Surprise! Orion Nebula cluster had 3 ages of star formation


The Orion Nebula is one of the most heavily studied astronomical targets in the night sky, but that doesn’t mean it has stopped surprising astronomers. In fact, new work suggests that its many young stars formed in three distinct waves, over just a few million years.

As the active star-forming region that’s nearest to Earth, located around 1,350 light-years away in the constellation of Orion, the nebula is known to contain a bevy of young stars that occupy the Orion Nebula cluster. Now, astronomers using the OmegaCAM instrument on the VLT Survey Telescope (VST), located at the European Southern Observatory’s (ESO) Paranal Observatory in Chile, have revealed previously unknown detail in this population of stars.

By precisely measuring the brightness and color of all the stars in the cluster, the researchers determined the ages and masses of the stars. The study, accepted for publication in the journal Astronomy & Astrophysics, describes a surprise discovery that there are in fact three different populations of young stars. [The Splendor of the Orion Nebula (Photos)]

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This means that star-formation processes driven by the Orion Nebula happened over three distinct phases, rather than at the same time as was previously thought, the researchers said. And it all likely happened in just a few million years.

This finding could transform our understanding of the age distribution of other star clusters, the study’s researchers said in a statement, and it adds new detail to the story of star-formation processes.

“Looking at the data for the first time was one of those ‘Wow!’ moments that happen only once or twice in an astronomer’s lifetime,” Giacomo Beccari, an ESO astronomer and the lead author of the study, said in a statement. “The incredible quality of the OmegaCAM images revealed without…

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