Optical and near infrared observations of accretion processes in galactic compact objects

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dc.contributor.advisor Callanan, Paul en
dc.contributor.author McConnell, Owen
dc.date.accessioned 2017-10-04T11:26:52Z
dc.date.available 2017-10-04T11:26:52Z
dc.date.issued 2017
dc.date.submitted 2017
dc.identifier.citation McConnell, O. 2017. Optical and near infrared observations of accretion processes in galactic compact objects. PhD Thesis, University College Cork. en
dc.identifier.endpage 130 en
dc.identifier.uri http://hdl.handle.net/10468/4828
dc.description.abstract In this thesis, we present optical and near-infrared observations of compact binary systems. The observations are used to refine the binary parameters of several Low Mass X-ray Binaries, and to better understand the accretion processes in these systems. Accretion is essential in the formation of stars, planets and solar systems yet remains poorly understood. In this thesis, we present results that focus on the accretion processes in two important Low Mass X-ray Binary systems. In Chapter 3, optical photometry and spectroscopy are used to study the pulsar system PSR J102341.6+003841. The system has been observed to be accreting material from its companion, while radio pulsations indicate this accretion process is transient in nature. Combining quiescent photometry and spectroscopy allows us to constrain the binary orbital parameters, while photometry obtained when the system was in outburst allows us to investigate the nature of accretion within the system. In Chapter 4, simultaneous optical photometry and spectroscopy is used to present a proof of concept for the black hole system A0620-00. We used spectroscopy to determine the contribution of the light from the accretion disc at each phase of our observation. This contribution was then removed from the optical light curve, leaving the pure ellipsoidal modulation due to the motion of the secondary ii star. Our results suggest that for systems such as A0620, we will require the next generation of telescopes to successfully complete such a study. Finally, Chapter 5, focuses on the black hole system GRS1915+105, one of the most massive stellar mass black holes in the Galaxy. We present infrared spectroscopy in an attempt to constrain the mass of the black hole and determine any orbital period variation. The presence of double peaked emission lines in the spectra allow us to probe the nature of the very large accretion disc in this long period system. en
dc.description.sponsorship Science Foundation Ireland (Grant 4230 R14207) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2017, Owen McConnell. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Astronomy en
dc.title Optical and near infrared observations of accretion processes in galactic compact objects en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.check.info No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Science Foundation Ireland en
dc.description.status Not peer reviewed en
dc.internal.school Physics en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
ucc.workflow.supervisor paulc@miranda.ucc.ie
dc.internal.conferring Autumn 2017 en

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