dc.creator | Méndez, Mariano R. | |
dc.creator | Klis, Michiel van der | |
dc.creator | Ford, Eric C. | |
dc.date | 2001 | |
dc.date | 2019-11-04T12:46:19Z | |
dc.identifier | http://sedici.unlp.edu.ar/handle/10915/84694 | |
dc.identifier | issn:0004-637X | |
dc.description | We study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728-34, 4U 1608-52, and Aq1 X-1. Each source traces out a set of nearly parallel tracks in a frequency versus X-ray count rate diagram. We find that between two of these tracks, for similar QPO frequency, the 2-60 keV source count rate can differ by up to a factor of ∼4, whereas at the same time the rms amplitude of the kHz QPOs is only a factor of ∼1.1 different. We also find that, for 4U 1608-52 and Aq1 X-1, the rms spectrum of the kHz QPOs does not depend upon which track the source occupies in the frequency versus X-ray count rate diagram. Our results for 4U 1728-34, 4U 1608-52, and Aq1 X-1 are inconsistent with simple "extra source of X-rays" scenarios for the parallel tracks, such as those in which the properties of the kHz QPOs are determined only by the mass accretion rate through the disk, whereas X-ray count rate also depends upon other sources of energy that do not affect the QPOs. | |
dc.description | Facultad de Ciencias Astronómicas y Geofísicas | |
dc.format | application/pdf | |
dc.format | 1016-1026 | |
dc.language | en | |
dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
dc.subject | Ciencias Astronómicas | |
dc.subject | Accretion, accretion disks | |
dc.subject | Stars: individual (4U 1608-52, 4U 1728-34, Aquila X-1) | |
dc.subject | Stars: neutron | |
dc.subject | X-rays: stars | |
dc.title | The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity | |
dc.type | Articulo | |
dc.type | Articulo | |