Haotong Zhang, A-Li Luo, Heidi Jo Newberg, Shuang Gao, Hailong Yuan, Kenneth Carrell, Jeffrey L. Carlin, Ge Jin, Zhong-Rui Bai, Yue-Yang Zhang, Licai Deng, Chao Liu, Yong-Heng Zhao, Fan Yang, Jing Li, Yan Xu, and Sébastien Lépine
A total of $\sim640,000$ objects from LAMOST pilot survey have been publicly released. In this work, we present a catalog of DA white dwarfs from the entire pilot survey. We outline a new algorithm for the selection of white dwarfs by fitting S\'ersic profiles to the Balmer H$\beta$, H$\gamma$ and H$\delta$ lines of the spectra, and calculating the equivalent width of the CaII K line. 2964 candidates are selected by constraining the fitting parameters and the equivalent width of CaII K line. All the spectra of candidates are visually inspected. We identify 230 (59 of them are already in Villanova and SDSS WD catalog) DA white dwarfs, 20 of which are DA white dwarfs with non-degenerate companions. In addition, 128 candidates are classified as DA white dwarf/subdwarfs, which means the classifications are ambiguous. The result is consistent with the expected DA white dwarf number estimated based on the LEGUE target selection algorithm., Comment: 44 pages, 18 figures