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Chromospherically active stars. I. HD 136905.

Fekel, F. C.; Africano, J. L.; Quigley, R. +3 more

The variable star HD 136905, recently designated GX Librae, is a chromospherically active K1 III single-lined spectroscopic binary with a period of 11.1345 days. It has moderate strength Ca II H and K and ultraviolet emission features, while Hα is strongly in absorption. The inclination of the systems is 58°±17° and the unseen secondary is most li…