SIMBAD references

2025MNRAS.542.2943L - Mon. Not. R. Astron. Soc., 542, 2943-2952 (2025/October-1)

The X-ray source population of the metal-rich globular cluster NGC 6528.

LEAL B., OH K., STRADER J., DAGE K.C., ZEPF S.E., KIM S. and HUI C.Y.

Abstract (from CDS):

We present the first study of the X-ray sources in one of the most metal-rich globular clusters in the Galaxy, NGC 6528. Using relatively deep (66 ks) archival imaging from the Chandra X-ray Observatory, we identify 18 sources within the half-light radius of the cluster, all in the range $L_X \sim 10^{31}$-$10^{32}$ erg s$^{-1}$ (0.5-7 keV). By combining these data with photometry from the Hubble Space Telescope and other sources, we classify the X-ray sources as a likely mix of cataclysmic variables and active binaries, though one or more of the brighter objects could be a quiescent low-mass X-ray binary. For this cluster, it appears that the X-ray binary-enhancing effects of high metallicity are outweighed by the cluster's advanced dynamical evolution, leading to a relatively modest X-ray source population.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): stars: activity - binaries: close - Galaxy: globular clusters: individual: NGC 6528 - X-rays: binaries

Simbad objects: 5

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