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Joint Hα and X‐Ray Observations of Massive X‐Ray Binaries. III. The Be X‐Ray Binaries HDE 245770 = A0535+26 and X Persei
We present results from an H-alpha monitoring campaign of the Be X-ray binary systems HDE 245770 = A 0535+26 and X Per. We use the H-alpha equivalent widths together with adopted values of the Be star effective temperature, disk inclination, and disk outer boundary to determine the half-maximum emission radius …