Orbital parameters of the high-mass X-ray binary 4U 2206+54

Abstract

We present new radial velocities of the high-mass X-ray binary star 4U 2206+54 based on optical spectra obtained with the Coude spectrograph at the 2m RCC telescope at the Rozhen National Astronomical Observatory, Bulgaria in the period November 2011 -- July 2013. The radial velocity curve of the HeI $\lambda$6678 Å line is modeled with an orbital period P${}_{orb}$ = 9.568~d and an eccentricity of $e$ = 0.3. These new measurements of the radial velocity resolve the disagreements of the orbital period discussions.

arXiv comment4 pages, 4 figures. Accepted for publication in Astronomische Nachrichten

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• Determination of the Galactic Rotation Curve from OB Stars
• NuSTAR rules out a cyclotron line in the accreting magnetar candidate 4U2206+54
• The origin of the high-mass X-ray binary 4U 2206+54/BD +53 2790
• Finding the birthplace of HMXBs in the Galaxy using Gaia EDR3: kinematical age determination through orbit integration
• Further evidence for natal kick segregation by spectral type in high-mass X-ray binaries