Double- and Triple-line Spectroscopic Candidates in the LAMOST Medium-Resolution Spectroscopic Survey

• Published in: The Astrophysical journal. Supplement series Vol. 256; no. 2; pp. 31 - 42
• Main Authors: Li, Chun-qian, Shi, Jian-rong, Yan, Hong-liang, Fu, Jian-Ning, Li, Jia-dong, Hou, Yong-Hui
• Format: Journal Article
• Language: English
• Published: Saskatoon The American Astronomical Society 01.10.2021; IOP Publishing
• Subjects: Correlation; Cross correlation; Monte Carlo simulation; Polls & surveys; Radial velocity; Spectroscopic binary stars; Spectroscopy
• ISSN: 0067-0049; 1538-4365
• DOI: 10.3847/1538-4365/ac22a8

Abstract The LAMOST Medium-Resolution Spectroscopic Survey (LAMOST-MRS) provides an unprecedented opportunity for detecting multiline spectroscopic systems. Based on the cross correlation function and successive derivatives, we search for spectroscopic binaries and triples and derive their radial velocities (RVs) from the LAMOST-MRS spectra. A Monte Carlo simulation is adopted to estimate the RV uncertainties. After examining over 1.3 million LAMOST DR7 MRS blue-arm spectra, we obtain 3133 spectroscopic binary (SB) and 132 spectroscopic triple (ST) candidates, which account for 1.2% of the LAMOST-MRS stars. Over 95% of the candidates are newly discovered. It is found that all of the ST candidates are on the main sequence, while around 10% of the SB candidates may have one or two components on the red giant branch.