Close eclipsing binary BD And: a triple system
| Autor: | R. Komžík, Ľ. Hambálek, Eike W. Guenther, Martin Vaňko, T. Pribulla, J. Nedoroščík, Emil Kundra, V. Perdelwitz |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Astrophysics - Solar and Stellar Astrophysics Triple system FOS: Physical sciences Binary number Astrophysics::Solar and Stellar Astrophysics Astronomy and Astrophysics Astrophysics Astrophysics::Earth and Planetary Astrophysics Methods observational Solar and Stellar Astrophysics (astro-ph.SR) |
| Popis: | BD And is a fairly bright (V = 10.8), active and close (P = 0.9258 days) eclipsing binary. The cyclic variability of the apparent orbital period as well as third light in the light curves indicate the presence of an additional late-type component. The principal aim is the spectroscopic testing of the third-body hypothesis and determination of absolute stellar parameters for both components of the eclipsing binary. First medium and high-resolution spectroscopy of the system was obtained. The broadening-function technique appropriate for heavily-broadened spectra of close binaries was used. The radial velocities were determined fitting the Gaussian functions and rotational profiles to the broadening functions. A limited amount of photometric data has also been obtained. Although the photometric observations were focused on the obtaining the timing information, a cursory light-curve analysis was also performed. Extracted broadening functions clearly show the presence of a third, slowly-rotating component. Its radial velocity is within error of the systemic velocity of the eclipsing pair, strongly supporting the physical bond. The observed systemic radial-velocity and third-component changes do not support the 9 year orbit found from the timing variability. Masses of the components of the eclipsing pair are determined with about 0.5% precision. Further characterization of the system would require long-term photometric and spectroscopic monitoring. 23 pages, 6 figures, online data table |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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