X-Ray Binary Systems – A Cauldron of Physical Processes

Giovannelli, F.

doi:10.22323/1.275.0031

Cited by 3 publications

(6 citation statements)

References 68 publications

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“…On the other hand, the low mass x-ray binaries show a decrease of the spin frequency with increasing orbital periods. The findings are in agreement with the discussion by [24].…”

Section: Objectsupporting

confidence: 93%

“…The values of the orbital periodicities estimated in the ongoing work allow to investigate the relation between the spin period and the orbital period discussed by [24], [14], using the known values of spin period [37]. The preliminary data reported in Fig.…”

Section: Objectmentioning

confidence: 99%

“…The X-ray sources have been classified by [22], [23], [24], [25], [26], [27], who discussed their physical properties and their importance as multiwavelength laboratories in detail. Among them, the X-ray binaries play a strong role.…”

Section: Introductionmentioning

confidence: 99%

“…The members of the latter subclass have orbits with negligible eccentricity and orbital periods smaller than a few days; the secondary is an OB star, while the X-ray emission is harder than 9 keV and nearly constant. The relation between the orbital period and the spin period of the X-ray pulsars shows a splitting of the HMXBs into separate subclasses: wind fed OB systems and Be systems (whose pulse periods behave as an increasing power of the orbital period) and disk fed systems (whose pulse periods behave as a decreasing power law of the orbital period) [24], [14]. The Low Mass X-ray Binary systems (LMXB) are also made of a collapsed object, either a neutron star or a black hole, and a secondary, a late type star.…”

Section: Introductionmentioning

confidence: 99%

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The importance of transient X-ray sources for gravitational wave physics

Poggiani¹

2017

Proceedings of Frontier Research in Astrophysics – II — PoS(FRAPWS2016)

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The recent discovery of gravitational waves has opened a new window in observational astronomy. The X-ray sources are interesting targets of gravitational astronomy, among them X-ray binaries. Accreting neutron stars are candidates for continuous emission of gravitational waves in the sensitivity band of the advanced LIGO/Virgo interferometers. The X-ray binaries are also potential emitters of low frequency gravitational radiation in the frequency band of the forthcoming space based interferometer eLISA. The accurate knowledge of the orbital period of the X-ray binaries is necessary to estimate the gravitational emission at low frequency and to reduce the computational cost of searching the signal from accreting neutron stars. The systematic search for periodicities in the archives of X-ray missions can detect the required orbital periods and, in addition, superorbital periods. The preliminary results of a search for periodicities in the Swift/BAT and RXTE/ASM archives is presented, showing also how the estimated periodicities can provide information about the characteristics of the astrophysical sources.

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“…On the other hand, the low mass x-ray binaries show a decrease of the spin frequency with increasing orbital periods. The findings are in agreement with the discussion by [24].…”

Section: Objectsupporting

confidence: 93%

Section: Objectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The importance of transient X-ray sources for gravitational wave physics

Poggiani¹

2017

Proceedings of Frontier Research in Astrophysics – II — PoS(FRAPWS2016)

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“…In the case of galactic compact sources, by using the softness and hardness ratios, coming for the measurements of the many X-ray satellites, it is possible to construct a diagram in which BHs in high state are separated by those in low state, and by other kind of objects, such as X-ray pulsars and other systems, as shown in Fig. 30 (Giovannelli, 2016, after Tanaka, 2001.…”

Section: Pos(multif2023)001mentioning

confidence: 99%

A Journey to Understand Our Universe

Giovannelli

2024

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources XIV — PoS(MULTIF2023)

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A Journey into the Universe Franco Giovannelli 4.10 Extragalactic background light 4.11 Unified model for compact sources 4.12 Jets in astrophysics 4.13 The tidal disruption of stars by massive black holes 4.14 Neutrinos 5. The challenge to know our universe 5.1 Big experiments 5.2 Small experiments 5.3 Active physics experiments 5.3.1 The Large Hadron Collider (LHC) 5.4 Passive physics experiments 5.4.1 The Cherenkov Telescope Array 5.4.2 ESO-Extremely Large Telescope 5.4.3 Canadian Hydrogen Intensity Mapping Experiment: CHIME 5.4.4 e-ASTROGAM observatory 5.4.5 Imaging X-ray Polarimetry Explorer (IXPE) 5.4.6 The James Webb Space Telescope (JWST) 5.4.7 The GAMMA-400 gamma-ray telescope 5.4.8 The BICEP (Background Imaging of Cosmic Extragalactic Polarization) and the Keck Array 5.4.9 LSPE (Large Scale Polarization Explorer) 5.4.10 QUBIC experiment 5.4.11 Square Kilometer Array 5.5 Cosmic Ray physics experiments 5.5.1 HAWC (High-Altitude Water Cherenkov Gamma-ray Observatory) 5.5.2 LHAASO (Large High Altitude Air Shower Observatory) 5.5.3 TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) 6. Habitable zone in the Milky Way and exoplanets 7. Origin of terrestrial life 7.1 The Cambrian explosion 7.2 Plant life 7.3 Animal life 7.4 The evolution of humans 7.5 What intelligent humanity is doing? 8. Great examples of synergy between astrophysics and history 9. The use of wisdom in physics 9.1 The classical T Tauri star RU Lupi 9.2 The cataclysmic variable SS Cygni 9.3 X-ray/Be systems PoS(MULTIF2023)001A Journey into the Universe Franco Giovannelli Conclusions and perspectivesA Journey into the Universe Franco Giovannelli Drouart et al. (1999) starting from the fact that each nebula disk is characterized by its initial mass M D , its initial radius R D , and the coefficient of turbulent viscosity α, they show that these parameters may be constrained by comparing temperature-density profiles to properly chosen physical and chemical Solar System data. They developed an analytical model that permits fruitful comparisons with available Solar System data and helpful constraints on the structure of the primitive solar nebula, as summarized below:• Theories of the formation of giant planets provide relatively weak constraints on the main parameters which define the nebula, namely the initial mass M D , the initial radius R D , and the coefficient of turbulent diffusion α. However, they conclude that forming the cores of giant planets in a time compatible with the lifetime of the nebula requires a α value equal to at least a few 10 −4 .• The enrichment in fossil deuterium enrichment in water with respect to the protosolar abundance is by far more constraining. At t = 0, R D must be between 8 and 28 AU, M D between 0.03 and 0.3 M ⊙ , and α must be between 0.003 and 1.• The high viscosity disks they infer (0.02 < α < 1) are characterized by a magnetohydrodynamic (MHD) turbulence while their low viscosity models (0.003 < α < 0.02) are charaterized by hydrodynamical turbulence. Other mechanisms susceptible ...

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The contribution of robotic telescopes to the knowledge of our Universe

Giovannelli

2023

caosp

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In this review I will discuss the importance of small telescopes for the advancement of knowledge of our Universe. The use of robotic telescopes scattered all over the world is fundamental. The results obtained complement those obtained with medium and large telescopes and with both small and large space experiments. Due to the limited space and my limited knowledge I will be forced to discuss some topics, important in my opinion, but which obviously do not pretend to permeate the entire field of astrophysics.

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X-Ray Binary Systems – A Cauldron of Physical Processes

Cited by 3 publications

References 68 publications

The importance of transient X-ray sources for gravitational wave physics

The importance of transient X-ray sources for gravitational wave physics

A Journey to Understand Our Universe

The contribution of robotic telescopes to the knowledge of our Universe

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