Results 31 to 40 of about 1,363 (263)

High-Frequency Variability in Neutron-Star Low-Mass X-ray Binaries [PDF]

, 2020
Binary systems with a neutron-star primary accreting from a companion star display variability in the X-ray band on time scales ranging from years to milliseconds. With frequencies of up to ~1300 Hz, the kilohertz quasi-periodic oscillations (kHz QPOs) represent the fastest variability observed from any astronomical object.
Méndez, Mariano, Belloni, Tomaso M., Zhang, Chengmin   +2 more
openaire   +3 more sources

Massive Stars and their Compact Remnants in High-mass X-ray Binaries

, 2005
In a high-mass X-ray binary (HMXB) a massive star interacts with a neutron-star or black-hole companion in various ways. The gravitational interaction enables the measurement of fundamental parameters such as the mass of both binary components, providing important constraints on the evolutionary history of the system, the equation of state of matter at
Kaper, L., van der Meer, A.
openaire   +3 more sources

A New Class of High‐Mass X‐Ray Binaries: Implications for Core Collapse and Neutron Star Recoil [PDF]

The Astrophysical Journal, 2002
We investigate an interesting new class of high-mass X-ray binaries (HMXBs) with long orbital periods (P_orb > 30 days) and low eccentricities ...
Pfahl, E., Rappaport, S., Podsiadlowski, P., Spruit, H.   +3 more
openaire   +5 more sources

Clumpy wind accretion in supergiant neutron star high mass X-ray binaries [PDF]

Astronomy & Astrophysics, 2016
The accretion of the stellar wind material by a compact object represents the main mechanism powering the X-ray emission in classical supergiant high mass X-ray binaries and supergiant fast X-ray transients. In this work we present the first attempt to simulate the accretion process of a fast and dense massive star wind onto a neutron star, taking into
Bozzo, Enrico, Oskinova, Lidia M. (Dr.), Feldmeier, Achim, Falanga, M.   +3 more
openaire   +3 more sources

Preliminary determinations of the masses of the neutron star and mass donor in the high mass X-ray binary system EXO 1722–363 [PDF]

Astronomy and Astrophysics, 2010
We intended to measure the radial velocity curve of the supergiant companion to the eclipsing high mass X-ray binary pulsar EXO1722-363 and hence determine the stellar masses of the components. We used a set of archival K$_{\rm s}$-band infrared spectra of the counterpart to EXO1722-363 obtained using ISAAC on the VLT, and cross-correlated them in ...
Mason, A. B., Norton, A. J., Clark, J. S., Negueruela, I., Roche, P.   +4 more
openaire   +3 more sources

Additive Gaussian Process Regression for Predictive Design of High‐Performance, Printable Silicones

Advanced Engineering Materials, EarlyView.
A chemistry‐aware design framework for tuning printable polydimethylsiloxane (PDMS) for vat photopolymerization (VPP) is developed using additive Gaussian process (GP) modeling. Polymer network mechanics informs variable groupings, feasible formulation constraints, and interaction variables.
Roxana Carbonell, Martha Leach, Hongtao Song, Carolyn Seepersad   +3 more
wiley   +1 more source

Measurement of the Orbital Parameters, Spin, and Spectral Evolution during the Main High State of Her X-1 with Insight-HXMT

The Astrophysical Journal
Based on Insight-HXMT observations, we present a detailed timing analysis and spectral evolution of a complete main high state for Her X-1 in 2020 February. We determine an accurate local ephemeris using the Rmer delay measured from five eclipses.
Wen Yang, Wei Wang, Qianhan Zhou
doaj   +1 more source

Neutron star masses from hydrodynamical effects in obscured supergiant high mass X-ray binaries [PDF]

Astronomy & Astrophysics, 2012
Context. A population of obscured supergiant high mass X-ray binaries has been discovered by INTEGRAL. X-ray wind tomography of IGR J17252-3616 inferred a slow wind velocity to account for the enhanced obscuration. Aims. The main goal of this study is to understand under which conditions high obscuration could occur. Methods.
A. Manousakis, R. Walter, J. M. Blondin
openaire   +1 more source

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source