Detailed abundances for the old population near the galactic center. I. Metallicity distribution of the nuclear star cluster
(2017) In The Astronomical Journal 154(6).- Abstract
We report the first high spectral resolution study of 17 M giants kinematically confirmed to lie within a few parsecs of the Galactic center, using R ~ 24,000 spectroscopy from Keck/NIRSPEC and a new line list for the infrared K band. We consider their luminosities and kinematics, which classify these stars as members of the older stellar population and the central cluster. We find a median metallicity of á[Fe H]ñ = -0.16 and a large spread from approximately -0.3 to +0.3 (quartiles). We find that the highest metallicities are [Fe H] < +0.6, with most of the stars being at or below the solar iron abundance. The abundances and the abundance distribution strongly resemble those of the Galactic bulge rather than the disk or halo; in our... (More)
We report the first high spectral resolution study of 17 M giants kinematically confirmed to lie within a few parsecs of the Galactic center, using R ~ 24,000 spectroscopy from Keck/NIRSPEC and a new line list for the infrared K band. We consider their luminosities and kinematics, which classify these stars as members of the older stellar population and the central cluster. We find a median metallicity of á[Fe H]ñ = -0.16 and a large spread from approximately -0.3 to +0.3 (quartiles). We find that the highest metallicities are [Fe H] < +0.6, with most of the stars being at or below the solar iron abundance. The abundances and the abundance distribution strongly resemble those of the Galactic bulge rather than the disk or halo; in our small sample we find no statistical evidence for a dependence of velocity dispersion on metallicity.
(Less)
- author
- Rich, R. M.
; Ryde, N.
LU
; Thorsbro, B. LU
; Fritz, T. K. ; Schultheis, M. ; Origlia, L. and Jönsson, H. LU
- organization
- publishing date
- 2017-12-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- abundances - stars, center - stars, Galaxy, late-type
- in
- The Astronomical Journal
- volume
- 154
- issue
- 6
- article number
- 239
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85039428619
- wos:000415867300007
- ISSN
- 0004-6256
- DOI
- 10.3847/1538-3881/aa970a
- language
- English
- LU publication?
- yes
- id
- c17b5611-0605-4a78-b09f-3a79ad8dfd68
- date added to LUP
- 2018-01-08 10:35:34
- date last changed
- 2025-02-05 07:24:43
@article{c17b5611-0605-4a78-b09f-3a79ad8dfd68, abstract = {{<p>We report the first high spectral resolution study of 17 M giants kinematically confirmed to lie within a few parsecs of the Galactic center, using R ~ 24,000 spectroscopy from Keck/NIRSPEC and a new line list for the infrared K band. We consider their luminosities and kinematics, which classify these stars as members of the older stellar population and the central cluster. We find a median metallicity of á[Fe H]ñ = -0.16 and a large spread from approximately -0.3 to +0.3 (quartiles). We find that the highest metallicities are [Fe H] < +0.6, with most of the stars being at or below the solar iron abundance. The abundances and the abundance distribution strongly resemble those of the Galactic bulge rather than the disk or halo; in our small sample we find no statistical evidence for a dependence of velocity dispersion on metallicity.</p>}}, author = {{Rich, R. M. and Ryde, N. and Thorsbro, B. and Fritz, T. K. and Schultheis, M. and Origlia, L. and Jönsson, H.}}, issn = {{0004-6256}}, keywords = {{abundances - stars; center - stars; Galaxy; late-type}}, language = {{eng}}, month = {{12}}, number = {{6}}, publisher = {{IOP Publishing}}, series = {{The Astronomical Journal}}, title = {{Detailed abundances for the old population near the galactic center. I. Metallicity distribution of the nuclear star cluster}}, url = {{http://dx.doi.org/10.3847/1538-3881/aa970a}}, doi = {{10.3847/1538-3881/aa970a}}, volume = {{154}}, year = {{2017}}, }