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@article{42104,
author = {Bakala, Pavel and Stuchlík, Zdeněk and Šrámková, Eva and Török, Gabriel and Urbanec, Martin},
article_location = {CA - Kanada},
article_number = {1},
doi = {http://dx.doi.org/10.1088/0004-637X/714/1/748},
keywords = {HIGH-FREQUENCY QPOS, EQUATION-OF-STATE, X-RAY BINARIES, ACCRETING NEUTRON-STARS, SOURCE 4U 1636-53, BLACK-HOLE, GENERAL-RELATIVITY, DISK OSCILLATIONS, ATOLL SOURCE, KHZ QPOS},
language = {eng},
issn = {0004-637X},
journal = {Astrophysical Journal},
title = {ON MASS CONSTRAINTS IMPLIED BY THE RELATIVISTIC PRECESSION MODEL OF TWIN-PEAK QUASI-PERIODIC OSCILLATIONS IN CIRCINUS X-1},
volume = {714},
year = {2010}
}
TY - JOUR
ID - 42104
AU - Bakala, Pavel - Stuchlík, Zdeněk - Šrámková, Eva - Török, Gabriel - Urbanec, Martin
PY - 2010
TI - ON MASS CONSTRAINTS IMPLIED BY THE RELATIVISTIC PRECESSION MODEL OF TWIN-PEAK QUASI-PERIODIC OSCILLATIONS IN CIRCINUS X-1
JF - Astrophysical Journal
VL - 714
IS - 1
SP - 748-757
EP - 748-757
SN - 0004637X
KW - HIGH-FREQUENCY QPOS, EQUATION-OF-STATE, X-RAY BINARIES, ACCRETING NEUTRON-STARS, SOURCE 4U 1636-53, BLACK-HOLE, GENERAL-RELATIVITY, DISK OSCILLATIONS, ATOLL SOURCE, KHZ QPOS
N2 - Boutloukos et al. discovered twin-peak quasi-periodic oscillations (QPOs) in 11 observations of the peculiar Z-source Circinus X-1. Among several other conjunctions the authors briefly discussed the related estimate of the compact object mass following from the geodesic relativistic precession model for kHz QPOs. Neglecting the neutron star rotation they reported the inferred mass M-0 = 2.2 +/- 0.3 M-circle dot. We present a more detailed analysis of the estimate which involves the frame-dragging effects associated with rotating spacetimes. For a free mass we find acceptable fits of the model to data for (any) small dimensionless compact object angular momentum j = cJ/GM(2). Moreover, quality of the fit tends to increase very gently with rising j. Goodfits are reached when M similar to M-0[1 + 0.55(j + j(2))].
ER -
BAKALA, Pavel, Zdeněk STUCHLÍK, Eva ŠRÁMKOVÁ, Gabriel TÖRÖK and Martin URBANEC. ON MASS CONSTRAINTS IMPLIED BY THE RELATIVISTIC PRECESSION MODEL OF TWIN-PEAK QUASI-PERIODIC OSCILLATIONS IN CIRCINUS X-1. \textit{Astrophysical Journal}. CA - Kanada, 2010, vol.~714, No~1, p.~748-757, 9 pp. ISSN~0004-637X. Available from: https://dx.doi.org/10.1088/0004-637X/714/1/748.
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