A total of ∼640,000 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 Hβ, Hγ and Hδ 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.
@article{arxiv.1307.2021,
title = {DA white dwarfs observed in LAMOST pilot survey},
author = {Yue-Yang Zhang and Li-Cai Deng and Chao Liu and Sebastien Lépine and Heidi Jo Newberg and Jeffrey L. Carlin and Kenneth Carrell and Fan Yang and Shuang Gao and Yan Xu and Jing Li and Hao-Tong Zhang and Yong-Heng Zhao and A-Li Luo and Zhong-Rui Bai and Hai-Long Yuan and Ge Jin},
journal= {arXiv preprint arXiv:1307.2021},
year = {2015}
}