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PHOTOMETRIC OBSERVATIONS OF THE CONTACT BINARY SYSTEM V523 CASSIOPEIAE

접촉쌍성 V523 Cas의 측광학적 관측과 분석

  • Jeong Jang-Hae (Dept. of Astronomy and Space Science, Chungbuk National University) ;
  • Kim Chun-Hwey (Dept. of Astronomy and Space Science, Chungbuk National University) ;
  • Lee Yong-Sam (Dept. of Astronomy and Space Science, Chungbuk National University)
  • 정장해 (충북대학교 천문우주학과) ;
  • 김천휘 (충북대학교 천문우주학과) ;
  • 이용삼 (충북대학교 천문우주학과)
  • Published : 2006.09.01

Abstract

A total of 920 observations (230 in ${\Delta}B$, 230 in ${\Delta}V$, 230 in ${\Delta}R$, 230 in ${\Delta}I$) for V523 Cas were made on 5 nights from January 6 to 24 in 2003 using the 61cm telescope with 2K CCD camera of the Sobaeksan Optical Astronomy Observatory of KASI. From our observations 9 times of minimum light were newly determined. Combined analysis of our new BVRI light curves with the double-lined radial velocity curves of the Rucinski et al.'s (2003) were made with the 2004 Wilson-Devinney (WD) binary model to yield new physical parameters of the V523 system. Small asymmetries in light curves were explained with the adoption of a cool spot on the hot primary and a hot spot on the cool secondary.

소백산 천문대의 61cm 망원경과 2K CCD 카메라로 2003년 1월 6일부터 24일까지 5일간 WUMa형 접촉쌍성 V523 Cas를 측광판측하여 총 920개의 관측점(${\Delta}B$: 230점, ${\Delta}V$. 230점, ${\Delta}R$: 230점, ${\Delta}I$: 230점)을 얻었다. 우리의 관측점으로부터 9개의 새로운 극심시각(주극심: 5개, 부극심: 4개)을 산출하였다. 2004년도 Wilson-Devinney(WD) 쌍성 모형으로 우리가 얻은 새로운 BVRI 광도곡선과 Rucinski et al.(2003)의 시선속도 곡선을 결합하여 분석함으로서 V523 Cas의 제 물리요소를 새롭게 산출하였다. 광도곡선에 나타난 작은 비대칭을 온도가 높은 주성의 광구 표면에 차거운 흑점과 반성에 뜨거운 흑점을 가정하여 설명하였다.

Keywords

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Cited by

  1. Period and light-curve study of the contact eclipsing binary V523 Cas vol.44, 2016, https://doi.org/10.1016/j.newast.2015.10.001