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DETERMINATIONS OF ITS ABSOLUTE DIMENSIONS AND DISTANCE BY THE ANALYSES OF LIGHT AND RADIAL-VELOCITY CURVES OF THE CONTACT BINARY - II. CK Bootis

접촉쌍성의 광도와 시선속도곡선의 분석에 의한 절대 물리량과 거리의 결정-II. CK Bootis

  • Lee, Jae-Woo (Department of Astronomy & Space Science, College of Natural Sciences and Institute for Basic Science Research, Chungbuk National University, Korea Astronomy Observatory) ;
  • Lee, Chung-Uk (Korea Astronomy Observatory) ;
  • Kim, Chun-Hwey (Department of Astronomy & Space Science, College of Natural Sciences and Institute for Basic Science Research, Chungbuk National University) ;
  • Kang, Young-Beom (Korea Astronomy Observatory) ;
  • Koo, Jae-Rim (Korea Astronomy Observatory)
  • 이재우 (충북대학교 자연과학대학 천문우주학과, 기초과학연구소, 한국천문연구원) ;
  • 이충욱 (한국천문연구원) ;
  • 김천휘 (충북대학교 자연과학대학 천문우주학과, 기초과학연구소) ;
  • 강용범 (한국천문연구원) ;
  • 구재림 (한국천문연구원)
  • Published : 2004.12.01

Abstract

We completed the light curves of the contact binary CK Boo for 13 nights from June to July in 2004 using the 1-m reflector and BVR filters at Mt. Lemmon Optical Astronomy Observatory, and determined four new times of minimum light (three timings for primary eclipse, one for secondary). With contact mode of the 1998-version Wilson-Devinney binary model, we analyzed our BVR light curves and Rucinski & Lu (1999)'s radial-velocity ones. As a result, we found CK boo to be A-type over-contact binary ($f=84\%$) with the low mass ratio (q=0.11) and orbital inclination ($i=65^{\circ}$). Absolute dimensions of the system are determined from our new solution; $M_1=1.42Me{\odot},\;M_2=0.15M{\odot},\;R_1=1.47R{\odot},\;R_2=0.59M{\odot}$ and the distance to it is derived as about 129pc. Our distance is well consistent with that ($157{\pm}33pc$) from the Hipparcos trigonometric parallax within the limit of the error yielded by the latter.

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