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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국우주과학회 Journal of Astronomy and Space Sciences Journal of Astronomy and Space Sciences 제36권 제3호
- 발행연도
- 2019.1
- 수록면
- 105 - 113 (9page)
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Spectroscopic observations of barium star ζ Capricornus (HD204075) obtained at the 8.2 m telescope of the European Southern Observatory, with a spectral resolving power R = 80,000 and signal to noise ratio greater than 300, were used to refine the atmospheric parameters. We found new values for effective temperature (Teff = 5,300 ± 50 K), surface gravity (log g = 1.82 ±0.15), micro-turbulent velocity (vmicro = 2.52 ± 0.10 km/s), and iron abundance (log N (Fe) = 7.32 ± 0.06). Previously published abundances of chemical elements in the atmosphere of HD204075 were analyzed and no correlations of these abundances with the second ionization potentials of these elements were found. This excludes the possible influence of accretion of hydrogen and helium atoms from the interstellar or circumstellar environment to the atmosphere of this star. The accretion of nuclear processed matter from the evolved binary companion was primary cause of the abundance anomalies. The young age of HD204075 allows an estimation of the time-scale for the creation of the abundance anomalies arising from accretion of interstellar hydrogen and helium as is the case of stars with low magnetic fields; which we estimate should exceed 10^8 years.
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참고문헌 (32)
참고문헌 신청
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Martin Asplund / 2009 / The Chemical Composition of the Sun / Annual Review of Astronomy and Astrophysics 47(1):481~522
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Biémont E / D.R.E.A.M. database on rare Earths at Mons University
Erika Böhm‐Vitense / 2006 / The Puzzle of the Metallic Line Stars / Publications of the Astronomical Society of the Pacific 118(841):419~435
Martin Asplund / 2009 / The Chemical Composition of the Sun / Annual Review of Astronomy and Astrophysics 47(1):481~522
Bagnulo S / 2003 / The UVES paranal observatory project: a library of high-resolution spectra of stars across the hertzsprung-russell diagram / The Messenger 114:10
Biémont E / D.R.E.A.M. database on rare Earths at Mons University
Erika Böhm‐Vitense / 2006 / The Puzzle of the Metallic Line Stars / Publications of the Astronomical Society of the Pacific 118(841):419~435
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