Chien-De Lee (IANCU); Wen-Ping Chen (IANCU); Eswaraiah Chakali (NTHU); Chow-Choong Ngeow (IANCU); Po-Chieh Yu (IANCU); Chih-Hao Hsia (MUST); Chien-Cheng Lin (MPIA)
HD 45677 and HD 50138 are two B[e] stars with the in situ dust in the disk. Our measurements of the intrinsic polarization reveal a decreasing level of polarization with wavelength and a wavelength-independent feature in the polarization angle. Moreover, we also reanalyze the polarimetric data from the literature. Combining the data from all the available epochs led us to conclude that a general electron scattering-dominated disk exists in both B[e] stars, with evidence of micron-sized grains seen at some epochs, likely condensed in the inner disk. In addition to studying the individual B[e] stars, most of the early-type emission-line stars are also photometric variables. Therefore, we are moving forward to the photometric survey, because here comes Zwicky Transient Facility (ZTF). With ZTF large field of view (47 square degree), the northern sky can be surveyed with high cadence on Galactic Plane. ZTF makes systematic census possible for the photometric variability of Be stars in the deep sky. Here, we present the preliminary light curves of Be stars from the ZTF commissioning observations together with other transit surveys.