A propelling neutron star in the enigmatic Be-star γ Cassiopeia
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Título: | A propelling neutron star in the enigmatic Be-star γ Cassiopeia |
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Autor/es: | Postnov, Konstantin | Oskinova, Lidia M. | Torrejon, Jose M. |
Grupo/s de investigación o GITE: | Astronomía y Astrofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal |
Palabras clave: | Stars: emission-line | Be – stars: neutron |
Área/s de conocimiento: | Física Aplicada |
Fecha de publicación: | feb-2017 |
Editor: | Oxford University Press |
Cita bibliográfica: | Monthly Notices of the Royal Astronomical Society Letters. 2017, 465: L119-L123. doi:10.1093/mnrasl/slw223 |
Resumen: | γ Cassiopeia (γ Cas), is known to be a binary system consisting of a Be-type star and a low-mass (M ∼ 1 M⊙) companion of unknown nature orbiting in the Be-disc plane. Here, we apply the quasi-spherical accretion theory on to a compact magnetized star and show that if the low-mass companion of γ Cas is a fast spinning neutron star, the key observational signatures of γ Cas are remarkably well reproduced. Direct accretion on to this fast rotating neutron star is impeded by the propeller mechanism. In this case, around the neutron star magnetosphere a hot shell is formed which emits thermal X-rays in qualitative and quantitative agreement with observed properties of the X-ray emission from γ Cas. We suggest that γ Cas and its analogues constitute a new subclass of Be-type X-ray binaries hosting rapidly rotating neutron stars formed in supernova explosions with small kicks. The subsequent evolutionary stage of γ Cas and its analogues should be the X Per-type binaries comprising low-luminosity slowly rotating X-ray pulsars. The model explains the enigmatic X-ray emission from γ Cas, and also establishes evolutionary connections between various types of rotating magnetized neutron stars in Be-binaries. |
Patrocinador/es: | The work of KP is supported by RSF grant 16-12-10519. JMT acknowledges the research grant ESP2014-53672-C3-3-P and LO acknowledges the DLR grant 50 OR 1508. |
URI: | http://hdl.handle.net/10045/61750 |
ISSN: | 1745-3925 (Print) | 1745-3933 (Online) |
DOI: | 10.1093/mnrasl/slw223 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1093/mnrasl/slw223 |
Aparece en las colecciones: | INV - Astronomía y Astrofísica - Artículos de Revistas |
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