Fourier analysis of spectra of solar-type stars
| 1Sheminova, VA 1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2017, 33(5):27-48 |
| https://doi.org/10.15407/kfnt2017.05.027 |
| Start Page: Physics of Stars and Interstellar Medium |
| Language: Russian |
Abstract: We used Fourier transform techniques to identify macroturbulent velocity. The analysis is done with mictoturbulent velocity and rotation velocity as an unknown quantities. To separate the effects of the star rotation from the macroturbulence effects in the slowly rotating stars, we analyzed mostly the main lobe of the residual Fourier transform of the observed lines. This is most complete case in the Fourier analysis of spectral lines. It has been tested with many lines of the solar spectrum and two stars. Our results satisfactory coincide with the results of other methods. The microturbulent, macroturbulent, rotation velocities results: Sun as the star, 0.85, 2.22, 1.75; HD 10700, 0.58, 1.73, 0.78; HD 1835, 1.16, 3.56, 6.24 km/sec, respectively. Derived macroturbulent velocity decreases with the height in the atmosphere of the Sun and the HD 1835 star. For the HD 10700 star the macroturbulent velocity does not change with the height and their rotation velocity is almost two times less than the one obtained by other methods previously. It is concluded that Fourier transform techniques can be applied to determine the velocities in the atmospheres of solar-type stars with very slow rotation. |
| Keywords: Fourier analysis, macroturbulent velocity, solar-type stars, spectral lines |
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