TOWARD AN ACCURATE DETERMINATION OF PARAMETERS FOR VERY MASSIVE STARS: THE ECLIPSING BINARY LMC-SC1-105*

摘要: This paper presents a photometric and spectroscopic study of the bright blue eclipsing binary LMC-SC1-105, selected from Optical Gravitational Lensing Experiment catalog as candidate host very massive stars (≥30 M☉). The system is found to be double-lined binary, which indeed contains stars. masses radii components are M 1 = 30.9 ± 1.0 M☉, 2 13.0 0.7 R 15.1 0.2 R☉, 11.9 respectively. less star filling its Roche lobe, indicating has undergone mass transfer. spectra LMC-SC1-105 display Struve-Sahade effect, with He I lines secondary appearing stronger when it receding causing spectral types change phase (O8+O8 O7+O8.5). effect could related transfer in this system. To date, accurate (≤10%) fundamental parameters have only been measured for 15 greater than 30 ☉, reported measurements contributing valuable data on at low metallicity. results work demonstrate that strategy targeting brightest binaries an effective way studying