Linear equations for deriving BC from (J − K) using the location of the star in the two-colour plane.
|Group||(J − K)||(K − L′)||BC relation|
|A||1–1.6||0–0.5||BCK = 1.40 (J − K) + 1.22 [± 0.13]|
|B||1.1–1.95||0.5–1.0||BCK = 0.84 (J − K) + 1.73 [± 0.12]|
|C||1.75–2.9||1.0–1.6||BCK = +2.94 [± 0.07]|
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