Detailed abundances for M giants in two inner bulge fields from Infrared Spectroscopy

Abstract

We report abundance analysis for 30 M giant stars in two inner Galactic bulge fields at (l,b)=(0,-1.75) deg and at (l,b)=(1,-2.65) deg, based on R=25,000 infrared spectroscopy from 1.5-1.8um using NIRSPEC at the Keck II telescope. We find iron abundances of <[Fe/H]>=-0.16 +/- 0.03 dex with a 1-sigma dispersion of 0.12 +/- 0.02 and <[Fe/H]>=-0.21 +/- 0.02 dex, with a 1-sigma dispersion of 0.09+/- 0.016 for the (l,b)=(0,-1.75) and (l,b)=(1,-2.65) deg fields, respectively. In agreement with all prior studies, we find enhanced [alpha/Fe] of +0.3 dex. We confirm the lack of any major vertical abundance or composition gradient in the innermost ~600 pc between Baade's window and 150 pc from the Galactic plane. We also confirm that the known enhancement of alpha elements observed between 500 and 1000 pc from the nucleus is also present over the volume of the inner bulge and may therefore be presumed to be a general characteristic of bulge/bar stars within 1 kpc of the Galactic Center.

Accepted for publication in the Astrophysical Journal. 27 pages manuscript format, 6 figures

References in corpus (14)

• Oxygen, Sodium, Magnesium and Aluminium as tracers of the Galactic Bulge Formation
• Chemical similarities between Galactic bulge and local thick disk red giant stars
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. IV. Two bulge populations
• Stellar Proper Motions in the Galactic Bulge from deep HST ACS/WFC Photometry
• Chemical Abundances of Luminous Cool Stars in the Galactic Center from High-Resolution Infrared Spectroscopy
• The Bulge Radial Velocity Assay (BRAVA): I. Techniques and a Rotation Curve
• Kinematics at the Edge of the Galactic Bulge: Evidence for Cylindrical Rotation
• The Bulge Radial Velocity Assay (BRAVA): I. Sample Selection and a Rotation Curve
• Chemical Evolution of the Galactic Bulge as Derived from High-Resolution Infrared Spectroscopy of K and M Red Giants
• Formation & evolution of the Galactic bulge: constraints from stellar abundances
• The First Detailed Abundances for M giants in the inner Bulge from Infrared Spectroscopy
• High resolution infrared spectroscopy of the old open cluster NGC6791
• Evidence of a Metal Rich Galactic Bar from the Vertex Deviation of the Velocity Ellipsoid
• Abundances in bulge stars from high-resolution, near-IR spectra I. The CNO elements observed during the science verification of CRIRES at VLT

Cited by in corpus (66)

• De Re Metallica: The cosmic chemical evolution of galaxies
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. V. Evidence for a wide age distribution and a complex MDF
• Evidence from APOGEE for the presence of a major building block of the halo buried in the inner Galaxy
• Chemodynamical history of the Galactic Bulge
• The GIRAFFE Inner Bulge Survey (GIBS) III. Metallicity distributions and kinematics of 26 Galactic bulge fields
• The Gaia-ESO Survey: metallicity and kinematic trends in the Milky Way bulge
• The GIRAFFE Inner Bulge Survey (GIBS). I. Survey Description and a kinematical map of the Milky Way bulge
• Light, Alpha, and Fe-Peak Element Abundances in the Galactic Bulge
• Interstellar Extinction Curve Variations Toward the Inner Milky Way: A Challenge to Observational Cosmology
• A New Photometric Model of the Galactic Bar using Red Clump Giants
• The Milky Way bar and bulge revealed by APOGEE DR16 and Gaia EDR3
• Ceci n'est pas a globular cluster: the metallicity distribution of the stellar system Terzan 5
• Constraining the structure and formation of the Galactic bulge from a field in its outskirts. FLAMES-GIRAFFE spectra of about 400 red giants around (l,b)=(0°,-10°)
• Discovery of low-metallicity stars in the central parsec of the Milky Way
• The Terzan 5 puzzle: discovery of a third, metal-poor component
• How Many Components? Quantifying the Complexity of the Metallicity Distribution in the Milky Way Bulge with APOGEE
• Metallicity Distribution Functions, Radial Velocities, and Alpha Element Abundances in Three Off-Axis Bulge Fields
• APOGEE Kinematics I: Overview of the Kinematics of the Galactic Bulge as Mapped by APOGEE
• Metallicity gradients through disk Instability: A simple model for the Milky Way's boxy bulge
• Chemical evolution of the Galactic bulge: different stellar populations and possible gradients
• The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity
• Detailed Abundances for the Old Population near the Galactic Center: I. Metallicity distribution of the Nuclear Star Cluster
• The inner two degrees of the Milky Way. Evidence of a chemical difference between the Galactic Center and the surrounding inner bulge stellar populations
• The role of the Galactic bar in the chemical evolution of the Milky Way
• The Bulge Metallicity Distribution from the APOGEE Survey
• The Metallicity Distribution of the Milky Way Bulge
• Chemical evolution of the inner 2 degrees of the Milky Way bulge: [alpha/Fe] trends and metallicity gradients
• Chemical Abundances of M giants in the Galactic Center: a Single Metal-Rich Population with Low [alpha/Fe]
• Abundances of disk and Bulge giants from high-resolution optical spectra III. Sc, V, Cr, Mn, Co, Ni
• The Milky Way's bulge star formation history as constrained from its bimodal chemical abundance distribution
• Abundances of disk and bulge giants from hi-res optical spectra: II. O, Mg, Ca, and Ti in the bulge sample
• Blanco DECam Bulge Survey (BDBS) II: Project Performance, Data Analysis, and Early Science Results
• GIANO-TNG spectroscopy of red supergiants in the young star cluster RSGC2
• Evidence for a metal-poor population in the inner Galactic Bulge
• Correlations between kinematics and metallicity in the Galactic bulge: a review
• Reconciling the Galactic Bulge Turnoff Age Discrepancy with Enhanced Helium Enrichment
• Evolutionary and pulsation properties of Type II Cepheids
• The Milky Way Bulge: Observed properties and a comparison to external galaxies
• Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569
• Oxygen and zinc abundances in 417 Galactic bulge red giants
• Cool stars in the Galactic Center as seen by APOGEE: M giants, AGB stars and supergiant stars/candidates
• Detailed abundance analysis of a metal-poor giant in the Galactic Center
• Chemical Characterization of the Inner Galactic bulge:North-South Symmetry
• A2A: 21,000 bulge stars from the ARGOS survey with stellar parameters on the APOGEE scale
• Chemical and kinematical properties of Galactic bulge stars surrounding the stellar system Terzan 5
• Chemical abundance analysis of symbiotic giants - III. Metallicity and CNO abundance patterns in 24 southern systems
• Understanding AGB evolution in Galactic bulge stars from high-resolution infrared spectroscopy
• Stroemgren - near-infrared photometry of the Baade's Window. I. The bulge globular cluster NGC6528 and the surrounding field
• Temperatures and metallicities of M giants in the galactic Bulge from low-resolution K-band spectra
• High-resolution CRIRES spectra of Terzan1: a metal-poor globular cluster toward the inner bulge
• Theoretical Models of the Galactic Bulge
• GalMod: a Galactic synthesis population model
• On the likelihoods of finding very metal-poor (and old) stars in the Milky Way's disc, bulge, and halo
• Composite Stellar Populations and Element by Element Abundances in the Milky Way Bulge and Elliptical Galaxies
• Impact of distance determinations on Galactic structure. II. Old tracers
• On the detection of CO and mass loss of Bulge OH/IR stars
• Chemical abundance analysis of symbiotic giants - II. AE Ara, BX Mon, KX TrA, and CL Sco
• A machine learning approach to photometric metallicities of giant stars
• On the manifest link between Terzan 5 and the Galactic bulge
• The multi-zone chemical evolution of the Galactic bulge: predicting abundances for different radial zones
• The Spheroidal Bulge of the Milky Way: Chemodynamically Distinct from the Inner-Thick Disc and Bar
• Modelling the chemical evolution of the Milky Way
• Detailed near-IR stellar abundances of red giants in the Inner Bulge and Galactic Center
• UVES analysis of red giants in the bulge globular cluster NGC 6522
• Blanco DECam Bulge Survey (BDBS) IV: Metallicity Distributions and Bulge Structure from 2.6 Million Red Clump Stars