Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Photometric Classification of the Variable Star TU UMi

측광학적 방법을 이용한 TU UMi의 변광성 분류

  • Lee, Ho (Department of Earth Science Education, Korea National University of Education) ;
  • Kim, Seung-Lee (Korea Astronomy and Space Science Institute) ;
  • Jo, Mi-Sun (Department of Earth Science Education, Korea National University of Education) ;
  • Lee, Jae-Woo (Korea Astronomy and Space Science Institute) ;
  • Park, Hong-Suh (Department of Earth Science Education, Korea National University of Education)
  • 이호 (한국교원대학교 제3대학 지구과학교육과) ;
  • 김승리 (한국천문연구원) ;
  • 조미선 (한국교원대학교 제3대학 지구과학교육과) ;
  • 이재우 (한국천문연구원) ;
  • 박홍서 (한국교원대학교 제3대학 지구과학교육과)
  • Published : 2006.12.30
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Abstract

We present B, V, I time series CCD photometry for the variable star TU UMi to classify its variable type. The observations were performed using 61cm telescope equipped with 2K CCD camera at Sobaeksan Optical Astronomy Observatory (SOAO). Judging from the amplitude ratio $({\Delta}i/{\Delta}v)$ and color variation $({\Delta}(b-v),\;{\Delta}(v-i))$. TU UMi should be a W UMa type eclipsing binary. We obtained two primary times of minimum lights (HJD 2453848.0446, HJD 2453848.2309) from our observations and determined new orbital elements (Min I=HJD 2452500.1344+0.37708907${\times}$E) for TU UMi.

변광성 TU UMi의 변광 유형의 분류를 위하여 소백산 천문대 0.6m광학 망원경과 2K CCD 카메라를 이용하여 B, V, I 필터를 이용한 시계열 측광 관측을 수행하였다. 변광성의 분류를 위하여 V 필터와 I 필터로부터 얻은 광도 곡선의 진폭의 비$({\Delta}i/{\Delta}v)$, 색의 변화$({\Delta}(b-v),\;{\Delta}(v-i))$로 부터 TU UMi가 W UMa형 식쌍성임을 확인하였으며, 우리의 관측 자료에서 2개의 극심 시각(UJD 2453848.04456, HJD 2453848.23088)을 구하였고, 새로운 광도 요소(Min I=HJD 2452500.1344+0.37708907${\times}$E)를 결정하였다.

Keywords

References

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