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Using X-Rays to Probe the Compact Binary Content of Globular Clusters

Published online by Cambridge University Press:  22 February 2018

N. A. Webb ,
B. Gendre  and
D. Barret
N. A. Webb
Affiliation:
CESR, Toulouse, France
B. Gendre
Affiliation:
CESR, Toulouse, France
D. Barret
Affiliation:
CESR, Toulouse, France

Abstract

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Globular clusters (GCs) harbour a large number of close binaries which are hard to identify optically due to high stellar densities. Observing these GCs in X-rays, in which the compact binaries are bright, diminishes the over-crowding problem. Using the new generation of X-ray observatories, it is possible to identify populations of neutron star low mass X-ray binaries, cataclysmic variables and millisecond pulsars as well as other types of binaries. We present the spectra of a variety of binaries that we have identified in four GCs observed by XMM-Newton. We show that through population studies we can begin to understand the formation of individual classes of binaries in GCs and hence start to unfold the complex evolutionary paths of these systems.

Resumen

Resumen

Los cúmulos globulares (GCs) albergan un gran número de binarias cerradas que son difíciles de identificar ópticamente debido a las altas densidades estelares. Observando estos GCs en rayos X donde las binarias compactas son brillantes podemos disminuir este problema. Utilizando los observatorios de rayos X de nueva generación es posible identificar poblaciones de binarias de rayos X de estrellas de neutrones de baja masa, variables cataclísmicas, pulsares de milisegundos y también otros tipos de binarias. Presentamos los espectros de una variedad de binarias que hemos identificado en cuatro GCs observados por XMM-Newton. Mostramos que basándonos en estudios de poblaciones podemos empezar a entender la formación de las clases individuales de binarias en GCs y comenzar a revelar los caminos evolutivos de estos sistemas.

Keywords

Globular ClustersGeneral — StarsNeutron — X-RaysBinaries
Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 75 - 76
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

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