Possible evidence for the existence of an HII region around the neutron star in LSI+65 degrees 010

Our spectroscopic observation of the Be/X-ray binary LSI+65 degrees 010 sho wed a dramatic variation in November 1992 with an increase by a factor of m ore than 3 in the equivalent width of the Her emission line. This supports the view that the primary is a Be star father than a supergiant. A well-def ined double-peaked profile in seen in the spectrum of September 1994: while the red peak remained at 6563 Angstrom, the blue one was -7.2 Angstrom to the blue. We suggest that such a profile is caused by the superposition of two emission lines, one from the shell of the Be star, one from an HII regi on around the neutron star. This provides, for the first time, direct obser vational evidence for the existence of a HII region around compact object a nd caused by X-ray emission. On 1992-11-04, the red side of the H-alpha lin e did not change while the blue side was greatly enhanced. We suggest that this may be caused by the HII region around the neutron star.