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Paper: High-resolution Near-infrared Spectroscopy of Late-type Stars Near the Galactic Supermassive Black Hole
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 383
Authors: Nishiyama, S.; Kara, T.; Gorin, H.; Kurihara, S.
Abstract: Knowing characteristics of stars very close to the Galactic supermassive black hole has important implications not only for the formation history of the Galactic nuclear star cluster, but for understanding of the stellar dynamics near a supermassive black hole. To determine stellar parameters of stars around Sgr A*, we have conducted near-infrared, high resolution (R15,000) spectroscopy for late-type giants within 0.1 pc from Sgr A*. The effective temperature and metallicity ([M/H]) for two late-type giants, S1-5/S76 and S1-17, have been measured by using the observed near-infrared K band spectra, and the Starkit code with the BOSZ synthetic spectral grid. Both of the stars are likely to be M-type giants with a solar metallicity, and are similar to the stars found further from Sgr A*.
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