Stellar metallicities beyond the Local Group: the potential of J-band spectroscopy with extremely large telescopes

Abstract

We present simulated J-band spectroscopy of red giants and supergiants with a 42m European Extremely Large Telescope (E-ELT), using tools developed toward the EAGLE Phase A instrument study. The simulated spectra are used to demonstrate the validity of the 1.15-1.22 micron region to recover accurate stellar metallicities from Solar and metal-poor (one tenth Solar) spectral templates. From tests at spectral resolving powers of four and ten thousand, we require continuum signal-to-noise ratios in excess of 50 (per two-pixel resolution element) to recover the input metallicity to within 0.1 dex. We highlight the potential of direct estimates of stellar metallicites (over the range -1<[Fe/H]<0) of red giants with the E-ELT, reaching out to distances of ~5 Mpc for stars near the tip of the red giant branch. The same simulations are also used to illustrate the potential for quantitative spectroscopy of red supergiants beyond the Local Volume to tens of Mpc. Calcium triplet observations in the I-band are also simulated to provide a comparison with contemporary techniques. Assuming the EAGLE instrument parameters and simulated performances from adaptive optics, the J-band method is more sensitive in terms of recovering metallicity estimates for a given target. This appears very promising for ELT studies of red giants and supergiants, offering a direct metallicity tracer at a wavelength which is less afffected by extinction than shortward diagnostics and, via adaptive optics, with better image quality.

Accepted by A&A, 13 pages

References in corpus (19)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The ACS Nearby Galaxy Survey Treasury
• Extragalactic chemical abundances: do HII regions and young stars tell the same story? The case of the spiral galaxy NGC 300
• The VLT-FLAMES survey of massive stars: Evolution of surface N abundances and effective temperature scales in the Galaxy and Magellanic Clouds
• Analysis and calibration of CaII triplet spectroscopy of Red Giant Branch stars from VLT/FLAMES observations
• The ACS Fornax Cluster Survey. I. Introduction to the Survey and Data Reduction Procedures
• Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
• A kinematically selected, metal-poor stellar halo in the outskirts of M31
• The Araucaria Project: the Local Group Galaxy WLM--Distance and metallicity from quantitative spectroscopy of blue Supergiants
• Tomographic reconstruction for Wide Field Adaptive Optics systems: Fourier domain analysis and fundamental limitations
• The potential of Red Supergiants as extra-galactic abundance probes at low spectral resolution
• Metallicity-corrected Tip of the Red Giant Branch Distance to NGC 4258
• The Stellar Populations of M33's Outer Regions II: Deep ACS Imaging
• The Araucaria Project: VLT-spectroscopy of blue massive stars in NGC 55
• The FALCON concept: multi-object adaptive optics and atmospheric tomography for integral field spectroscopy. Principles and performances on an 8 meter telescope
• The Araucaria Project. Near-Infrared Photometry of Cepheid Variables in the Sculptor Galaxy NGC 55
• The Araucaria Project. The Distance to the Sculptor Group Galaxy NGC 55 from a Newly Discovered Abundant Cepheid Population
• Coupling MOAO with Integral Field Spectroscopy: specifications for the VLT and the E-ELT
• The Physics and Mass Assembly of distant galaxies with the E-ELT

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• Red Supergiant Stars as Cosmic Abundance Probes: NLTE Effects in J-band Iron and Titanium Lines
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• Red Supergiants as Cosmic Abundance Probes: The Magellanic Clouds
• Red Supergiants as Cosmic Abundance Probes: The Sculptor Galaxy NGC 300
• Red Supergiants as Cosmic Abundance Probes: massive star clusters in M83, and the mass-metallicity relation of nearby galaxies
• Red Supergiants as cosmic abundance probes: the first direct metallicity determination of NGC 4038 in the Antennae
• A New Method for Measuring Metallicities of Young Super Star Clusters
• Quantitative Spectroscopic J-band Study of Red Supergiants in Perseus OB-1
• Chemistry and Kinematics of Red Supergiant Stars in the Young Massive Cluster NGC 2100
• Physical properties of the first spectroscopically confirmed red supergiant stars in the Sculptor Group galaxy NGC 55
• The VLT-FLAMES Tarantula Survey XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula
• Red supergiant stars in binary systems. I. Identification and characterisation in the Small Magellanic Cloud from the UVIT ultraviolet imaging survey
• Infrared Telescope Facility (IRTF) spectral library II: New indices in Y, J, H, and L atmospheric windows
• A non-LTE study of silicon abundances in giant stars from the Si I infrared lines in the zJ-band
• Science Case and Requirements for the MOSAIC Concept for a Multi-Object Spectrograph for the European Extremely Large Telescope
• The EAGLE instrument for the E-ELT: developments since delivery of Phase A