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A STUDY OF THE RADIAL VELOCITY OF BX ANDROMEDAE

BX ANDROMEDAE의 시선속도 연구

  • Lee, Chung-Uk (Korea Astronomy Observatory, Dept. of Astronomy & Space Science, College of Natural Science and Institute for Basic Science Research , Chungbuk National University) ;
  • Han, In-Woo (Korea Astronomy Observatory) ;
  • Kim, Kang-Min (Korea Astronomy Observatory) ;
  • Kim, Chun-Hwey (Dept. of Astronomy & Space Science, College of Natural Science and Institute for Basic Science Research , Chungbuk National University)
  • 이충욱 (한국천문연구원, 충북대학교 자연과학대학 천문우주학과, 기초과학연구소) ;
  • 한인우 (한국천문연구원) ;
  • 김강민 (한국천문연구원) ;
  • 김천휘 (충북대학교 자연과학대학 천문우주학과, 기초과학연구소)
  • Published : 2004.12.01

Abstract

High resolution spectroscopic observations of BX And using the BOBS (Bohyunsan Optical Echelle Spectrograph) of Bohyunsan Optical Astronomical Observatory (BOAO) were performod during 26-27, Feb. 2003. From the observations, we obtained 38 line spectra of BX And which cover all phases except the phase interval between $0.^p1$ and $0.^p3$. Both methods of the CCF (Cross-Correlation Function) and BF (Broadening Function) were used to get the radial velocities of primary and secondary components. Both velocities of the primary and secondary stars were calculated with the BF method while only primary velocities were determined with the CCF. Using new radial velocity curves, the maximum radial velocities of the primary and secondary stars were obtained as $K_1=90.1km/s\;and\;K_2=196.6km/s$, respectively. New absolute dimension of BX And was deduced with the combination of our spectroscopic solution with the photometric one of Bell et al. (1990).

한국천문연구원 보현산 천문대(Bohyunsan Optical Astronomical Observatory, BOAO)의 BOES(Bohyunsan Optical Echelle Spectrograph)를 이용하여 2003년 2월 26-27일 이틀간에 걸쳐 BX And의 고분산 관측을 수행하였다. 이 관측을 통하여 얻은 스펙트럼은 총 38개로 위상 $0.1{\sim}0.3$에 이르는 구간을 제외하고는 전위상에 걸쳐 골고루 관측이 이루어졌다. 시선속도를 구하기 위하여 BF(Broadening Function)와 CCF(Cross-Correlation Function)를 이용한 방법 이 모두 사용되었다. CCF를 이용하였을 때는 주성의 시선속도만을 얻은 반면, BF인 경우, 주성과 반성의 시선속도 모두를 잘 결정할 수 있었다. 새로운 시선속도곡선으로부터 주성과 반성의 최대 시선속도를 각각 $K_1=96.1km/s$$K_2=196.6km/s$으로 얻었으며, 이를 Bell et al.(1990)의 측광해와 결합하여 BX And의 절대 물리량을 새롭게 결정하였다.

Keywords

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