The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 42 Issue 1
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- Pages.42.4-43
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- 2017
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- 1226-2692(pISSN)
ANALYSIS OF LONG PERIOD RADIAL VELOCITY VARIATIONS FOR HD 18438 AND HD 158996
- Bang, Tae-Yang (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
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Lee, Byeong-Cheol
(Korea Astronomy and Space Science Institute) ;
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Jeong, Gwang-hui
(Korea Astronomy and Space Science Institute) ;
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Han, Inwoo
(Korea Astronomy and Space Science Institute) ;
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Park, Myeong-Gu
(Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
- Published : 2017.04.10
Abstract
We investigate the long-period radial velocity (RV) variations for M giant HD 18438 and K giant HD 158996 using the high-resolution Bohyunsan Observatory Echelle Spectrograph at the 1.8m telescope of Bohyunsan Optical Astronomy Observatory in Korea. These two target stars are important because HD 18438 is the largest star and HD 158996 is the brightest star for exoplantary system candidate so we can understarnd how evolved stars affect planets by researching these stars. We calculated precise RV measurements of 38 and 24 spectra from November 2010 to January 2017 and June 2010 to January 2017, respectively. We dreived the RV variation period for 719.0 days of HD 18438, 775.6 days for HD 158996. We conclude that the RV variation of HD 158996 is caused by planetary companion which has the mass of 14.7 MJup, semi-major axis of 2.2 AU, and eccentricity of 0.27 assuming the stellar mass of
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