NDLI: Two Neutron Star SXT in Quiescence : 4 U 2129 + 47 and EXO 0748-676

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Two Neutron Star SXT in Quiescence : 4 U 2129 + 47 and EXO 0748-676

Content Provider	Semantic Scholar
Author	Garcia, M. Rodriguez Callanan, Paul J.
Copyright Year	2008
Abstract	We report on x-ray observations of two soft x-ray transients containing neutron stars, 4U 2129+47 and EXO 0748-676. Our emphasis is on the quiescent properties of these sources. The x-ray spectrum and lightcurve of the eclipsing Low-Mass X-ray Binary (LMXB) 4U 2129+47 was measured with the ROSAT PSPC during its current quiescent state. The quiescent x-ray luminosity of ∼ 10 erg s and blackbody temperature of kT ∼ 0.21 keV are similar to other quiescent LMXB. The quiescent x-ray light curve appears to show orbital modulation, but the statistics are insufficient to distinguish between a v-shaped partial eclipse (as seen in the high state) or a total, square wave eclipse. The similarity in the luminosity and temperature to other (non-eclipsing) quiescent LMXB implies that the vertical structure in the disk which blocked our direct view of the neutron star in the high state has collapsed, and the neutron star is seen directly. EXO 0748-676 was serendipitously observed with the Einstein IPC in quiescence before it was discovered as a bright transient with EXOSAT. Our re-analysis of this quiescent observation finds Lx ∼ 10 34.0 erg s, and blackbody temperature of kT ∼ 0.22 keV, again similar to other LMXBs in quiescence. Subject headings: binaries:close — stars:individual (4U 2129+47 = V1727 Cygni, EXO 0748-676) — stars:neutron — X-rays: stars
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://arxiv.org/pdf/astro-ph/9904117v1.pdf
Language	English
Access Restriction	Open
Subject Keyword	Diagnostic radiologic examination Eclipse GUCY2C protein, human Kiloelectronvolt Medical Subject Headings Modulation Molecular orbital Neutrons Quiesce Quiescence search Rajiformes Roentgen Rays Stars, Celestial
Content Type	Text
Resource Type	Article

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