2024MNRAS.530...82K -
Mon. Not. R. Astron. Soc., 530, 82-94 (2024/May-1)
Chandra and HST studies of the X-ray sources in the globular cluster NGC 362.
KUMAWAT G., HEINKE C.O., COHN H.N. and LUGGER P.M.
Abstract (from CDS):
We analyse a Chandra observation of the rich globular cluster NGC 362, finding 33 X-ray sources within 1 arcmin (1.2 half-mass radii) of the cluster centre. Spectral analysis of the brightest source (X1) shows blackbody-like emission, indicating it is likely a quiescent low-mass X-ray binary; we find a possible counterpart that falls in the sub-subgiant region. We use Hubble Space Telescope ultraviolet (UV) Globular Cluster Survey photometry to identify 15 potential optical/UV counterparts to these X-ray sources, including two background active galactic nuclei. We identify no likely cataclysmic variables (CVs), probably due to crowding in optical filters in the core, though we predict of order 8 CVs among the detected X-ray sources. We identify three other sub-subgiants and two red straggler counterparts, which are likely powered by coronal activity, along with five other potential coronally active binary counterparts to three X-ray sources. Finally, we note two unusual counterpart candidates that lie to the red of the red giant branch in V606 - I814, and shift well to the blue of the red giant branch in ultraviolet colour-magnitude diagrams. These systems seem to contain a red giant with a distorted evolutionary history, plus a bright blue light source, either a blue straggler star (an Algol-like system) or an accreting white dwarf (a long-period CV, or a symbiotic star).
Abstract Copyright:
© 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
Journal keyword(s):
stars: activity - binaries: close - novae, cataclysmic variables - Hertzsprung-Russell and colour-magnitude diagrams - globular clusters: individual: NGC 362 - X-rays: binaries
Errata:
erratum vol. 536, p. 2972 (2025)
Status at CDS
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21
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