Recycled Pulsars

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Recycled Pulsars

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Author : Bryan Anthony Jacoby
language : en
Publisher: Universal-Publishers
Release Date : 2008

Recycled Pulsars written by Bryan Anthony Jacoby and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Science categories.

We present the results of a large-area survey for millisecond pulsars (MSPs) at moderately high galactic latitudes with the 64 m Parkes radio telescope, along with follow-up timing and optical studies of the newly-discovered pulsars and several others. Major results include the first precise measurement of the mass of a fully recycled pulsar and measurement of orbital period decay in a double neutron star binary system allowing a test of general relativity along with improved measurements of the neutron star masses. In a survey of approx. 4,150 square degrees, we discovered 26 previously unknown pulsars, including 7 "recycled" millisecond or binary pulsars. Several of these recycled pulsars are particularly interesting: PSR J1528-3146 is in a circular orbit with a companion of at least 0.94 solar masses; it is a member of the recently recognized class of intermediate mass binary pulsar (IMBP) systems with massive white dwarf companions. We have detected optical counterparts for this and one other IMBP system; taken together with optical detections and non-detections of several similar systems, our results indicate that the characteristic age consistently overestimates the time since the end of mass accretion in these recycled systems. This result implies that the pulsar spin period at the end of the accretion phase is not dramatically shorter than the observed period as is generally assumed. PSR J1600-3053 is among the best high-precision timing pulsars known and should be very useful as part of an ensemble of pulsars used to detect very low frequency gravitational waves. PSR J1738+0333 has an optical counterpart which, although not yet well-studied, has already allowed a preliminary measurement of the system's mass ratio. The most significant discovery of this survey is PSR J1909-3744, a 2.95 ms pulsar in an extremely circular 1.5 d orbit with a low-mass white dwarf companion. Though this system is a fairly typical low-mass binary pulsar (LMBP) system, it has several exceptional qualities: an extremely narrow pulse profile and stable rotation have enabled the most precise long-term timing ever reported, and a nearly edge-on orbit gives rise to a strong Shapiro delay signature in the pulse timing data which has allowed the most precise measurement of the mass of a millisecond pulsar: 1.438 ± 0.024 solar masses. Our accurate parallax distance measurement, d = 1.14 +0.08 / -0.07 kpc, combined with the mass of the optically-detected companion, 0.2038 ± 0.022 solar masses, will provide an important calibration for white dwarf models relevant to other LMBP companions. We have measured the decay of the binary period of the double neutron star system B2127+11C in the globular cluster M15. This has allowed an improved measurement of the mass of the pulsar, 1.3584 ± 0.0097 solar masses, and companion, 1.3544 ± 0.0097 solar masses, as well as a test of general relativity at the 3% level. We find that the proper motions of this pulsar as well as B2127+11A and B2127+11B are consistent with each other and with one published measurement of the cluster proper motion. We have discovered three binary millisecond pulsars in the globular cluster M62 using the 100-m Green Bank Telescope (GBT). These pulsars are the first objects discovered with the GBT. We briefly describe a wide-bandwidth coherent dedispersion backend used for some of the high precision pulsar timing observations presented here.

X Ray Binaries And Recycled Pulsars

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Author : E.P. van den Heuvel
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

X Ray Binaries And Recycled Pulsars written by E.P. van den Heuvel and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

Proceedings of the NATO Advanced Research Workshop on X-Ray Binaries and the Formation of Binary and Millisecond Radio Pulsars, Santa Barbara, CA, U.S.A., Januari 21-25, 1991

Stellar Remnants

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Author : S.D. Kawaler
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-04-18

Stellar Remnants written by S.D. Kawaler and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-04-18 with Science categories.

Three eminent scientists, each well known for the clarity of their writing, present for students and researchers what is known about the internal structure, origin and evolution of White Dwarfs, Neutron Stars and Black Holes, all objects at the final stage of stellar evolution. They cover fascinating topics such as pulsation of white dwarfs, millisecond pulsars or the dynamics around black holes. The book is written for graduate students in astrophysics, but is also of interest to professional astronomers and physicists.

Neutron Stars And Their Birth Events

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Author : Wolfgang Kundt
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Neutron Stars And Their Birth Events written by Wolfgang Kundt and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.

This volume is the documentation of the second Course on 'Neutron Stars, Active Galactic Nuclei and Jets', held at Erice in September 1988. This second Course was devoted to our knowledge about neutron-star sources. The poster spoke of: pulsars, accreting X-ray sources and jet englnes, perhaps also UHE pulsars, X ra~' bursters and black-hole candidat.es. Neutron stars have even been proposed as the primary cosmic-ray boosters. Most of theil' properties are stil1 controversial, such as their birth mechanism (neutrino versus magnetic piston), internal structure (neutrons, quarks, strange particles), magnetic, thermal and spin histories, wind generation (hydrogen versus pair plasma, radiation versus centrifugal pressure), magnetospheric structure and accretion modes (along field lines versus quasi-Keplerian). The listed controversies have largely survived through the Course and entered into the proceedings. Several lecturers speak of 'magnetic-field decay' in neutron stars, of the 'recycling' of old pulsars, and of 'accretion-induced collapse' of white dwarfs as though such processes were textbook knowledge. Terms and abbreviations like RPSR (=recycled pulsar), spinup line, AIC, and ADC (=accretion disk corona) help to foster the assumptions. It is not clear to me at this time whether any of these notions has an application to reality.

High Energy Astrophysics Compact Stars And Active Galaxies Proceedings Of The 3rd Chinese Academy Of Sciences And Max Planck Society Workshop

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Author : Qi Bin Li
language : en
Publisher: World Scientific
Release Date : 1991-08-27

High Energy Astrophysics Compact Stars And Active Galaxies Proceedings Of The 3rd Chinese Academy Of Sciences And Max Planck Society Workshop written by Qi Bin Li and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-08-27 with categories.

This volume is concerned with the broad areas related to high energy astrophysics stressing the processes in the compact objects and active galaxies. The subject matter encompasses the interpretation of many high energy astrophysical processes such as accretion disk, relativistic ejection, superluminal motion, gravitational lens, clustering of galaxies and observations on binary system, cataclysmic variables, X-ray sources, QSOs and BL Lac objects.

Binary Radio Pulsars

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Author : Fred A. Rasio
language : en
Publisher:
Release Date : 2005

Binary Radio Pulsars written by Fred A. Rasio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Astronomy categories.

Millisecond Pulsars

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Author : Andrew S. Fruchter
language : en
Publisher:
Release Date : 1995

Millisecond Pulsars written by Andrew S. Fruchter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Science categories.

A Decade Of Accreting Millisecond X Ray Pulsars

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Author : Rudy Wijnands
language : en
Publisher: American Institute of Physics
Release Date : 2008-12-02

A Decade Of Accreting Millisecond X Ray Pulsars written by Rudy Wijnands and has been published by American Institute of Physics this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-12-02 with Science categories.

In X-ray binaries, neutron stars (the very dense stellar remnants of heavy stars) accrete matter from a close-by companion star. This matter eventually falls on the neutron star, significantly affecting it. I.e., the star is spun up to very high spin rates. In the end, it might rotate 1000 times a second which causes very fast oscillations in its X-ray brightness. This workshop was to celebrate the 10th anniversary of the discovery of the first system in which this signal was found and discuss the most recent observational and theoretical insight in the nature of these systems.

Planets Around Pulsars

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Author : J. A. Phillips
language : en
Publisher:
Release Date : 1993

Planets Around Pulsars written by J. A. Phillips and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Science categories.

Radio Pulsars

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Author : Matthew Bailes
language : en
Publisher:
Release Date : 2003

Radio Pulsars written by Matthew Bailes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Science categories.