Ackermann red stars
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https://b2find.eudat.eu/dataset/8f0d7e44-2fa0-5bdd-9a1a-dcaf9e53ee3b
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In the late 1960s Gerhard Ackermann published two lists of extremely red stars (1968ZA.....69..130A and 1970A&A.....8..315A), including what appeared to be reliable spectral...
