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- Title
Physical Properties of Radio Stars Based on LAMOST Spectral Survey.
- Authors
Zhang, Liyun; Cheng, Yao; Han, Xianming L.; Pi, Qingfeng; Misra, Prabhakar; Li, Baoda; Zhu, Zhongzhong
- Abstract
Radio emission has been detected for all types of stars in the Hertzsprung Russell diagram. Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low and medium-resolution spectroscopic surveys provide a good opportunity to obtain the spectroscopic properties of radio stars. We cross-matched big data from the LAMOST DR7 low resolution spectral survey with a catalogue of radio stars, and obtained 449 stellar spectra of 258 stars. We detected 185 spectra with H α emission. There are a total of 108 objects with repeated low resolution spectral observations, of which 63 show variations in the H α line over a long time, about several months. We cross-matched LAMOST DR7 medium resolution spectra with the radio star catalogue. We obtained 1319 LAMOST medium-resolution spectra of the 156 radio stars and then calculated their equivalent widths ( E W s ) of the H α line. Among them, 93 radio stars with H α emission were found from the LAMOST medium resolution spectra, and 63 objects showed short and long-term variabilities, especially on a short time scale of approximately 20 min. Finally, we estimated the minimal detectable radio flux of the FAST telescope and provided a scientific plan for studying radio stars.
- Subjects
RADIO sources (Astronomy); HR diagrams; STELLAR activity; BIG data
- Publication
Universe (2218-1997), 2022, Vol 8, Issue 7, pN.PAG
- ISSN
2218-1997
- Publication type
Article
- DOI
10.3390/universe8070384