The quasi-Roche lobe overflow state in the evolution of close binary systems containing a radio pulsar

We study the evolution of close binary systems formed by a normal (solar composition), intermediate-mass-donor star together with a neutron star. We consider models including irradiation feedback and evaporation. These nonstandard ingredients deeply modify the mass-transfer stages of these binaries....

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Autores principales: Benvenuto, Omar Gustavo, De Vito, María Alejandra, Horvath, J.E.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85908
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id I19-R120-10915-85908
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Binaries: Close
Pulsars: General
Pulsars: Individual (PSR J1723-2837)
Stars: Evolution
spellingShingle Ciencias Astronómicas
Binaries: Close
Pulsars: General
Pulsars: Individual (PSR J1723-2837)
Stars: Evolution
Benvenuto, Omar Gustavo
De Vito, María Alejandra
Horvath, J.E.
The quasi-Roche lobe overflow state in the evolution of close binary systems containing a radio pulsar
topic_facet Ciencias Astronómicas
Binaries: Close
Pulsars: General
Pulsars: Individual (PSR J1723-2837)
Stars: Evolution
description We study the evolution of close binary systems formed by a normal (solar composition), intermediate-mass-donor star together with a neutron star. We consider models including irradiation feedback and evaporation. These nonstandard ingredients deeply modify the mass-transfer stages of these binaries. While models that neglect irradiation feedback undergo continuous, long-standing mass-transfer episodes, models including these effects suffer a number of cycles of mass transfer and detachment. During mass transfer, the systems should reveal themselves as low-mass X-ray binaries (LMXBs), whereas when they are detached they behave as binary radio pulsars. We show that at these stages irradiated models are in a Roche lobe overflow (RLOF) state or in a quasi-RLOF state. Quasi-RLOF stars have radii slightly smaller than their Roche lobes. Remarkably, these conditions are attained for an orbital period as well as donor mass values in the range corresponding to a family of binary radio pulsars known as "redbacks." Thus, redback companions should be quasi-RLOF stars. We show that the characteristics of the redback system PSR J1723-2837 are accounted for by these models. In each mass-transfer cycle these systems should switch from LMXB to binary radio pulsar states with a timescale of approximately one million years. However, there is recent and fast growing evidence of systems switching on far shorter, human timescales. This should be related to instabilities in the accretion disk surrounding the neutron star and/or radio ejection, still to be included in the model having the quasi-RLOF state as a general condition.
format Articulo
Articulo
author Benvenuto, Omar Gustavo
De Vito, María Alejandra
Horvath, J.E.
author_facet Benvenuto, Omar Gustavo
De Vito, María Alejandra
Horvath, J.E.
author_sort Benvenuto, Omar Gustavo
title The quasi-Roche lobe overflow state in the evolution of close binary systems containing a radio pulsar
title_short The quasi-Roche lobe overflow state in the evolution of close binary systems containing a radio pulsar
title_full The quasi-Roche lobe overflow state in the evolution of close binary systems containing a radio pulsar
title_fullStr The quasi-Roche lobe overflow state in the evolution of close binary systems containing a radio pulsar
title_full_unstemmed The quasi-Roche lobe overflow state in the evolution of close binary systems containing a radio pulsar
title_sort quasi-roche lobe overflow state in the evolution of close binary systems containing a radio pulsar
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/85908
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