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Permanent link (DOI): https://doi.org/10.7939/R3V11VT9S

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Constraints On The Very Faint X-Ray Transient System M15 X-3 Open Access

Descriptions

Other title
Subject/Keyword
Neutron Stars
Compact Objects
X-Ray Binaries
Accretion
X-Ray Astronomy
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Arnason, Robin M
Supervisor and department
Sivakoff, Gregory (Physics)
Examining committee member and department
Morsink, Sharon (Physics)
Sivakoff, Gregory (Physics)
Grant, Darren (Physics)
Heinke, Craig (Physics)
Department
Department of Physics
Specialization

Date accepted
2014-08-29T09:39:40Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
We present the first combined optical/X-ray observation of a very faint transient X-ray binary (VFXT), M15 X-3. Chandra observations constrain the source to be < 10^34 erg/s in all observations. The X-ray spectrum shows evidence of curvature, and is best fit by a broken power law with break energy E_break = 2.71+0.38 -0:05 keV, and power law indices of Gamma_1 = 1.25+0.02 -0.01 and Gamma_2 = 1.82+0.20 -0.02. Fitting the HST magnitudes of the optical counterpart suggests a power-law accretion disk and a main-sequence companion of size 0.440+0.035 -0:060 solar masses. This mass estimate is likely to be an upper limit since the short inferred period of P ~ 4 hr implies the companion is irradiated. This rules out several explanations for very faint transient behaviour for this source, and suggests a neutron star accretor experiencing inefficient accretion due to a propeller effect.
Language
English
DOI
doi:10.7939/R3V11VT9S
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: Constraints on the Very Faint X-Ray Transient System M15 X-3
File author: Robin Arnason
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