Study of Eclipsing Binary and Multiple Systems in OB Associations. I. Orion OB1a-IM Monocerotis

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dc.authoridBilir, Selcuk/0000-0003-3510-1509
dc.authoridYaz Gokce, Esma/0000-0003-0958-2935
dc.authoridBAKIS, VOLKAN/0000-0002-3125-9010
dc.contributor.authorBakis, Hicran
dc.contributor.authorBakis, Volkan
dc.contributor.authorBilir, Selcuk
dc.contributor.authorMikulasek, Zdenek
dc.contributor.authorZejda, Miloslav
dc.contributor.authorYaz, Esma
dc.contributor.authorDemircan, Osman
dc.date.accessioned2025-01-27T20:39:14Z
dc.date.available2025-01-27T20:39:14Z
dc.date.issued2011
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractAll available photometric and spectroscopic observations were collected and used as the basis of a detailed analysis of the close binary IM Mon. The orbital period of the binary was refined to 1(d). 19024249 (0.00000014). The Roche equipotentials, fractional luminosities (in B, V, and Hp-bands) and fractional radii for the component stars in addition to the mass ratio, q, inclination, i, of the orbit, and the effective temperature, T-eff,, of the secondary cooler less massive component were obtained by the analysis of light curves. IM Mon is classified to be a detached binary system in contrast to the contact configuration estimations in the literature. The absolute parameters of IM Mon were derived by the simultaneous solutions of light and radial-velocity curves as M-1.2 = 5.50 (0.24) M-circle dot and 3.32 (0.16) M-circle dot, R1,2 = 3.15 (0.04) R-circle dot and 2.36 (0.03) R-circle dot, T-eff1.2 = 17500 (350) K and 14500 (550) K implying spectral types of B4 and B6.5 ZAMS stars for the primary and secondary components, respectively. The modelling of the high-resolution spectrum revealed the rotational velocities of the component stars as 17(rot1) = 147 (15) km s(-1) and V-rot2 = 90 (25)km s(-1). The photometric distance of 353 (59) pc was found to be more precise and reliable than the Hipparcos distance of 341 (85) pc. An evolutionary age of 11.5 (1.5) Myr was obtained for IM Mon. Kinematical and dynamical analyses support the membership of the young thin-disk population system IM Mon to the On OB1a association dynamically. Finally, we derived the distance, age, and metallicity information of On OB1a sub-group using information of the IM Mon parameters.
dc.description.sponsorshipScientific & Technological Research Council of Turkey (TUBITAK) [109T449]; [GAAV IAA 301630901]; [GACR 205/08/0003]
dc.description.sponsorshipThis study is fully supported by The Scientific & Technological Research Council of Turkey (TUBITAK) with the project code 109T449. Zdenek Mikulasek is supported by the grants GAAV IAA 301630901 and GACR 205/08/0003. We thank S. N. de Villiers for valuable comments to our text and the anonymous referee who improved the manuscript by his/her very useful comments.
dc.identifier.doi10.1093/pasj/63.5.1079
dc.identifier.endpage1091
dc.identifier.issn0004-6264
dc.identifier.issn2053-051X
dc.identifier.issue5
dc.identifier.scopus2-s2.0-80155158966
dc.identifier.scopusqualityQ2
dc.identifier.startpage1079
dc.identifier.urihttps://doi.org/10.1093/pasj/63.5.1079
dc.identifier.urihttps://hdl.handle.net/20.500.12428/23897
dc.identifier.volume63
dc.identifier.wosWOS:000297089900020
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOxford Univ Press
dc.relation.ispartofPublications of The Astronomical Society of Japan
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectGalaxy: open clusters and associations: individual (Orion OB1a)
dc.subjectstars: binaries : eclipsing
dc.subjectstars: individual (IM Monocerotis)
dc.subjectstars: kinematics
dc.titleStudy of Eclipsing Binary and Multiple Systems in OB Associations. I. Orion OB1a-IM Monocerotis
dc.typeArticle

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