Are ``Z" and ``Atoll" Sources the Same?

Details Are ``Z" and ``Atoll" Sources the Same? Are ``Z" and ``Atoll" Sources the Same?

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.2703m&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #27.03; Bulletin of the American Astronomical Society, Vol. 33, p.1350

Astronomy and Astrophysics

Astronomy

Scientific paper

We have examined the complete public database of RXTE PCA observations of several neutron-star low-mass X-ray binaries, which now spans over 5 years. For the first time, we show the complete range of spectral variability observed from the ``atoll'' sources, which was previously unknown because (1) few atoll sources vary over a wide enough range of luminosity, and (2) earlier instruments did not observe these sources frequently enough on time scales longer than weeks. The patterns which atoll sources trace in X-ray color-color diagrams are tantalizingly similar to the shapes for which the more-luminous ``Z'' sources are named. We briefly discuss the observations that are needed to explore the similarities between these two classes of sources in more depth.

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