双星与变星研究组知识库

We present the first multicolor photometric observations of the short period low-mass eclipsing binary SDSS 3012119.10-001949.9. By using the 2013 version of the Wilson-Devinney code, the photometric solutions are derived. It is found that the system is in a contact configuration (f =- 18.9 +/- 6.0%) with a moderate mass ratio of 0.5 +/- 0.01. A third light contributing about 6.1 +/- 1.3% of the total luminosity in the V band was found, which may come from a cool tertiary component. The derived high orbital inclination (i = 83.9 degrees +/- 0.5 degrees) and the almost symmetric three light curves suggest that the determined parameters are reliable. Both the color class and spectral class of the system correspond to a spectral type of MO, which may indicate that SDSS J012119.10-001949.9 belongs to a very rare class of M dwarf contact binaries that are below the theoretical short period limit.