Properties of Radial Velocities measurement based on LAMOST-II Medium-Resolution Spectroscopic Observations
| Autor: | Wang, R., Luo, A. -L., Chen, J. -J., Bai, Z. -R., Chen, L., Chen, X. -F., Dong, S. -B., Du, B., Fu, J. -N., Han, Z. -W., Hou, J. -L., Hou, Y. -H., Hou, W., Jiang, D. -K., Kong, X., Li, L. -F., Liu, C., Liu, J. -M., Qin, L., Shi, J. -R., Tian, H., Wu, H., Wu, C. -J., Xie, J. -W., Zhang, H. -T., Zhang, S., Zhao, G., Zhao, Y. -H., Zhong, J., Zong, W. -K., Zuo, F. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | 2019ApJS..244...27W |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4365/ab3cc0 |
| Popis: | The radial velocity (RV) is a basic physical quantity which can be determined through Doppler shift of the spectrum of a star. The precision of RV measurement depends on the resolution of the spectrum we used and the accuracy of wavelength calibration. In this work, radial velocities of LAMOST-II medium resolution (R ~ 7500) spectra are measured for 1,594,956 spectra (each spectrum has two wavebands) through matching with templates. A set of RV standard stars are used to recalibrate the zero point of the measurement, and some reference sets with RVs derived from medium/high-resolution observations are used to evaluate the accuracy of the measurement. Comparing with reference sets, the accuracy of our measurement can get 0.0227 km s/1 with respect to radial velocities standard stars. The intrinsic precision is estimated with the multiple observations of single stars, which can achieve to 1.36 km s/1,1.08 km s/1, 0.91 km s/1 for the spectra at signal-to-noise levels of 10, 20, 50, respectively. Comment: published by ApJs. 13 pages, 13 figures |
| Databáze: | arXiv |
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