Stars of spectral type Oe are very rare. To date, only 13 Oe stars have been identified within our Galaxy. In this paper, we present six new Oe stars and four new B0e stars found in LAMOST DR5. Repeated spectral observations of the same Oe stars show some emission line variability. The Hβ emission of TYC 4801-17-1 shows rapid V/R variation. Phase lags in the V/R ratio of TYC 4801-17-1 spectra are also seen. We found the unusual O4.5 star RL 128 is an Oe star with variable Hα intensity and its Ca II triplet emission appears when Hα emission reaches maximum intensity. These newly identified early type Oe and B0e stars significantly increase the known sample.
@article{arxiv.1807.00574,
title = {New Oe stars in LAMOST DR5},
author = {Guang-Wei Li and Jian-Rong Shi and Brian Yanny and Zhong-Rui Bai and Si-Cheng Yu and Yi-qiao Dong and Ya-Juan Lei and Hai-Long Yuan and Wei Zhang and Yong-Heng Zhao},
journal= {arXiv preprint arXiv:1807.00574},
year = {2018}
}