Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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PERIOD CHANCE OF THE CONTACT BINARY AH Tauri

접촉쌍성 AH Tauri의 공전주기 변화

  • Lee, Dong-Joo (Korea Astronomy Observatory, Dept. of Astronomy & Space Science, College of Natural Science and Institute for Basic Science Research, Chungbuk National University) ;
  • Lee, Chung-Uk (Korea Astronomy Observatory, Dept. of Astronomy & Space Science, College of Natural Science and Institute for Basic Science Research, Chungbuk National University) ;
  • Lee, Jae-Woo (Korea Astronomy Observatory, Dept. of Astronomy & Space Science, College of Natural Science and Institute for Basic Science Research, Chungbuk National University) ;
  • Kim, Seung-Lee (Korea Astronomy Observatory) ;
  • Oh, Kyu-Dong (Department of Earth Science Education, Chonnam National University) ;
  • Kim, Chun-Hwey (Dept. of Astronomy & Space Science, College of Natural Science and Institute for Basic Science Research, Chungbuk National University)
  • 이동주 (한국천문연구원, 충북대학교 천문우주학과) ;
  • 이충욱 (한국천문연구원, 충북대학교 천문우주학과) ;
  • 이재우 (한국천문연구원, 충북대학교 천문우주학과) ;
  • 김승리 (한국천문연구원) ;
  • 오규동 (전남대학교 지구과학교육과) ;
  • 김천휘 (충북대학교 천문우주학과)
  • Published : 2004.12.01

Abstract

New BV RI photometric observations of the contact binary AH Tau were performed with the 61 cm reflector and a 2K CCD camera at the Sobaeksan Optical Astronomy Observatory during seven nights from September to December, 2001. A total of 144 times of minima observed up to date, including three times of minima obtained from our observation, were analyzed. It is found that the orbital period of AH Tau has varied in a cyclic way superposed on a secular period decrease. The rate of the secular period decrease is calculated to be $1^s$ .04 per century, implying that a mass of about $3.8{\times}10^{-8}M{\odot}/yr$ from the more massive primary flows into the secondary if a conservative mass transfer is assumed. Assuming that the sinusoidal period variation is produced by a light-time effect due to an unseen third body, the resultant semi-amplitude, period, and eccentricity for the deduced light-time orbit are obtained as 35.4 years, 0.014 day and 0.52, respectively. The mass of the third-body is calculated as a tout $0.24M{\odot}$ when the third body is assumed to be coplanar with AH Tau system.

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