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Metal-poor globular clusters (GCs) show intriguing Al-Mg and Si-Alcorrelations, which are important clues to decipher the multiple populationphenomenon. NGC 5053 is one of the most metal-poor GCs, and has been suggestedto be associated with the Sagittarius dwarf galaxy (Sgr), due to its similarlocation and radial velocity with one of the Sgr arms. In this work, wesimulate the orbit of NGC 5053, and argue against the connection between Sgrand NGC 5053. Meanwhile, Mg, Al, and Si spectral lines, which are difficult todetect in the optical spectra, have been detected in the near-infrared APOGEEspectra. We use three different sets of stellar parameters and codes to derivethe Mg, Al, and Si abundances, and we always see a large Al variation, and asubstantial Si enhancement. Comparing with other metal-poor GCs, we suggestmetallicity may not be the only parameter that controls the multiplepopulations.

On The Metal-poor non-Sagittarius Globular Cluster NGC 5053: Orbit, Mg, Al, and Si