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V725 Tau during outburst


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About this observation
Tony Rodda
Time of observation
23/11/2016 - 20:30
V725 Tau (X-ray binary)
Observing location
Newcastle (TRO)
C925 (0.63) with CGEM
ALPY600 with calibration module
Atik460EX mono

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.  

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