Lurking about 5,000 light-years from Earth is an open cluster of young, energetic stars, dubbed NGC 6231. Given their less-than-Sunny disposition, these OB-type stars can wreak a lot of havoc on their ...

In some ways, star clusters are like giant families with thousands of stellar siblings. These stars come from the same origins — a common cloud of gas and dust — and are bound to one another by ...

We have determined accurate MK types for 26 of the brightest stars in the field of NGC 6231. We found one emission-line star with a weak shell, one star with in strong (already known), four stars with ...

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