Hubble captures image of two of Milky Ways most colossal stars

November 26th, 2008 - 2:51 pm ICT by ANI  

Berlin, Nov 26 (ANI): The Hubble Space Telescope has captured the image of a pair of stars that are two of our galaxys most massive stars.

They have, until recently, been shrouded in mystery, but the new image shows them in greater detail than ever before.

The image shows a pair of colossal stars, WR 25 and Tr16-244, located within the open cluster Trumpler 16. This cluster is embedded within the Carina Nebula, an immense cauldron of gas and dust that lies approximately 7500 light-years from Earth.

The Carina Nebula contains several ultra-hot stars, including these two star systems and the famous blue star Eta Carinae, which has the highest luminosity yet confirmed.

As well as producing incredible amounts of heat, these stars are also very bright, emitting most of their radiation in the ultraviolet and appearing blue in colour.

They are so powerful that they burn through their hydrogen fuel source faster than other types of stars, leading to a live fast, die young lifestyle.

While WR 25 is the brightest, the neighbouring Tr16-244 is the third brightest, just to the upper left of WR 25. The second brightest, to the left of WR 25, is a low mass star located much closer to the Earth than the Carina Nebula.

Stars like WR 25 and Tr16-244 are relatively rare compared to other, cooler types.

They interest astronomers because they are associated with star-forming nebulae, and influence the structure and evolution of galaxies.

WR 25 is likely to be the most massive and interesting of the two.

Its true nature was revealed two years ago when an international group of astronomers led by Roberto Gamen, then at the Universidad de La Serena in Chile, discovered that it is composed of at least two stars.

The more massive is a Wolf-Rayet star and may weigh more than 50 times the mass of our Sun.

It is losing mass rapidly through powerful stellar winds that have expelled the majority of its outermost hydrogen-rich layers, while its more mundane binary companion is probably about half as massive as the Wolf-Rayet star, and orbits around it once every 208 days.

Massive stars are usually formed in compact clusters.

Often, the individual stars are so physically close to each other that it is very difficult to resolve them in telescopes as separate objects.

These Hubble observations have revealed that the Tr16-244 system is actually a triple star. Two of the stars are so close to each other that they look like a single object, but Hubbles Advanced Camera for Surveys shows them as two. (ANI)

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