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Photometric Studies of EV Cnc and AH Cnc in the Open Cluster M67

Research in Astronomy and Astrophysics 2024年第8期24卷 196-211页

作者： Mamatha Rani G. k.sriram.deblina lahiri Vijaya,A. Department of Astronomy Osmania UniversityHyderabad 500007India

Contact binaries at various stages of evolution unveil various operating mechanisms that drive *** report the photometric and period variation analysis of two contact binaries EV Cnc and AH Cnc in open cluster *** observed the cluster from the JCBT 1.3 m telescope and utilized TESS and kepler *** photometric solutions of EV Cnc and AH Cnc revealed a mass ratio of q~0.41 and~0.15 with an inclination of i=42°and87°*** solutions suggest that EV Cnc is probably a semi-detached and AH Cnc is a deep low-mass ratio contact *** study of O-C variation analysis indicates that for both systems,the period is increasing which suggests the mass transfer is occurring from secondary to *** the case of AH Cnc and based on simulations by randomly varying the time of minima to fit the LITE solution,we noted the third body orbital period to be around P_(3)=26.82±2.54 yr,which is different from earlier reported values and conclude that future observations are required to confirm this *** compare these two systems with other similar contact binaries to get an estimate of the final configuration of the respective systems.

关键词： (stars)binaries(including multiple) close-(stars)binaries eclipsing-stars activity

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Probing the Variation of Reverberation Lags along with X-Ray Flux in the AGN Mrk 704

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Research in Astronomy and Astrophysics 2023年第3期23卷 75-84页

作者： k.sriram.deblina lahiri Vivek k.Agrawal D.Nour C.S.Choi Department of Astronomy Osmania UniversityHyderabad 500007India korea Astronomy and Space Science Institute Daejeon 34055Republic of Korea Space Astronomy Group ISITE CampusU.R.Rao Satellite CentreOuter Ring Road.MarathahallBangalore 560037India Department of Physics Faculty of ScienceAl Baath UniversityHomsSyria

Understanding the variation of lags with respect to the X-ray flux is important to explore the geometry of the inner region of the accretion disk in *** performed frequency-lag,energy–lag and spectral studies for two sets of observations,in order to investigate the variations in lags with respect to X-ray flux in the AGN source Mrk 704 using the XMM-Newton *** divided one of the light curves into two sections which were noticed to exhibit a flux *** frequency-lag spectra in different energy domains revealed that reverberation(soft)lags varied along with the *** the first time,we show that the blurred reflection model can consistently explain the soft excess observed in the X-ray spectra for this *** fluxes of soft(i.e.,reflection)and hard components were noted to vary by~18%and~9%respectively,across the *** soft lag amplitude was found to be larger at the high flux state than the amplitude at the low flux *** importantly,we found that both frequency-lag and energy–lag spectra do not display significant variation between two observational data sets despite a flux variation of 43%.This phenomenon cannot be explained by the reflection model because the soft lag amplitudes must be larger in the high flux *** probable scenario is that,in the low flux state,the obscuring cloud delays the reflected soft photons which increases the soft lag amplitude.

关键词： reflected curing AGN

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