Discovery of a double white dwarf in the Galactic globular cluster NGC 6397

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Volume 707 (March 2026)

A&A, 707 (2026) A261

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Table 1

Properties of the binary system NF1 AB.

NF1 A (primary)
Stellar type	White dwarf
Min. mass	0.78 ± 0.06 M_⊙
NF1 B (secondary)
Stellar type	He-core white dwarf
T_eff	$16 140_{- 120}^{+ 170}$ $Mathematical equation: $16 140^{+170}_{-120}$$ K
log g	${5.72}_{- 0.03}^{+ 0.04}$ $Mathematical equation: $5.72^{+0.04}_{-0.03}$$ (cgs)
Radius	0.109 ± 0.005 R_⊙
Luminosity	0.74 ± 0.07 L_⊙
Mass	0.23 ± 0.03 M_⊙
Orbital parameters
Period p	0.54351 ± 0.00003 d
Semi-amplitude K	202 ± 6 km/s
Eccentricity e	<0.03
Systemic velocity γ	50.1 ± 4.1 km/s
Argument of periastron ω	${1.7}_{- 1.1}^{+ 2.5}$ $Mathematical equation: $1.7^{+2.5}_{-1.1}$$
t₀ (JD)	2460082.6941611907
Mean anomaly at t₀	${3.2}_{- 1.5}^{+ 1.2}$ $Mathematical equation: $3.2^{+1.2}_{-1.5}$$
Sampling statistics
Evidence log Z	−50.0 ± 0.2
KL divergence H	24.5 ± 0.1
Max. log L	−23

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