Different stages of star formation can be measured in different ways, a number of which involve so-called emission lines – narrow regions within the electromagnetic spectrum where an object emits much ...

We found [Fe/H] values of -0.86 ± 0.12 and -1.08 ± 0.13 for Mercer 5 and 2MASS GC02, respectively. The [O/Fe], [Si/Fe], and [Ti/Fe] ratios of the measured stars of Mercer 5 follow the general trend of ...

By knowing the ages of a large population of stars, we can study how our galaxy formed and evolved over time. How do astronomers measure the rotation rate of a distant star? They look for changes ...