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The Evolutionary Status of GK Subgiants
DOI: 10.3847/1538-3881/ab11c6
Bibcode: 2019AJ....157..177A
Abt, Helmut A.
Snowden & Young suggested that the reason why there are GK subgiants is because they are members of binaries, which would bring them above the main sequence in an Hertzsprung-Russell (HR) diagram. They studied a sample of 30 G0-K1 IV stars and were disappointed to find only two to be spectroscopic binaries. With more accurate radial velocities…
2019
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The Astronomical Journal
Hipparcos
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