Mass-angular-momentum relations implied by models of twin peak quasi-periodic oscillations

@article{45220,
   author = {Bakala, Pavel and Goluchová, Kateřina and Stuchlík, Zdeněk and Šrámková, Eva and Török, Gabriel and Urbanec, Martin},
   article_location = {GB - Spojené království Velké Británie a},
   article_number = {2},
   doi = {http://dx.doi.org/10.1088/0004-637X/760/2/138},
   keywords = {Stars: neutron; X-rays: binaries},
   language = {eng},
   issn = {0004-637X},
   journal = {Astrophysical Journal},
   title = {Mass-angular-momentum relations implied by models of twin peak quasi-periodic oscillations},
   url = {https://iopscience.iop.org/article/10.1088/0004-637X/760/2/138/pdf},
   volume = {760},
   year = {2012}
}

TY  - JOUR
ID  - 45220
AU  - Bakala, Pavel - Goluchová, Kateřina - Stuchlík, Zdeněk - Šrámková, Eva - Török, Gabriel - Urbanec, Martin
PY  - 2012
TI  - Mass-angular-momentum relations implied by models of twin peak quasi-periodic oscillations
JF  - Astrophysical Journal
VL  - 760
IS  - 2
SN  - 0004637X
KW  - Stars: neutron
KW  - X-rays: binaries
UR  - https://iopscience.iop.org/article/10.1088/0004-637X/760/2/138/pdf
N2  - Twin peak quasi-periodic oscillations (QPOs) appear in the X-ray power-density spectra of several accreting low-mass neutron star (NS) binaries. Observations of the peculiar Z-source Circinus X-1 display unusually low QPO frequencies. Using these observations, we have previously considered the relativistic precession (RP) twin peak QPO model to estimate the mass of the central NS in Circinus X-1. We have shown that such an estimate results in a specific mass-angular-momentum (M - j) relation rather thana single preferred combination of M and j. Here we confront our previous results with another binary, the atoll source 4U 1636-53 that displays the twin peak QPOs at very high frequencies, and extend the consideration to various twin peak QPO models. Inanalogy to the RP model, we find that these imply their own specific M - j relations. We explore these relations for both sources and note differences in the ? 2 behavior that represent a dichotomy between high- and low-frequency sources
ER  - 

BAKALA, Pavel, Kateřina GOLUCHOVÁ, Zdeněk STUCHLÍK, Eva ŠRÁMKOVÁ, Gabriel TÖRÖK and Martin URBANEC. Mass-angular-momentum relations implied by models of twin peak quasi-periodic oscillations. \textit{Astrophysical Journal}. GB - Spojené království Velké Británie a, 2012, vol.~760, No~2, 15 pp. ISSN~0004-637X. Available from: https://dx.doi.org/10.1088/0004-637X/760/2/138.