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We study the variations in the Cyclotron Resonant Scattering Feature (CRSF)during 2011 outburst of the high mass X-ray binary 4U 0115+63 usingobservations performed with Suzaku, RXTE, Swift and INTEGRAL satellites. Thewide-band spectral data with low energy coverage allowed us to characterize thebroadband continuum and detect the CRSFs. We find that the broadband continuumis adequately described by a combination of a low temperature (kT ~ 0.8 keV)blackbody and a power-law with high energy cutoff (Ecut ~ 5.4 keV) without theneed for a broad Gaussian at ~ 10 keV as used in some earlier studies. Thoughwinds from the companion can affect the emission from the neutron star at lowenergies (< 3 keV), the blackbody component shows a significant presence in ourcontinuum model. We report evidence for the possible presence of twoindependent sets of CRSFs with fundamentals at ~ 11 keV and ~ 15 keV. These twosets of CRSFs could arise from spatially distinct emitting regions. We alsofind evidence for variations in the line equivalent widths, with the 11 keVCRSF weakening and the 15 keV line strengthening with decreasing luminosity.Finally, we propose that the reason for the earlier observed anti-correlationof line energy with luminosity could be due to modelling of these twoindependent line sets (~ 11 keV and ~ 15 keV) as a single CRSF.

Variations in the Cyclotron Resonant Scattering Features during 2011 outburst of 4U 0115+63