Some of you may have seen the recent notices recently from TA, BAA, AAVSO, et al regarding the Be star in the high mass X-ray transient AO535+26/HDE245770.
I took this on 23/11/2016, roughly midway between Periastron (16th) and the final coverage date requested (2/12/2016). That is, at the onset of the X-ray outburst following the optical brightening expected at Periastron passage.
Nothing like the usual O type star spectrum (either using a nearby Miles star or a Pickles O9V as instrument responses).
The flux calibration can’t be taken seriously as the star brightens from it’s usual 9.39 V mag in that regime at this point.