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Elemental Abundances in M31: [Fe/H] and [ α /Fe] in M31 Dwarf Galaxies Using Coadded Spectra
The Astrophysical Journal ( IF 5.745 ) Pub Date : 2020-05-27 , DOI: 10.3847/1538-4357/ab8ccb
Jennifer Wojno, Karoline M. Gilbert, Evan N. Kirby, Ivanna Escala, Rachael L. Beaton, Erik J. Tollerud, Steven R. Majewski, and Puragra Guhathakurta

We present chemical abundances of red giant branch (RGB) stars in the dwarf spheroidal (dSph) satellite system of Andromeda (M31), using spectral synthesis of medium-resolution ( R ∼ 6000) spectra obtained with the Keck II telescope and Deep Imaging Multi-Object Spectrometer spectrograph via the Spectroscopic and Photometric Landscape of Andromeda’s Stellar Halo survey. We coadd stars according to their similarity in photometric metallicity or effective temperature to obtain a signal-to-noise ratio (S/N) high enough to measure average [Fe/H] and [ α /Fe] abundances. We validate our method using high S/N spectra of RGB stars in Milky Way globular clusters, as well as deep observations for a subset of the M31 dSphs in our sample. For this set of validation coadds, we compare the weighted average abundance of the individual stars with the abundance determined from the coadd. We present individual and coadded measurements of [Fe/H] and [ α /Fe] for stars in 10 M31 dS...
更新日期:2020-05-27

 

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