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Joint Hα and X‐Ray Observations of Massive X‐Ray Binaries. I. The B Supergiant System LS I +65 010 = 2S 0114+650
We report on a three year spectroscopic monitoring program of the H-alpha emission in the massive X-ray binary LS I +65 010 = 2S 0114+650, which consists of a B-supergiant and a slowly rotating X-ray pulsar. We present revised orbital elements that yield a period of P=11.5983 +/- 0.0006 d …