Composition of Giants 1$^{\circ}$ North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Nandakumar, Govind Ryde, Nils Mace, Gregory Kaplan, Kyle F. Nieuwmunster, Niels Jaffe, Daniel Rich, R. Michael Schultheis, Mathias Agertz, Oscar Andersson, Eric Sneden, Christopher Strickland, Emily Thorsbro, Brian |
| author_facet | Nandakumar, Govind Ryde, Nils Mace, Gregory Kaplan, Kyle F. Nieuwmunster, Niels Jaffe, Daniel Rich, R. Michael Schultheis, Mathias Agertz, Oscar Andersson, Eric Sneden, Christopher Strickland, Emily Thorsbro, Brian |
| contents | We report the first high resolution, detailed abundances of 21 elements for giants in the Galactic bulge/bar within $1^\circ$ of the Galactic plane, where high extinction has rendered such studies challenging. Our high S/N and high-resolution, near-infrared spectra of 7 M giants in the inner-bulge, located at ($l,b$)=(0,+1$^{\circ}$), are observed using the IGRINS spectrograph. We report the first multi-chemical study of the inner Galactic bulge, by investigating relative to a robust new Solar Neighborhood sample, the abundance trends of 21 elements, including the relatively difficult to study heavy elements. The elements studied are: F, Mg, Si, S, Ca, Na, Al, K, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, Ce, Nd, and Yb. We investigate bulge membership of all seven stars using distances and orbital simulations, and find that the most metal-poor star may be a halo interloper. Our investigation shows that the inner-bulge also as close as $1^\circ$ North of the Galactic Center displays a similarity to the inner disk sequence, following the high [$α$/Fe] envelope of the Solar vicinity metal-rich population, though no firm conclusions for a different enrichment history are evident from this sample. We find a small fraction of metal-poor stars (\feh$<-0.5$) but most of our stars are mainly of super-solar metallicity. Fluorine is found to be enhanced at high metallicity compared to the solar neighbourhood, but confirmation with a larger sample is required. We will apply this approach to explore populations of the Nuclear Stellar Disk and the Nuclear Star Cluster. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_13991 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Composition of Giants 1$^{\circ}$ North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS Nandakumar, Govind Ryde, Nils Mace, Gregory Kaplan, Kyle F. Nieuwmunster, Niels Jaffe, Daniel Rich, R. Michael Schultheis, Mathias Agertz, Oscar Andersson, Eric Sneden, Christopher Strickland, Emily Thorsbro, Brian Astrophysics of Galaxies Solar and Stellar Astrophysics We report the first high resolution, detailed abundances of 21 elements for giants in the Galactic bulge/bar within $1^\circ$ of the Galactic plane, where high extinction has rendered such studies challenging. Our high S/N and high-resolution, near-infrared spectra of 7 M giants in the inner-bulge, located at ($l,b$)=(0,+1$^{\circ}$), are observed using the IGRINS spectrograph. We report the first multi-chemical study of the inner Galactic bulge, by investigating relative to a robust new Solar Neighborhood sample, the abundance trends of 21 elements, including the relatively difficult to study heavy elements. The elements studied are: F, Mg, Si, S, Ca, Na, Al, K, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, Ce, Nd, and Yb. We investigate bulge membership of all seven stars using distances and orbital simulations, and find that the most metal-poor star may be a halo interloper. Our investigation shows that the inner-bulge also as close as $1^\circ$ North of the Galactic Center displays a similarity to the inner disk sequence, following the high [$α$/Fe] envelope of the Solar vicinity metal-rich population, though no firm conclusions for a different enrichment history are evident from this sample. We find a small fraction of metal-poor stars (\feh$<-0.5$) but most of our stars are mainly of super-solar metallicity. Fluorine is found to be enhanced at high metallicity compared to the solar neighbourhood, but confirmation with a larger sample is required. We will apply this approach to explore populations of the Nuclear Stellar Disk and the Nuclear Star Cluster. |
| title | Composition of Giants 1$^{\circ}$ North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2401.13991 |