Study of Eclipsing Binary and Multiple Systems in OB Associations. II. The Cygnus OB Region: V443 Cyg, V456 Cyg, and V2107 Cyg

BAKIS, V., H. HENSBERGE, S. BILIR, H. BAKIS, F. YILMAZ, E. KITAN, O. DEMIRCAN, Miloslav ZEJDA and Zdeněk MIKULÁŠEK. Study of Eclipsing Binary and Multiple Systems in OB Associations. II. The Cygnus OB Region: V443 Cyg, V456 Cyg, and V2107 Cyg. The Astronomical Journal. IOP PUBLISHING LTD, 2014, vol. 147, No 6, p. 149-161. ISSN 0004-6256. Available from: https://dx.doi.org/10.1088/0004-6256/147/6/149.

Basic information

• Original name: Study of Eclipsing Binary and Multiple Systems in OB Associations. II. The Cygnus OB Region: V443 Cyg, V456 Cyg, and V2107 Cyg
• Name in Czech: Studie zákrytových dvojhvězd a násobných systémů v OB asociacích. II. Oblast Cygnus OB: V443 Cyg, V456 Cyg a V2107 Cyg
• Authors: BAKIS, V. (792 Turkey), H. HENSBERGE (56 Belgium), S. BILIR (792 Turkey), H. BAKIS (792 Turkey), F. YILMAZ (792 Turkey), E. KITAN (792 Turkey), O. DEMIRCAN (792 Turkey), Miloslav ZEJDA (203 Czech Republic, guarantor, belonging to the institution) and Zdeněk MIKULÁŠEK (203 Czech Republic, belonging to the institution).
• Edition: The Astronomical Journal, IOP PUBLISHING LTD, 2014, 0004-6256.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10308 Astronomy
• Country of publisher: United Kingdom of Great Britain and Northern Ireland
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 4.024
• RIV identification code: RIV/00216224:14310/14:00076685
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.1088/0004-6256/147/6/149
• UT WoS: 000336262600025
• Keywords (in Czech): zákrytové dvojhvězdy; vzdálenosti hvězd; fundamentální parametry hvězd
• Keywords in English: binaries: eclipsing; stars: distances; stars: fundamental parameters
• Tags: AKR, rivok
• Tags: International impact, Reviewed

Abstract

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 Ms) 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 beta Cep-type pulsations. The Doppler signal of the secondary is barely detectable. A more extensive, asteroseismological study is necessary to fix masses more precisely. Nevertheless, the position of the primary in the H-R diagram confines the age reasonably well to 20+/-Myr, indicating that for Cyg OB1 has a similar extent of star formation history as that established for Cyg OB2.