Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7660
Full metadata record
DC FieldValueLanguage
dc.contributor.authorDevasia, Jincy-
dc.contributor.authorGayathri, Raman-
dc.contributor.authorPaul, Biswajit-
dc.date.accessioned2021-02-03T08:58:59Z-
dc.date.available2021-02-03T08:58:59Z-
dc.date.issued2021-02-
dc.identifier.citationNew Astronomy, 2021, Vol. 83, 101479en_US
dc.identifier.issn1384-1076-
dc.identifier.urihttp://hdl.handle.net/2289/7660-
dc.descriptionRestriced Accessen_US
dc.description.abstractWe report the detection of 5 Type-1 thermonuclear X-ray bursts and one burst-like event in the neutron star LMXB source, Cyg X-2 using X-ray data obtained with the Large Area X-ray Proportional Counter (LAXPC) instrument on board AstroSat. We carry out an energy resolved burst profile analysis as well as time resolved spectral analysis for each of the bursts and characterize their properties. All bursts are weak with burst peak-to-persistent intensity ratios < 3, decay times ~ 1.2 s, and with fluences ~1×10−8 ergs/cm2, indicating that the observed bursts are Helium fuelled flashes. An evolution of the blackbody temperature and radius is also observed during each burst. We carry out a search for Burst Oscillations (BO) and derive upper limits to the rms fractional amplitude for BO (for all the bursts) to be ~ 1%. We also carried out search for Quasi Periodic Oscillations (QPOs) in the power density spectra and we obtain upper limits to the fractional rms amplitude as ~ 3.4% at frequencies close to ~ 5.6 Hz. We further carry out spectral and timing analysis of the non-burst persistent emission along with a study of the hardness-intensity and colour-colour diagrams. Using results from our analysis we infer that during this observation in 2016, Cyg X-2 can be characterized as being in the early Flaring Branch (FB) with a puffed up accretion disk and a clumpy coronal structure while undergoing medium-to-high levels of accretion.en_US
dc.language.isoenen_US
dc.publisherElsevier B. Ven_US
dc.relation.urihttps://arxiv.org/pdf/2008.07172.pdfen_US
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S1384107620300877en_US
dc.relation.urihttps://inspirehep.net/literature/1811989en_US
dc.rights2021 Elesvier B.V.en_US
dc.subjectX-Raysen_US
dc.subjectBinariesen_US
dc.subject(Stars:) starsen_US
dc.subjectNeutronen_US
dc.subjectAccretionen_US
dc.subjectAccretion discsen_US
dc.titleThermonuclear X-ray bursts detected in Cyg X-2 using AstroSat/LAXPCen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
2021_New Astronomy_Vol.22_Article No.101479.pdf
  Restricted Access
Restriced Access3.82 MBAdobe PDFView/Open Request a copy


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.