On the structure of quasi-Keplerian accretion discs surrounding millisecond X-ray pulsars

Simple item page
dc.contributor.authorIsaac, Habumugisha
dc.contributor.authorSolomon, B. Tessema
dc.contributor.authorEdward, Jurua
dc.contributor.authorSimon, K. Anguma
dc.date.accessioned2020-11-17T16:39:15Z
dc.date.available2020-11-17T16:39:15Z
dc.date.issued2020
dc.description.abstractIn this study, we investigated the time-independent dynamics (disc structure, forces and torques) of a quasi-Keplerian disc around a millisecond pulsar (MSP) with an internal dynamo. We considered the disc around a MSP to be divided into the inner, middle and outer regions. By assuming that the disc matter flows in a quasi-Keplerian motion, we derived analytical equations for a complete structure (temperature, pressure, surface density, optical depth and magnetic field) of a quasi-Keplerian thin accretion disc, and the pressure gradient force (PGF). In our model, the MSP-disc interaction results into magnetic and material torques, such that for a given dynamo ( ) and quasi-Keplerian (n) parameter, we obtained enhanced spin-up and spin-down torques for a chosen star spin period. Results obtained reveal that PGF results into episodic torque reversals that contribute to spinning-up or spinning-down of a neutron star, mainly from the inner region. The possibility of a quasi-Keplerian disc is seen and these results can explain the observed spin variations in MSPs like SAX J1808.4-3658 and XTE J1814-338.en_US
dc.description.sponsorshipKabale Universityen_US
dc.identifier.urihttp://hdl.handle.net/20.500.12493/463
dc.language.isoen_USen_US
dc.publisherIndian Academy of Sciencesen_US
dc.subject97.80.Jp X-ray binaries—97.60.Gb pulsars—97.10.Gz accretion and accretion discsen_US
dc.titleOn the structure of quasi-Keplerian accretion discs surrounding millisecond X-ray pulsarsen_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
On the structure of quasi-Keplerian accretion discs surrounding.pdf
Size:
600.3 KB
Format:
Adobe Portable Document Format
Description:
Main Article
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Faculty of Science (FSC)