Results 101 to 110 of about 847,988 (312)

Testing f(R)-Theories by Binary Pulsars

Acta Polytechnica CTU Proceedings, 2014
Using the Post-Keplerian parameters to obtain, in the Minkowskian limit we obtain constraints on f(R)-theories of gravity from the first time derivative of the orbital period of a sample of binary stars. In the approximation in which the theory is Taylor
Mariafelicia De Laurentis, Ivan De Martino   +1 more
doaj   +1 more source

Double and single recycled pulsars: an evolutionary puzzle? [PDF]

, 2010
We investigate the statistics of isolated recycled pulsars and double neutron star binaries in the Galactic disk. Since recycled pulsars are believed to form through accretion and spinup in close binaries, the isolated objects presumably originate from ...
Abbott, Archibald, Arzoumanian, Bailes, Barziv, Belczynski, Belczynski, Belczynski, Belczynski, Belczynski, Belczynski, Belczynski, Belczynski, Belczynski, Belczynski, Bethe, Bhattacharya, Brown, Burgay, Burgay, Camilo, Champion, Chaurasia, Chen, D. R. Lorimer, David, Dessart, Dewi, Dewi, Dewi, Druckier, Eldridge, Eldridge, Faucher-Giguere, Faulkner, Faulkner, Fryer, Hamann, Hobbs, Hulse, Hurley, Ihm, Ivanova, J. P. Ridley, Jacoby, Jacoby, Johnston, K. Belczynski, Kalogera, Keith, Kim, Kitaura, Kiziltan, Kramer, Linden, Lorimer, Lorimer, Lorimer, Lorimer, Lorimer, Lyne, Lyne, Manchester, Manchester, Manchester, Nice, Nomoto, Pfahl, Pfahl, Phinney, Piran, Podsiadlowski, Portegies Zwart, Ransom, Ricker, Ridley, Ruffert, S. J. Curran, Stairs, Timmes, Webbink, Willems, Wolszczan, Zdunik   +83 more
core   +3 more sources

The Role of XMM–Newton in the Investigation of Persistent BeXRBs

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT The persistent BeXRBs are a class of high‐mass X‐ray binaries (HMXRBs), which are characterized by persistent low X‐ray luminosities (LX~1034$$ {L}_{\mathrm{X}}\sim {10}^{34} $$ erg s −1$$ {}^{-1} $$) and wide (Porb>$$ {P}_{\mathrm{orb}}> $$ 30 days), almost circular orbits. In these sources the NS is slowly rotating (with Pspin$$ {P}_{\mathrm{
Nicola La Palombara, Lara Sidoli, Sandro Mereghetti, Gian Luca Israel, Paolo Esposito   +4 more
wiley   +1 more source

On secular effects in the binary pulsar [PDF]

Monthly Notices of the Royal Astronomical Society, 1984
L'interpretation de Lapiedra, Portilla et Sanz sur les observations de pulsars binaires est incorrecte. On explique leur erreur et on donne une discussion detaillee de la correspondance entre les quantites observables et diverses constructions newtoniennes et post ...
openaire   +3 more sources

Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars

The Astrophysical Journal
We report pulse-profile modeling of a sample of 23 X-ray binary pulsars observed with the Suzaku X-ray satellite. These pulsars have spin periods ranging from 0.7 to 9400 s, and their X-ray emission is powered by the accretion from their stellar ...
Silas G. T. Laycock, Rigel C. Cappallo, Pragati Pradhan, Dimitris M. Christodoulou, Biswajit Paul   +4 more
doaj   +1 more source

Discovery and Timing of Millisecond Pulsars with the Arecibo 327 MHz Drift-scan Survey

The Astrophysical Journal, 2023
We present the discovery and timing solutions of four millisecond pulsars (MSPs) discovered in the Arecibo 327 MHz Drift-Scan Pulsar Survey. Three of these pulsars are in binary systems, consisting of a redback (PSR J2055+1545), a black widow (PSR J1630 ...
Evan F. Lewis, Timothy E. E. Olszanski, Julia S. Deneva, Paulo C. C. Freire, Maura A. McLaughlin, Kevin Stovall, Manjari Bagchi, Jose G. Martinez, Benetge B. P. Perera   +8 more
doaj   +1 more source

New Binary and Millisecond Pulsars from Arecibo Drift-Scan Searches [PDF]

, 2004
We discuss four recycled pulsars found in Arecibo drift-scan searches. PSR J1944+0907 has a spin period of 5.2 ms and is isolated. The 5.8-ms pulsar J1453+19 may have a low-mass companion.
Arzoumanian, Z., Backer, D. C., Champion, D. J., Cordes, J. M., Fruchter, A. S., Lommen, A. N., Lorimer, D. R., McLaughlin, M. A., Xilouris, K. M.   +8 more
core  

The orthometric parametrization of the Shapiro delay and an improved test of general relativity with binary pulsars [PDF]

, 2010
In this paper, we express the relativistic propagational delay of light in the space-time of a binary system (commonly known as the 'Shapiro delay') as a sum of harmonics of the orbital period of the system. We do this first for near-circular orbits as a
P. Freire, N. Wex
semanticscholar   +1 more source

Beyond Accretion Limits: The Rise of Pulsating Gems

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT The discovery of several ultraluminous X‐ray sources exhibiting fast and rapidly evolving X‐ray pulsations unequivocally associates these sources with accreting neutron stars orbiting relatively massive companion stars (> 8M ⊙$$ {}_{\odot } $$).
Gian Luca Israel, Roberta Amato, Matteo Imbrogno, Nicoló Oreste Pinciroli Vago, on behalf of a Larger Team, Guillermo Andres Rodríguez Castillo, Andrea Belfiore, Luigi Stella, Matteo Bachetti, Felix Fürst, Dom Walton, Matthew Middleton, Murray Brightman, Fabio Pintore, Ciro Pinto, Silvia Conforti, Luca Zampieri, Chiara Salvaggio, Anna Wolter, Andrea Tiengo, Andrea De Luca, Paolo Esposito, Ruben Salvaterra, Hannah Earnshaw, Tim Roberts, Andres Gúrpide, Sara Motta   +26 more
wiley   +1 more source

Measuring the Lense–Thirring Orbital Precession and the Neutron Star Moment of Inertia with Pulsars

Universe
Neutron stars (NSs) are compact objects that host the densest forms of matter in the observable universe, providing unique opportunities to study the behaviour of matter at extreme densities.
Huanchen Hu, Paulo C. C. Freire
doaj   +1 more source