LAMOST Time-Domain Survey: First Results of four $K$2 plates
| Autor: | Song Wang, Hao-Tong Zhang, Zhong-Rui Bai, Hai-Long Yuan, Mao-Sheng Xiang, Bo Zhang, Wen Hou, Fang Zuo, Bing Du, Tan-Da Li, Fan Yang, Kai-Ming Cui, Yi-Lun Wang, Jiao Li, Mikhail Kovalev, Chun-Qian Li, Hao Tian, Wei-Kai Zong, Heng-Geng Han, Chao Liu, A-Li Luo, Jian-Rong Shi, Jian-Ning Fu, Shao-Lan Bi, Zhan-Wen Han, Ji-Feng Liu |
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| Rok vydání: | 2021 |
| Předmět: |
010308 nuclear & particles physics
FOS: Physical sciences Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Astrophysics - Instrumentation and Methods for Astrophysics 010303 astronomy & astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | Wang, S, Zhang, H T, Bai, Z R, Yuan, H L, Xiang, M S, Zhang, B, Hou, W, Zuo, F, Du, B, Li, T D, Yang, F, Cui, K M, Wang, Y L, Li, J, Kovalev, M, Li, C Q, Tian, H, Zong, W K, Han, H G, Liu, C, Luo, A L, Shi, J R, Fu, J N, Bi, S L, Han, Z W & Liu, J F 2021, ' LAMOST Time-Domain survey : first results of four K2 plates ', Research in Astronomy and Astrophysics, vol. 21, no. 11, 292 . https://doi.org/10.1088/1674-4527/21/11/292 |
| DOI: | 10.48550/arxiv.2109.03149 |
| Popis: | From Oct. 2019 to Apr. 2020, LAMOST performs a time-domain spectroscopic survey of four $K$2 plates with both low- and med-resolution observations. The low-resolution spectroscopic survey gains 282 exposures ($\approx$46.6 hours) over 25 nights, yielding a total of about 767,000 spectra, and the med-resolution survey takes 177 exposures ($\approx$49.1 hours) over 27 nights, collecting about 478,000 spectra. More than 70%/50% of low-resolution/med-resolution spectra have signal-to-noise ratio higher than 10. We determine stellar parameters (e.g., $T_{\rm eff}$, log$g$, [Fe/H]) and radial velocity (RV) with different methods, including LASP, DD-Payne, and SLAM. In general, these parameter estimations from different methods show good agreement, and the stellar parameter values are consistent with those of APOGEE. We use the $Gaia$ DR2 RV data to calculate a median RV zero point (RVZP) for each spectrograph exposure by exposure, and the RVZP-corrected RVs agree well with the APOGEE data. The stellar evolutionary and spectroscopic masses are estimated based on the stellar parameters, multi-band magnitudes, distances and extinction values. Finally, we construct a binary catalog including about 2700 candidates by analyzing their light curves, fitting the RV data, calculating the binarity parameters from med-resolution spectra, and cross-matching the spatially resolved binary catalog from $Gaia$ EDR3. The LAMOST TD survey is expected to get breakthrough in various scientific topics, such as binary system, stellar activity, and stellar pulsation, etc. Comment: 22 pages, 19 figures, 7 tables. Accepted for publication in RAA |
| Databáze: | OpenAIRE |
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