emamajek on 01-Oct-2017 06:42:07 GMT about HD 131976
Unresolved pair GJ 570 BC is considered spectral standard of type M1.5V by Keenan (1989ApJS...71..245K), but Duquennoy & Mayor (1988A%26A...200..135D) split the spectroscopic binary and find component spectral types:
GJ 570 B: M1V
GJ 570 C: M3Ve?
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View annotation on HD 131976 object