Optical Spectroscopic observations of the Be/X-Ray binary A0535+262/V725 Tau during the giant outburst in 2009

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Optical high dispersion spectroscopic observations of the Be/X-ray binary A0535+262/V725 Tau during the giant outburst will be reported. The giant outburst occurred in A0535+262 in November 2009 for the first time since 2005. We carried out the spectroscopic monitoring from November 2009. In the brightening phase of the giant outburst, the observation performed densely (almost at every night). Obtained H-alpha, H-beta and He I emission line, exhibiting dramatical profile variability during the giant outburst, has highly redshifted ( 100km/s) bright component, which had weakened before the normal outburst in March 2010. We discuss profile variability of these emission lines.

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