Atmospheric chemical abundances and the evolutionary status of the spectroscopic and speckle-interferometric binary 9 Cyg
| Autor: | M. K. Kuznetsov, V. V. Leushin, Yu. Yu. Balega, Vakhtang S. Tamazian |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
Red giant Astrophysics::High Energy Astrophysical Phenomena Solar luminosity Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Orbital period law.invention Telescope Atmosphere Space and Planetary Science law Observatory Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Speckle imaging Spectroscopy Astrophysics::Galaxy Astrophysics |
| Zdroj: | Astronomy Reports. 52:226-236 |
| ISSN: | 1562-6881 1063-7729 |
| Popis: | We have performed speckle interferometry with the 6-m telescope of the Special Astrophysical Observatory and spectroscopy (at 3700–9200 A) with the 2-m telescope at Peak Terskol of the spectroscopic and interferometric binary 9 Cyg, which is a composite-spectrum star with an orbital period of 4.3 yrs. The atmosphere of the system’s primary component is analyzed in detail. The luminosities of both components estimated to be L 1 = 103.8 L ⊙, L 2 = 55.2 L ⊙, where L ⊙ is the solar luminosity, and their effective temperatures to be T e (1) = 5300 K and T e (2) = 9400 K. The abundances of C, N, O, Fe, and other elements in the primary’s atmosphere have been derived. The chemical composition shows signatures of mixing of material from its atmosphere and the region of nuclear reactions. The evolutionary status of 9 Cyg has been determined. The binary’s age is about 400 million years; the brighter star is already in the transition to becoming a red giant, while the secondary is still in the hydrogen-burning stage near the zero-age main sequence. We suggest an evolutionary model for the binary’s orbit that explains the high eccentricity, e = 0.79. |
| Databáze: | OpenAIRE |
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