천문학회보 (The Bulletin of The Korean Astronomical Society)

한국천문학회 (The Korean Astronomical Society)
권호 표지

Investigation of the apparent α-bimodality among the galactic bulge stars from the APOGEE database

  • Park, Seunghyeon (Center for Galaxy Evolution Research & Department of Astronomy, Yonsei University) ;
  • Hong, Seungsoo (Center for Galaxy Evolution Research & Department of Astronomy, Yonsei University) ;
  • Jang, Sohee (Center for Galaxy Evolution Research & Department of Astronomy, Yonsei University) ;
  • Lee, Young-Wook (Center for Galaxy Evolution Research & Department of Astronomy, Yonsei University)
  • 발행 : 2019.04.10
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초록

Recent investigation of the APOGEE bulge stars by Zasowski et al. (2018) shows a fraction of stars enhanced in O, Ca, and Mg abundances. It is not clear, however, that this apparent ${\alpha}$-bimodality is reflecting a real feature or an artifact from spectral fitting. We will report our progress in understanding the nature and reality of this phenomenon. We will also discuss the spread in Na abundance among the inner bulge stars with respect to that observed among disk sample.

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