way

Tauris argues that a lopsided supernova explosion may be the source of certain hypervelocity stars (image credit: IsiacDaGraca).

Our universe is capable of some truly frightening scenarios, and in this case we have an apparent tragedy: two stars, lifelong companions, decide to move away from the Milky Way galaxy together. But after millions of years of adventure into intergalactic space, one star murders and consumes the other. It now continues its journey through the universe alone, much brighter than before, surrounded by a shell of leftover remnants.

At least, we think. All we have to go on right now is a crime scene.

Let’s investigate.

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Posted on by Matt Williams

Binary Stars Orbiting Each Other INSIDE a Planetary Nebula

The planetary Nebula M3-1, obtained by Hubble Space Telescope. The central star is actually a binary system with one of the shortest orbital periods known. Credit: David Jones/Daniel López/IAC

Planetary nebulae are a fascinating astronomical phenomena, even if the name is a bit misleading. Rather than being associated with planets, these glowing shells of gas and dust are formed when stars enter the final phases of their lifespan and throw off their outer layers. In many cases, this process and the subsequent structure of the nebula is the result of the star interacting with a nearby companion star.

Recently, while examining the planetary nebula M3-1, an international team of astronomers noted something rather interesting. After observing the nebula’s central star, which is actually a binary system, they noticed that the pair had an incredibly short orbital period – i.e. the stars orbit each other once every 3 hours and 5 minutes. Based on this behavior, the pair are likely to merge and trigger a nova explosion.

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Posted on by Matt Williams

Telescope Pierces into One of the Biggest Nebulae in the Milky Way to Reveal its Newly Forming (and Nearly Dying) Stars

Image of the Carina nebula taken by VISTA, which reveals the dynamic cloud of interstellar matter and thinly spread gas and dust as never before. Credit: ESO/J. Emerson/M. Irwin/J. Lewis

Located about 7500 light-years from Earth, in the constellation of Carina, lies a star-forming region known as the Carina Nebula. This dynamic, evolving cloud of interstellar gas and dust measures about 300 light-years in diameter and is one of the Milky Way’s largest star-forming regions. It is also an exercise in contrasts, consisting of bright regions of gas illuminated by intense stellar radiation and dark pillars of dust that obscure star formation.
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