Photometry and spectroscopy of LS V+44 17
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https://b2find.eudat.eu/dataset/d72267ae-1344-5df2-b575-4736356959e2
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We present the spectroscopic and photometric observations on the Be/X-ray binary RX J0440.9+4431 from 2001 to 2014. The short-term and long-term variability of the H{alpha} line...
