Fundamental parameters of the massive eclipsing binary HM1 8

We present a comprehensive study of the massive binary system HM1~8, based on multi-epoch high resolution spectroscopy, $V$-band photometry and archival X-ray data. Spectra from OWN Survey, optical monitoring Southern O WN stars, are used to analyse spectral morphology perform quantitative spectroscopic analysis both stellar components. The primary secondary components classified as O4.5~IV(f) O9.7~V, respectively. From radial-velocity (RV) we derived set orbital parameters for system. found an eccentric orbit ($e=0.14 \pm 0.01$) with period $P = 5.87820 0.00008$~days. Through simultaneous RVs light curve inclination $70.0^{\circ} 2.0$ masses $M_a=33.6^{+1.4}_{-1.2}~\text{M}_{\sun}$ primary, $M_b=17.7^{+0.5}_{-0.7}~\text{M}_{\sun}$ secondary. show projected rotational velocities $v_1\sin{i}=105 14~\text{km~s}^{-1}$ $v_2\sin{i}=82 15~\text{km~s}^{-1}$, A tidal evolution is also performed be in agreement characteristics. Finally, available observations no evidence colliding winds region, therefore emission attributed winds.