The Milky Way…..The Solar Neighborhood. XLII. Parallax Results from the CTIOPI 0.9 m Program—Identifying New Nearby Subdwarfs Using Tangential Velocities and Locations on the H–R Diagram. The Astronomical Journal, 2017; 154 (5): 191 DOI: 10.3847/1538-3881/aa8b64
Astronomers have discovered some of the oldest stars in our Milky Way galaxy by determining their locations and velocities, according to a study led by scientists at Georgia State University. Just like humans, stars have a life span: birth, youth, adulthood, senior and death. This study focused on old or “senior citizen” stars, also known as cool subdwarfs, that are much older and cooler in temperature than the sun.
The Milky Way is nearly 14 billion years old, and its oldest stars developed in the early stage of the galaxy’s f...
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