How Do Z and Atoll X-Ray Binaries Differ?. Muno, M. P., Remillard, R. A., & Chakrabarty, D. The Astrophysical Journal, 568(1):L35, March, 2002. ![How Do Z and Atoll X-Ray Binaries Differ? [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Low-mass X-ray binaries containing weakly magnetized neutron stars may be divided into two classes, Z and atoll sources, based upon correlations between their X-ray timing properties and the patterns that they trace in plots of two X-ray colors. In this Letter we examine color-color diagrams of eight atoll sources and four Z sources using data from the Rossi X-Ray Timing Explorer. The 5 year span of data we have examined is significantly longer than the spans of previous studies. We find that the previous clear distinction between color-color diagrams from atoll and Z sources is an artifact of incomplete sampling, as those atoll sources that are sampled over a wide dynamic range in intensity (F\textlessSUB\textgreatermax\textless/SUB\textgreater/F\textlessSUB\textgreatermin\textless/SUB\textgreater>~80) trace three-branched color-color patterns similar to the tracks for which Z sources are named. However, atoll sources trace this pattern over a larger range of luminosity and on much longer timescales than do Z sources and exhibit much harder spectra when they are faint, which argues against any simple unification scheme for the two classes of source. \textlessP /\textgreater
@article{munoHowAtollXRay2002,
title = {How {Do} {Z} and {Atoll} {X}-{Ray} {Binaries} {Differ}?},
volume = {568},
issn = {0004-637X},
url = {https://ui.adsabs.harvard.edu/abs/2002ApJ...568L..35M/abstract},
doi = {10.1086/340269},
abstract = {Low-mass X-ray binaries containing weakly magnetized neutron stars may be divided into two classes, Z and atoll sources, based upon correlations between their X-ray timing properties and the patterns that they trace in plots of two X-ray colors. In this Letter we examine color-color diagrams of eight atoll sources and four Z sources using data from the Rossi X-Ray Timing Explorer. The 5 year span of data we have examined is significantly longer than the spans of previous studies. We find that the previous clear distinction between color-color diagrams from atoll and Z sources is an artifact of incomplete sampling, as those atoll sources that are sampled over a wide dynamic range in intensity (F{\textless}SUB{\textgreater}max{\textless}/SUB{\textgreater}/F{\textless}SUB{\textgreater}min{\textless}/SUB{\textgreater}\>{\textasciitilde}80) trace three-branched color-color patterns similar to the tracks for which Z sources are named. However, atoll sources trace this pattern over a larger range of luminosity and on much longer timescales than do Z sources and exhibit much harder spectra when they are faint, which argues against any simple unification scheme for the two classes of source. {\textless}P /{\textgreater}},
language = {en},
number = {1},
urldate = {2019-11-11},
journal = {The Astrophysical Journal},
author = {Muno, Michael P. and Remillard, Ronald A. and Chakrabarty, Deepto},
month = mar,
year = {2002},
pages = {L35},
}
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