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A planetary companion around K-giant ${varepsilon}$ Corona Borealis
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  • A planetary companion around K-giant ${varepsilon}$ Corona Borealis
  • A planetary companion around K-giant ${varepsilon}$ Corona Borealis
저자명
이병철,한인우,박명구,김강민,Lee. Byeong-Cheol,Han. In-Woo,Park. Myeong-Gu,Mkrtichian. David E.,Kim. Kang-Min
간행물명
천문학회보
권/호정보
2012년|37권 1호|pp.77-77 (1 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

We present high-resolution radial velocity measurements of K2 giant ${varepsilon}$ CrB from February 2005 to January 2012 using the fiber-fed Bohyunsan Observatory Echelle Spectrograph at Bohyunsan Optical Astronomy Observatory. We find that the RV measurements for ${varepsilon}$ CrB exhibit a periodic variation of 418 days with a semi-amplitude of 129 m/s. There is no correlation with RV measurements and inhomogeneous surface features by examining chromospheric activity indicator (Ca II H region), the Hipparcos photometry, and bisector velocity span. Thus, Keplerian motion is the most likely explanation, which suggests that the RV variations arise from an orbital motion. Assuming a possible stellar mass of 1.7 $M_{odot}$, for ${varepsilon}$ CrB, we obtain a minimum mass for the planetary companion of 6.7 $M_{Jup}$ with an orbital semi-major axis of 1.3 AU, and an eccentricity of 0.11. We support that more massive stars harbor more massive planetary companions in giant hosting planetary companions (Dollinger et al. 2009), as well as, we discuss the frequency of detected planetary companions with the metallicity distribution in giant (Pasquini et al. 2007; Quirrenbach et al. 2011).