Journal
ASTRONOMY & ASTROPHYSICS
Volume 527, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201015986
Keywords
instrumentation: adaptive optics; instrumentation: spectrographs; techniques: spectroscopic; Galaxy: stellar content; stars: fundamental parameters
Categories
Funding
- Royal Astronomical Society
- Alexander-von-Humboldt Foundation
- Agence Nationale de la Recherche [ANR-06-BLAN-0191]
- NASA [NNG 05-GC37G]
- NYSTAR
- STFC [ST/J002364/1, ST/I002871/1, ST/F002963/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002963/1, ST/J002364/1, ST/I002871/1] Funding Source: researchfish
- Agence Nationale de la Recherche (ANR) [ANR-06-BLAN-0191] Funding Source: Agence Nationale de la Recherche (ANR)
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We present simulated J-band spectroscopy of red giants and supergiants with a 42 m 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 mu m 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 similar to 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 affected by extinction than shortward diagnostics and, via adaptive optics, with better image quality.
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