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Title: Study of eclipsing binary and multiple systems in ob associations. II. The cygnus ob region: V443 Cyg, V456 Cyg, and V2107 Cyg

Three presumably young eclipsing binary systems in the direction of the Cygnus OB1, OB3, and OB9 associations are studied. Component spectra are reconstructed and their orbits are determined using light curves and spectra disentangling techniques. V443 Cyg and V456 Cyg have circular orbits while the light curve of V2107 Cyg imposes a slightly eccentric orbit (e = 0.045 ± 0.03). V443 Cyg harbors F-type stars, not young early-A stars as previously suggested in the literature based solely on photometry. It appears to be situated in the foreground (distance 0.6 ± 0.2 kpc) of the young stellar populations in Cygnus. V456 Cyg, at a distance of 0.50 ± 0.03 kpc, consists of a slightly metal-weak A-type star and an early-F star. The age of both systems, on or very near to the main sequence, remains uncertain by an order of magnitude. V2107 Cyg is a more massive system (8.9 ± 2 and 4.5 ± 1.2 M {sub ☉}) at 1.5 ± 0.5 kpc and, also kinematically, a strong candidate-member of Cyg OB1. The more massive component is slightly evolved and appears to undergo non-radial βCep-type pulsations. The Doppler signal of the secondary is barely detectable. A more extensive, asteroseismological study ismore » necessary to fix masses more precisely. Nevertheless, the position of the primary in the H-R diagram confines the age reasonably well to 20 ± 5 Myr, indicating that for Cyg OB1 has a similar extent of star formation history as that established for Cyg OB2.« less
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ;  [7]
  1. Faculty of Science, Department of Space Sciences and Technologies, Akdeniz University, Antalya (Turkey)
  2. Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels (Belgium)
  3. Science Faculty, Department of Astronomy and Space Sciences, İstanbul University, 34119 University-İstanbul (Turkey)
  4. Physics Department, Çanakkale Onsekiz Mart University, Terzioǧlu Campus, TR-17020 Çanakkale (Turkey)
  5. Faculty of Science, Department of Astronomy and Space Sciences, Ege University, İzmir (Turkey)
  6. Department of Space Sciences and Technologies, Çanakkale Onsekiz Mart University, Terzioǧlu Campus, TR-17020 Çanakkale (Turkey)
  7. Department of Theoretical Physics and Astrophysics, Masaryk University, Brno (Czech Republic)
Publication Date:
OSTI Identifier:
22340227
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 147; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; DISTANCE; ECLIPSE; MASS; METALS; ORBITS; PHOTOMETRY; SPECTRA; VISIBLE RADIATION