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Home All issues Volume 697 (May 2025) A&A, 697 (2025) A215 Full HTML
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Table A.1

High-confidence optical counterparts identified in this work.

Name HUGS ID R.A. Dec. d mF225W mF275W mF390W mF435W mF555W mF814W Membership Criteria Notes
[∘] [∘] [′′] [mag] [mag] [mag] [mag] [mag] [mag] probability
X1c R0077953 15.8119957 −70.8488898 0.06 20.32 19.27 18.86 18.64 18.34 17.61 1.00 Unique candidate qLMXB * (?)
X2c − 15.8188075 −70.8502508 0.08 22.89 22.20 − − − − − CMD CV
X4c R0113456 15.7570819 −70.8381431 0.09 22.70 22.23 22.5 − 22.57 21.54 0.00 CMD Galaxy *
X5c R0088605 15.8181305 −70.8467920 0.03 25.54 25.05 24.41 − 23.76 22.99 0.31 CMD + Variability BW MSP or CV
X6c − 15.8111520 −70.8482723 0.13 23.77 23.44 23.27 22.03 23.02 21.80 0.09 CMD + Hα CV
X7c − 15.8139031 −70.8485905 0.06 22.26 21.17 20.66 20.31 20.05 19.17 − Variability AB or RB MSP
X8c R0004525 15.8058206 −70.8503698 0.11 21.36 19.79 18.70 18.35 17.93 16.99 0.50 Hα AB
X9c R0005396 15.8031461 −70.8481876 0.10 19.65 18.59 17.96 17.78 17.27 16.19 0.87 CMD RG + blue object *
X10c R0006360 15.8422514 −70.8457921 0.18 19.82 18.66 17.87 − 16.82 15.67 0.32 CMD + RV var semi-detached binary system
X12c R0005116 15.8187085 −70.8489012 0.11 21.34 19.73 18.59 18.25 17.62 16.51 0.91 CMD + RV var RSS *
X13c R0068161 15.8175106 −70.8513261 0.46 − 23.97 22.35 21.92 21.44 20.41 0.52 Hα AB
X15c R0089306 15.8056443 −70.8462507 0.05 − − 19.16 18.87 18.21 17.08 0.46 CMD SSG * or MSP
X16Ac6 R0078991 15.8038772 −70.8494455 0.15 22.59 21.08 19.7 19.34 18.78 17.68 0.68 CMD SSG * or MSP
X16Bc R0072542 15.8040431 −70.8495953 0.53 18.62 17.98 17.84 17.61 17.53 17.08 0.34 CMD + Variability + RV var WUMa
X17c − 15.8088114 −70.8448532 0.13 22.56 22.18 − − − − − CMD CV in outburst
X18Ac − 15.8025839 −70.8511724 0.24 23.45 23.25 24.80 − 22.64 21.48 − CMD CV or canonical MSP
X18Bc − 15.8026443 −70.8510299 0.45 24.19 23.74 22.96 23.01 21.35 20.45 − CMD CV or canonical MSP
X19c − 15.8127189 −70.8580322 0.67 25.37 24.36 25.08 − 25.05 − − CMD CV or canonical MSP
X20c R0002866 15.8033216 −70.8549707 0.11 22.13 20.50 19.25 − 18.32 17.22 0.89 CMD + Hα SSG * or MSP
X21Ac R0004837 15.7943940 −70.8496118 0.22 21.24 19.52 18.16 − 17.15 16.06 0.48 CMD + RV var RSS *
X21Bc7 − 15.7944000 −70.8497595 0.48 − − 24.84 24.07 21.87 0.00 CMD BW MSP or CV
X23c8 R0005147 15.8085802 −70.8488293 0.18 17.97 17.27 17.47 16.77 17.08 16.92 0.92 CMD + Variability + Hα close eclipsing binary BSS
X24Ac R0029822 15.8526754 −70.8636441 0.38 22.05 21.75 22.61 − 21.80 20.72 0.01 CMD Galaxy *
X24Bc R0001102 15.8526677 −70.8637183 0.39 21.01 19.75 19.07 − 18.42 17.54 0.86 CMD SSG or MSP
X25Ac − 15.8072321 −70.8517652 0.60 21.54 21.45 22.42 22.20 21.52 20.44 0.02 CMD CV
X25Bc R0067240 15.8081627 −70.8517508 0.50 21.48 20.52 20.16 19.92 19.70 18.99 0.40 CMD + Hα AB
X28c R0067261 15.8112529 −70.8511236 0.67 23.55 23.31 − − − 22.35 0.00 CMD CV or canonical MSP
X33c − 15.8085784 −70.8477017 0.77 21.53 20.38 − − − − − Variability RB MSP or AB

Notes. The table provides, from left to right: the name of the optical counterpart, its ID in the HUGS catalogue (‘-’ if the source is absent from the catalogue), right ascension, declination, distance from the X-ray source position, mF225W, mF275W, mF390W, mF435W, mF555W, and mF814W magnitudes obtained from our photometric analysis (‘-’ if not detected), and membership probability (‘-’ if unavailable). We mark the name of the optical counterparts with a ‘c’ as a superscript. For X-ray sources with multiple candidate counterparts, we distinguish among different candidates by appending a capital letter to their names, starting from ‘A’. The ‘Criteria’ column outlines the selection criteria that we used for including the counterparts in the list, where ‘CMD’ refers to a peculiar position in the CMD, ‘RV var’ marks the presence of variability in the RV curves and ‘Hα’ indicates the presence of Hα excess. The last column provides the possible interpretation of the system, with the ‘*’ superscript indicating that the interpretation was proposed by Kumawat et al. (2024).

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