Resolving the dynamical mass tension of the massive binary 9 Sagittarii

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Table 1.

Relative astrometric solution of 9 Sgr, where the usual notation of the orbital elements have been adopted (see Appendix B).

Element [Unit]	Value	Error
P [d]	3261	69
T₀ [MJD]	56547	12
Ω [deg]	67.3	0.4
ω [deg] ^(a)	210.7	2.3
i [deg]	86.5	0.5
e	0.648	0.009

Notes. The reported errors correspond to the 1σ confidence interval determined by the MCMC analysis.

^(a)

By construction, the periastron argument of the relative orbit ω is shifted by 180° compared to the argument of periastron ω₁ that is traditionally adopted by fitting the RV curve of the primary star.

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