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Chemical composition of the atmosphere and evolutionary status of the spectroscopic and speckle-interferometric binary 12 Persei

Chemical composition of the atmosphere and evolutionary status of the spectroscopic and... The system 12 Per is a spectroscopic and speckle-interferometric binary with the components of similar spectral classes. The parameters of its orbit were determined quite accurately over nearly a century of observations. To refine the atmospheric abundances of its components and their evolutionary status, we obtained the spectra of the star in the 3500–9600 Å spectral region using the echelle spectrometers of the 6-m BTA telescope of the SAO RAS and 2-m Zeiss-2000 telescope at Terskol Peak. Based on the luminosities (L 1 = 3.02 L ⊙, L 2 = 1.86 L ⊙) and effective temperatures (T eff1 = 6195 K and T eff2 = 6000 K) we have estimated the evolutionary status of the system’s components. The age of the system is 12.1 Byr, the components are at the stage of hydrogen burning near the zero-age main sequence. The resulting element abundances in the atmospheres of 12 Per components indicate enhanced metallicity of both stars: [Fe/H] ≥ 0.35. We consider a scenario in which the initially circular short-period orbit of the pair turns into an eccentric large-period orbit due to the transfer of angular momentum of the components to the angular momentum of orbital motion over one billion years. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Astrophysical Bulletin Springer Journals

Chemical composition of the atmosphere and evolutionary status of the spectroscopic and speckle-interferometric binary 12 Persei

Astrophysical Bulletin , Volume 67 (3) – Aug 25, 2012

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References (3)

Publisher
Springer Journals
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Physics; Astronomy, Astrophysics and Cosmology
ISSN
1990-3413
eISSN
1990-3421
DOI
10.1134/S1990341312030042
Publisher site
See Article on Publisher Site

Abstract

The system 12 Per is a spectroscopic and speckle-interferometric binary with the components of similar spectral classes. The parameters of its orbit were determined quite accurately over nearly a century of observations. To refine the atmospheric abundances of its components and their evolutionary status, we obtained the spectra of the star in the 3500–9600 Å spectral region using the echelle spectrometers of the 6-m BTA telescope of the SAO RAS and 2-m Zeiss-2000 telescope at Terskol Peak. Based on the luminosities (L 1 = 3.02 L ⊙, L 2 = 1.86 L ⊙) and effective temperatures (T eff1 = 6195 K and T eff2 = 6000 K) we have estimated the evolutionary status of the system’s components. The age of the system is 12.1 Byr, the components are at the stage of hydrogen burning near the zero-age main sequence. The resulting element abundances in the atmospheres of 12 Per components indicate enhanced metallicity of both stars: [Fe/H] ≥ 0.35. We consider a scenario in which the initially circular short-period orbit of the pair turns into an eccentric large-period orbit due to the transfer of angular momentum of the components to the angular momentum of orbital motion over one billion years.

Journal

Astrophysical BulletinSpringer Journals

Published: Aug 25, 2012

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