Joint Hα and X-ray observations of massive X-ray binaries.: I.: The B supergiant system LS I+65010 = 2S 0114+650

We report on a 3 yr spectroscopic monitoring program of the H alpha emission in the massive X-ray binary LSI + 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 days and confirm that the orbit has a nonzero eccentricity e = 0.18 +/- 0.05. The H alpha emission profile is formed in the base of the wind of the B supergiant primary, and we show how this spectral feature varies on timescales that are probably related to the rotational period of the B supergiant. We also examine the X-ray fluxes from the Rossi X-ray Timing Explorer All-Sky Monitor instrument, and we show that the X-ray orbital light curve has a maximum at periastron and a minimum at the inferior conjunction of the B supergiant. We also show that the wind emission strength and the high-energy X-ray flux appear to vary in tandem on timescales of approximately 1 yr.