Constraints on accretion column parameters for the intermediate polar LS Pegasi from the power spectrum of its optical light curve
| Autor: | R. A. Burenin, M. N. Pavlinsky, I. M. Khamitov, Mikhail G. Revnivtsev, Andrey Semena, Tansel Ak, Zeki Eker |
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| Rok vydání: | 2013 |
| Předmět: |
Physics
Brightness Plasma parameters Astrophysics::High Energy Astrophysical Phenomena White dwarf Spectral density Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Light curve Accretion (astrophysics) law.invention Telescope Intermediate polar Space and Planetary Science law Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Astronomy Letters. 39:227-236 |
| ISSN: | 1562-6873 1063-7737 |
| DOI: | 10.1134/s1063773713040051 |
| Popis: | The properties of the hot zone in the accretion flow near the surface of a magnetized white dwarf have been studied. For this purpose, the aperiodic optical variability of LS Peg, one of the brightest intermediate polars in the northern sky, has been investigated. The main radiation of the hot zone, which is then reemitted in the optical band, results from the radiation of an optically thin plasma heated during the passage of the accretion flow of a standing shock. Recently, Semena and Revnivtsev (2012) have shown that the aperiodic variability (flickering) of accreting magnetized white dwarfs should have a characteristic feature in the range of Fourier frequencies corresponding to the plasma cooling time in this hot region. The photometric brightness measurements for LS Peg made with the RTT-150 telescope using a high-speed ANDOR iXon CCD array have allowed the break frequency in the power spectrum of the source’s variability to be constrained. Constraints on the geometry of the accretion column for the white dwarf in LS Peg and on the plasma parameters in it have been obtained. |
| Databáze: | OpenAIRE |
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