Marginally Stable Nuclear Burning on Accreting Neutron Stars

Details Marginally Stable Nuclear Burning on Accreting Neutron Stars Marginally Stable Nuclear Burning on Accreting Neutron Stars

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0203c&link_type=abstract

American Astronomical Society, HEAD meeting #9, #2.03; Bulletin of the American Astronomical Society, Vol. 38, p.344

Astronomy and Astrophysics

Astronomy

Scientific paper

I discuss marginally stable nuclear burning as an explanation for the mHz QPOs observed from three Atoll sources, revealed by long term monitoring of X-ray bursters. At the boundary between unstable and stable nuclear burning, oscillations naturally occur which match the observed QPO frequencies, amplitudes, and the fact that they are observed only in a narrow range of luminosities. This is the first secure identification of a QPO phenomenon with the neutron star surface. I discuss the fact that several observed properties of nuclear burning change at the luminosity where mHz QPOs are observed, such as the presence or absence of superbursts and burst oscillations. I propose that these changes are due to a change in the covering fraction of accreted fuel, driven by a change in accretion geometry from island to banana states.

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