Journal
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume 19, Issue 5, Pages -Publisher
NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
DOI: 10.1088/1674-4527/19/5/75
Keywords
technique: spectroscopy; stars: radial velocity; stars: statistics
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Funding
- National Development and Reform Commission
- National Natural Science Foundation of China [11673003, 11833002]
- China Postdoctoral Science Foundation [2018M641244]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-SLH007]
- LAMOST fellowship - Special Funding for Advanced Users, budgeted and administrated by the Center for Astronomical Mega-Science, CAS
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Radial velocity is one of the key measurements in understanding the fundamental properties of stars, stellar clusters and the Galaxy. A plate of stars in the Kepler field was observed in May of 2018 with the medium-resolution spectrographs of LAMOST, aiming to test the performance of this new system which is the upgraded equipment of LAMOST after the first five-year regular survey. We present our analysis on the radial velocity measurements (RVs) derived from these data. The results show that slight and significant systematic errors exist among the RVs obtained from the spectra collected by different spectrographs and exposures, respectively. After correcting the systematic errors with different techniques, the precision of RVs reaches similar to 1.3, similar to 1.0, similar to 0.5 and similar to 0.3 km s(-1) at S/N-r = 10, 20, 50 and 100, respectively. Comparing with the RVs of standard stars from the APOGEE survey, our RVs are calibrated with a zero-point shift of similar to 7 km s(-1). The results indicate that the LAMOST medium-resolution spectroscopic system may provide RVs with a reasonable accuracy and precision for the selected targets.
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