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Universe
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Stellar Multi-Band Observational Studies in the Era of Big Data
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Stellar Multi-Band Observational Studies in the Era of Big Data

A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Solar and Stellar Physics".

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 5815

Special Issue Editor

Prof. Dr. Liyun Zhang

E-Mail Website
Guest Editor
Guizhou Provincial Key Laboratory of Public Big Data, College of Physics, Guizhou University, Guiyang 550025, China
Interests: stellar physics; exoplanet system; big data; pulsar

Special Issue Information

Dear Colleagues,

Astronomy has entered the era of big data with all band observations. It is one of the most important astronomical topics related to the statistical analysis concerning stellar physics using big data from multi-band sky surveys. To date, we can determine stellar parameters and the intensity of different wavelengths. It is necessary to fully understand stellar physical properties, structure, and other special physical process phenomena, such as magnetic activity. Using the Gaia survey, we can also obtain the stellar distance and determine the spatial and magnetic activity distributions of different types of variable stars in the Milky Way. For example, we can obtain stellar spectroscopic parameters (such as the temperature, spectral type, radial velocity, log, and chemical abundance), and determine the properties and behavior of spectral lines using the SDSS and LAMOST time-series of low- and medium-resolution spectroscopic surveys, which have produced over ten million stellar large-sample data. We can also determine stellar orbital periods and calculate the parameters of starspot and flare events using Kepler and TESS photometric surveys. Moreover, we can explore the relationship between the intensities of stellar activity and stellar physical parameters (such as the orbital period and temperature) for variable stars. Finally, we can reveal the radiation of all wavelengths of the different variable stars in the Hertzsprung–Russell diagram. We also intend to present the relationships among the intensities of multi-bands from the optical spectral survey of the Guoshoujing telescope, VLA FIRST radio survey, the data of the 500 meter spherical radio telescope (FAST) and SKA, X-ray band and UV wavelengths. This project can not only more accurately determine the relationships of the different wavelengths, but can also reveal the laws between stellar physical parameters and activities in more detail.

Prof. Dr. Liyun Zhang
Guest Editor

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Keywords

  • variable star
  • eclipsing binary
  • photospheric starspot
  • chromospheric activity
  • corona
  • flare
  • radio
  • X-ray
  • big data
  • statistic

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Published Papers (3 papers)

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Research

10 pages, 496 KiB  
Article
Single Pulse Studies of PSR B0950+08 with FAST
by Heng Yang, Shijun Dang, Qijun Zhi, Lunhua Shang, Xin Xu, Dandan Zhang, Shuo Xiao, Rushuang Zhao, Aijun Dong, Hui Liu, Ziyi You, Qingying Li, Yuanyi Qin, Yanqing Cai and Wei Li
Universe 2023, 9(1), 50; https://doi.org/10.3390/universe9010050 - 12 Jan 2023
Cited by 1 | Viewed by 1957
Abstract
We report detailed polarization and single-pulse studies of PSR B0950+08 with the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) at 1250 MHz. Significant bridge emission was observed between the inter-pulse and the main pulse and the height of the bridge decreased with increase in [...] Read more.
We report detailed polarization and single-pulse studies of PSR B0950+08 with the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) at 1250 MHz. Significant bridge emission was observed between the inter-pulse and the main pulse and the height of the bridge decreased with increase in frequency. Our results support the interpretation that both the inter-pulse and the main pulse of this pulsar are from the same magnetic pole. From the relative peak flux density and the relative energy distribution, we conclude that no giant pulse was detected in PSR B0950+08. Our results provide opportunities to study the origin of the emission from PSR B0950+08 and offer new insights into the origins of pulsar emission and bridge emission. Full article
(This article belongs to the Special Issue Stellar Multi-Band Observational Studies in the Era of Big Data)
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18 pages, 3020 KiB  
Article
Physical Properties of Three Eclipsing Binaries of V Crt, WY Cnc and CG Cyg with Radio Radiation
by Yao Cheng, Liyun Zhang, Qingfeng Pi, Zhongzhong Zhu, Xianming L. Han, Prabhakar Misra, Zilu Yang, Baoda Li and Linyan Jiang
Universe 2022, 8(11), 551; https://doi.org/10.3390/universe8110551 - 24 Oct 2022
Viewed by 1470
Abstract
Radio radiation has been detected across the Hertzsprung Russell diagram. We selected three objects with radio radiation (a semi-detached eclipsing binary V Crt, and two detached binaries WY Cnc and CG Cyg) that show magnetic activity. We made new photometric observations using a [...] Read more.
Radio radiation has been detected across the Hertzsprung Russell diagram. We selected three objects with radio radiation (a semi-detached eclipsing binary V Crt, and two detached binaries WY Cnc and CG Cyg) that show magnetic activity. We made new photometric observations using a SARA 60 cm and NAOC 85 cm optical telescopes. Then, we obtained their orbital and starspot parameters by analyzing our light curves and published radial velocities using the updated Wilson-Devinney program. We revised the ephemeris information for V Crt and WY Cnc by analyzing the orbital minimum times. The orbital periods increased by 2.8 (±2.1) ×10−9 d yr−1 for V Crt, which maybe caused by mass transfer. The orbital periods decreased by −8.641 (±0.004) ×10−8 d yr−1 for WY Cnc. Orbital period change for CG Cyg was also found and we used a third-body of M3 of 0.14 M⊙ and a period of approximately 59.20 (0.36) yr to explain that. We also analysed the possible second period oscillation of CG Cyg with a cycle about 18.31 (0.06) yr. The long period changes of WY Cnc and CG Cyg might be caused by magnetic activity or stellar wind, rather than mass transfer. Full article
(This article belongs to the Special Issue Stellar Multi-Band Observational Studies in the Era of Big Data)
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18 pages, 2374 KiB  
Article
Physical Properties of Radio Stars Based on LAMOST Spectral Survey
by Liyun Zhang, Yao Cheng, Xianming L. Han, Qingfeng Pi, Prabhakar Misra, Baoda Li and Zhongzhong Zhu
Universe 2022, 8(7), 384; https://doi.org/10.3390/universe8070384 - 19 Jul 2022
Cited by 2 | Viewed by 1593
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 [...] Read more.
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 Hα emission. There are a total of 108 objects with repeated low resolution spectral observations, of which 63 show variations in the Hα 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 (EWs) of the Hα line. Among them, 93 radio stars with Hα 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. Full article
(This article belongs to the Special Issue Stellar Multi-Band Observational Studies in the Era of Big Data)
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