We present a method to improve the RV (radial velocity) measurements accuracy by using telluric lines. Telluric lines are used to estimate the wavelength scale drift over the detector of the spectrograph. In the case of BOES, the Echelle spectrograph at BOAO (Bohyunsan Optical Astronomical Observatory), the wavelength scale drift can be several hundreds m/s over 24 hours. Due to the wavelength scale drift, the RV measurements accuracy of BOES is limited to several hundreds m/s. By estimating the wavelength scale drift by telluric lines, we can remove its effect to improve the RV measurements accuracy to about 40 m/s.

ABSTRACT
1. 서론
    파장 눈금 오차 및 그 제거 방법
2. Th-Ar 비교 광원을 이용한 파장눈금 이동 조사
3. 대기 흡수선을 이용한 시선 속도 향상 방법
    특정 영역 j의 견본 스펙트럼 SPECT(j) 만들기.
    천체 스펙트럼의 SPECT(i,j) 선택
    대기 흡수선의 SPECT(i,j) 선택
4. RV 표준성 Tau Ceti와 HD 57727 관측 결과
    별의 SPECT 결정
    대기 흡수선의 SPECT 결정
    처리 결과
5. 논의 및 결론
참고 문헌

• 한인우(한국천문연구원) | INWOO HAN (Korea Astronomy and Space Science Institute)
• 김강민(한국천문연구원) | KANG-MIN KIM (Korea Astronomy and Space Science Institute)
• 강동일(경상남도과학교육원) | DONG-IL KANG (Gyeongsangnamdo Institute of Science Education)
• 이병철(한국천문연구원, 경북대학교) | BYEONG-CHEOL LEE (Korea Astronomy and Space Science Institute, Department of Astronomy and Atmospheric Sciences, Kyungpook National University)