DA WHITE DWARFS OBSERVED IN THE LAMOST PILOT SURVEY
Abstract
A total of {approx}640, 000 objects from the LAMOST pilot survey have been publicly released. In this work, we present a catalog of DA white dwarfs (DAWDs) from the entire pilot survey. We outline a new algorithm for the selection of white dwarfs (WDs) by fitting Sersic profiles to the Balmer H{beta}, H{gamma}, and H{delta} lines of the spectra, and calculating the equivalent width of the Ca II K line. Two thousand nine hundred sixty-four candidates are selected by constraining the fitting parameters and the equivalent width of the Ca II K line. All the spectra of candidates are visually inspected. We identify 230 DAWDs (59 of which are already included in the Villanova and SDSS WD catalogs), 20 of which are DAWDs with non-degenerate companions. In addition, 128 candidates are classified as DAWDs/subdwarfs, which means the classifications are ambiguous. The result is consistent with the expected DAWD number estimated based on the LEGUE target selection algorithm.
- Authors:
-
- Key Lab for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
- Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY (United States)
- Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180 (United States)
- University of Science and Technology of China, Hefei 230026 (China)
- Publication Date:
- OSTI Identifier:
- 22122890
- Resource Type:
- Journal Article
- Journal Name:
- Astronomical Journal (New York, N.Y. Online)
- Additional Journal Information:
- Journal Volume: 146; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALGORITHMS; CLASSIFICATION; SPECTRA; WHITE DWARF STARS
Citation Formats
Yueyang, Zhang, Licai, Deng, Chao, Liu, Carrell, Kenneth, Fan, Yang, Shuang, Gao, Yan, Xu, Jing, Li, Haotong, Zhang, Yongheng, Zhao, Ali, Luo, Zhongrui, Bai, Hailong, Yuan, Lepine, Sebastien, Newberg, Heidi Jo, Carlin, Jeffrey L., and Ge, Jin. DA WHITE DWARFS OBSERVED IN THE LAMOST PILOT SURVEY. United States: N. p., 2013.
Web. doi:10.1088/0004-6256/146/2/34.
Yueyang, Zhang, Licai, Deng, Chao, Liu, Carrell, Kenneth, Fan, Yang, Shuang, Gao, Yan, Xu, Jing, Li, Haotong, Zhang, Yongheng, Zhao, Ali, Luo, Zhongrui, Bai, Hailong, Yuan, Lepine, Sebastien, Newberg, Heidi Jo, Carlin, Jeffrey L., & Ge, Jin. DA WHITE DWARFS OBSERVED IN THE LAMOST PILOT SURVEY. United States. https://doi.org/10.1088/0004-6256/146/2/34
Yueyang, Zhang, Licai, Deng, Chao, Liu, Carrell, Kenneth, Fan, Yang, Shuang, Gao, Yan, Xu, Jing, Li, Haotong, Zhang, Yongheng, Zhao, Ali, Luo, Zhongrui, Bai, Hailong, Yuan, Lepine, Sebastien, Newberg, Heidi Jo, Carlin, Jeffrey L., and Ge, Jin. 2013.
"DA WHITE DWARFS OBSERVED IN THE LAMOST PILOT SURVEY". United States. https://doi.org/10.1088/0004-6256/146/2/34.
@article{osti_22122890,
title = {DA WHITE DWARFS OBSERVED IN THE LAMOST PILOT SURVEY},
author = {Yueyang, Zhang and Licai, Deng and Chao, Liu and Carrell, Kenneth and Fan, Yang and Shuang, Gao and Yan, Xu and Jing, Li and Haotong, Zhang and Yongheng, Zhao and Ali, Luo and Zhongrui, Bai and Hailong, Yuan and Lepine, Sebastien and Newberg, Heidi Jo and Carlin, Jeffrey L. and Ge, Jin},
abstractNote = {A total of {approx}640, 000 objects from the LAMOST pilot survey have been publicly released. In this work, we present a catalog of DA white dwarfs (DAWDs) from the entire pilot survey. We outline a new algorithm for the selection of white dwarfs (WDs) by fitting Sersic profiles to the Balmer H{beta}, H{gamma}, and H{delta} lines of the spectra, and calculating the equivalent width of the Ca II K line. Two thousand nine hundred sixty-four candidates are selected by constraining the fitting parameters and the equivalent width of the Ca II K line. All the spectra of candidates are visually inspected. We identify 230 DAWDs (59 of which are already included in the Villanova and SDSS WD catalogs), 20 of which are DAWDs with non-degenerate companions. In addition, 128 candidates are classified as DAWDs/subdwarfs, which means the classifications are ambiguous. The result is consistent with the expected DAWD number estimated based on the LEGUE target selection algorithm.},
doi = {10.1088/0004-6256/146/2/34},
url = {https://www.osti.gov/biblio/22122890},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 2,
volume = 146,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 2013},
month = {Thu Aug 01 00:00:00 EDT 2013}
}