Binary systems are ideal for accurately determining basic physical parameters, such as the mass, radius, and luminosity of stars. Variable stars are particularly important, as they provide means of revealing stellar internal structure.
studies binary systems Using the star δScuti can lead to accurate derivation of the underlying stellar physical parameters, and provides additional constraints to stellar physiognomy investigations of pulsars.
Recently, researchers led by Dr Feng Guoji of the Xinjiang Astronomical Observatory (XAO) of the Chinese Academy of Sciences and their collaborators conducted time-domain spectral observations of KIC 10417986 using the 1.2-m Nanshan Optical Telescope and the 2.16-m Xinglong Telescope.
They obtained the orbital and stellar parameters of the binary system for the first time. They also extracted and determined the pulse frequencies and their patterns by analyzing light curves from Kepler.
The study has been published in Research in astronomy and astrophysics.
The researchers showed that KIC 10417986 is a single-line spectral binary star, and derived its orbital parameters. The orbital period is about 0.84495 days, which differs from the possible orbital period of 0.0737 days obtained from the Kepler light curves. orbital It provides strong confirmation to correctly identify the pulse frequencies,” said Dr. Feng.
Using the technique of fitting synthetic spectra, they determined the initial parameters of the atmosphere, such as effective temperatureAnd the surface gravitymetal and rotational speed. From the monoclinic nature and mass function of the star, the derived orbital inclination was 26 ± 6°, and the secondary phase mass was about 0.52 M⊙, indicating that it must be a late K to early M star.
In addition, fourteen frequencies were extracted from the Kepler light curves. Among them, six independent frequencies in the high frequency region have been identified as p-mode pulses of Scuti star, and one independent frequency in the low frequency region. The latter is likely to be the rotational frequency due to the star points, indicating magnetic activity and differential surface rotation of the core component.
Guo-Jie Feng et al, KIC 10417986: Spectral confirmation of the nature of a binary system with a δ Scuti component, Research in astronomy and astrophysics (2022). DOI: 10.1088/1674-4527/ac8b5c
Chinese Academy of Sciences
the quote: Study reveals nature of single-line spectral binary star KIC 10417986 (2022, November 25), retrieved November 25, 2022 from https://phys.org/news/2022-11-reveals-nature-single-line-spectroscopic -binary. programming language
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