Optical and X-ray studies of Be/X-ray binary 1A 0535+262 during its 2020 giant outburst

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dc.contributor.author Chhotaray, Birendra
dc.contributor.author Jaisawal, Gaurava K.
dc.contributor.author Kumari, Neeraj
dc.contributor.author Naik, Sachindra
dc.contributor.author Kumar, Vipin
dc.contributor.author Jana, Arghajit
dc.coverage.spatial United States of America
dc.date.accessioned 2022-11-23T06:08:29Z
dc.date.available 2022-11-23T06:08:29Z
dc.date.issued 2022-11
dc.identifier.citation Chhotaray, Birendra; Jaisawal, Gaurava K.; Kumari, Neeraj; Naik, Sachindra; Kumar, Vipin and Jana, Arghajit, "Optical and X-ray studies of Be/X-ray binary 1A 0535+262 during its 2020 giant outburst", arXiv, Cornell University Library, DOI: arXiv:2211.09491, Nov. 2022. en_US
dc.identifier.uri https://arxiv.org/abs/2211.09491
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/8332
dc.description.abstract We report results obtained from the optical and X-ray studies of the Be/X-ray binary 1A 0535+262/HD 245770 during the 2020 October giant X-ray outburst, using the 1.2 m telescope at Mount Abu Infrared observatory and AstroSat, respectively. The peak flux of the outburst was recorded to be around 11 Crab in the 15-50 keV range, the highest ever observed from the pulsar. We performed optical observations in the 6000-7200 angstroms band before, during, and after the outburst to investigate the evolution of the circumstellar disc of the Be star between 2020 February and 2022 February. Our optical spectra exhibit prominent emission lines at 6563 angstroms (H I), 6678 angstroms (He I), and 7065 angstroms (He I). We found a significantly variable Halpha line in the spectra. The single-peaked line profile appeared asymmetric with broad red- & blue-wings in the data before and during the outburst. The post-outburst observations, however, resulted in a double-peaked profile with asymmetry in the blue-wing. Our observations before the outburst confirmed a larger Be disc that decreased in size as the outburst progressed. Furthermore, the observed variabilities in the Halpha line profile and parameters suggest the presence of a highly misaligned, precessing, and warped Be disc. AstroSat observation of the pulsar detected pulsations at around 103.55 s in the light curve up to 110 keV. We found strongly energy-dependent pulse profiles with increasing contribution of the pulsing component in hard X-rays. The broadband spectral fitting in the 0.7-90.0 keV range confirmed the presence of the known cyclotron resonance scattering feature at around 46.3 keV.
dc.description.statementofresponsibility by Birendra Chhotaray, Gaurava K. Jaisawal, Neeraj Kumari, Sachindra Naik, Vipin Kumar and Arghajit Jana
dc.language.iso en_US en_US
dc.publisher Cornell University Library en_US
dc.subject 2020 giant outburst en_US
dc.subject Halpha line en_US
dc.subject Cyclotron resonance en_US
dc.subject Circumstellar disc en_US
dc.subject Pulse profiles en_US
dc.title Optical and X-ray studies of Be/X-ray binary 1A 0535+262 during its 2020 giant outburst en_US
dc.type Pre-Print Archive en_US
dc.relation.journal arXiv


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