Eclipsing Binaries Observed by LAMOST
2019 February 01
LAMOST has a wide field of view and a very high spectrum acquiring rate. More than 9 millions spectra were obtained by LAMOST till now. Among them, more than 8 millions are stellar spectra. Such huge stellar spectra database will stimulate the deep study of stellar physics and corresponding fields. Eclipsing binaries are very important sources in astrophysics because they provide precise information about absolute parameters of the components. LAMOST observed 12923 eclipsing binary stars, which greatly expanded the spectroscopic information of eclipsing binaries. We provided the eclipsing binary catalogue with stellar atmospheric parameters and spectral types obtained by LAMOST. In this paper, we introduce the different kinds of eclipsing binaries observed by LAMOST. As an example of the follow-up observation, we present the study of the EW-type eclipsing binary NSVS4692753. Combined the complete light curves and the parameters obtained by LAMOST, we analyzed its muli-color light curves.Our results show that NSVS4692753 is a low mass ratio (mass ratio 5.0) and deep contact (fill-out factor 64\%) W-type contact binary system. The third light contribution was detected in all bands and the asymmetric light variation detected in the light curve was explained by the dark spot in the secondary. NSVS4692753 is the special system at the late evolutionary stage of contact binaries, and maybe the progenitor of the luminous red nova, which is a rare class of optical transients.