천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제46권1호
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- Pages.34.3-34.3
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- 2021
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- 1226-2692(pISSN)
Messier 3: An Extra-Galactic System with Two Globular Clusters
- Lee, Jae-Woo (Department of Physics and Astronomy, Sejong University) ;
- Sneden, Christopher (Department of Astronomy, The University of Texas at Austin)
- 발행 : 2021.04.13
초록
We present Ca-CN-CH-NH photometry for the globular cluster (GC) M3. Our new photometric system combined with robust and self-consistent theoretical fine model grids allows us to measure key elements in stellar populations, [Fe/H], [C/Fe], and [N/Fe], even in the extremely crowded fields. Our results show that M3 consists of two GCs with different chemical abundances, structural and kinematical properties. Furthermore, each GC has its own carbon-nitrogen anticorrelation with whose fractions of the CN-weak populations are consistent with those in the Magellanic Clouds. We suggest that M3 is a merger remnant of two GCs, most likely in a dwarf galaxy environment and accreted to our Milky Way Galaxy later in time.
키워드