Swift X-ray and UV observations of six Gaia binaries supposedly containing a neutron star

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Volume 686 (June 2024)

A&A, 686 (2024) A299

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Table 1.

Source properties.

Source Name	DR3 Gaia ID	Distance	Period ⁽¹⁾	Eccentricity	m₁ ⁽²⁾	Type ⁽³⁾	G	m₂ ⁽⁴⁾
		(pc)	(d)		(M_⊙)		(mag)	(M_⊙)
0616+2319	3425175331243738240	1111 ± 30	0.866605 ± 1.0 × 10⁻⁶	0.0007 $_{- 0.0005}^{+ 0.007}$ $^{+0.007}_{-0.0005}$	1.7 ± 0.1	G7	13.21	1.1–1.3
1220+5841	1581117310088807552	219 ± 3	927 ± 11	0.52 ± 0.01	0.70 ± 0.2	K5	14.51	1.43 $_{- 0.17}^{+ 0.16}$ $^{+0.16}_{-0.17}$
1313+4152	1525829295599805184	248 ± 7	328 ± 2	0.37 ± 0.04	0.69 ± 0.2	K7	16.18	1.44 $_{- 0.20}^{+ 0.19}$ $^{+0.19}_{-0.20}$
1527+3536	1375051479376039040	118 ± 0.9	0.2556698 ± 2 × 10⁻⁷	0.0 ⁽⁵⁾	0.62 ± 0.01	K9-M0	13.05	0.98 ± 0.03
1832–0119	4271998639836225920	181 ± 2	545 ± 2	0.44 ± 0.05	0.63–1.00	M2	15.62	1.44 ± 0.17
2128+3316	1854241667792418304	227 ± 2	1430 ± 66	0.59 ± 0.02	0.70 ± 0.2	K5	14.87	1.62 $_{- 0.18}^{+ 0.17}$ $^{+0.17}_{-0.18}$

Notes. ⁽¹⁾The periods of 0616+2319 and 1527+3536 were obtained from the dedicated works of Yuan et al. (2022) and Lin et al. (2023), respectively. All other periods are from Andrews et al. (2022). ⁽²⁾Mass of the main sequence star. ⁽³⁾Spectral type of the main sequence star, from Yuan et al. (2022), Andrews et al. (2022), Lin et al. (2023), Gaia Collaboration (2023). ⁽⁴⁾Mass of the unseen companion. ⁽⁵⁾Lin et al. (2023) used a circular Keplerian model for the orbital parameters fit.

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