X-ray properties of RR Lyrae and Cepheid variables from eROSITA

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Volume 705 (January 2026)

A&A, 705 (2026) A231

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Table 1.

RR Lyrae stars with likely X-ray counterparts in the 0.2–2.3 keV range.

Name	Type	Sep	posErr	σ_DET	Distance	Flux	Luminosity
		[arcsec]	[arcsec]		[pc]	[mW m⁻²]	[erg s⁻¹]
OGLE-BLG-RRLYR-00252	RRab	3.07	3.11	19.5	$168 . 10_{- 0.53}^{+ 0.56}$ $168.10_{-0.53}^{+0.56}$	(1.07 ± 0.34)×10⁻¹³	$3 . 62_{- 1.17}^{+ 1.18} \times 10^{29}$ $3.62_{-1.17}^{+1.18} \times 10^{29}$
OGLE-GD-RRLYR-03705	RRc	3.52	4.71	9.80	$6528_{- 1746}^{+ 2452}$ $6528_{-1746}^{+2452}$	(4.00 ± 1.86)×10⁻¹⁴	$2 . 04_{- 1.45}^{+ 3.62} \times 10^{32}$ $2.04_{-1.45}^{+3.62} \times 10^{32}$
OGLE-GD-RRLYR-07862	RRab	7.33	7.69	7.63	$2823_{- 751}^{+ 1417}$ $2823_{-751}^{+1417}$	(5.26 ± 2.36)×10⁻¹⁴	$5 . 02_{- 3.53}^{+ 11.4} \times 10^{31}$ $5.02_{-3.53}^{+11.4}\times 10^{31}$
OGLE-BLG-RRLYR-05650	RRc	3.56	7.46	7.41	$7188_{- 2227}^{+ 2717}$ $7188_{-2227}^{+2717}$	(6.70 ± 2.96)×10⁻¹⁴	$4 . 14_{- 3.04}^{+ 7.20} \times 10^{32}$ $4.14_{-3.04}^{+7.20} \times 10^{32}$
OGLE-BLG-RRLYR-41100	RRab	2.90	5.71	6.30	$6738_{- 1210}^{+ 2199}$ $6738_{-1210}^{+2199}$	(3.83 ± 2.03)×10⁻¹⁴	$2 . 08_{- 1.42}^{+ 3.52} \times 10^{32}$ $2.08_{-1.42}^{+3.52} \times 10^{32}$
V3732 Sgr	RRab	2.24	5.09	5.95	$7825_{- 1297}^{+ 2015}$ $7825_{-1297}^{+2015}$	(5.20 ± 2.87)×10⁻¹⁴	$3 . 81_{- 2.62}^{+ 5.54} \times 10^{32}$ $3.81_{-2.62}^{+5.54} \times 10^{32}$
OGLE-BLG-RRLYR-20811	RRab	6.00	6.52	5.34	$3662_{- 1708}^{+ 3082}$ $3662_{-1708}^{+3082}$	(4.21 ± 2.38)×10⁻¹⁴	$6 . 76_{- 5.92}^{+ 2.91} \times 10^{31}$ $6.76_{-5.92}^{+2.91} \times 10^{31}$

Notes. Sep – separation between the star and X-ray source on the sky, posErr – uncertainty of the X-ray source position, σ_DET – detection likelihood in 0.2–2.3 keV band.

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