2011A&A...527A..50E


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:25:57

2011A&A...527A..50E - Astronomy and Astrophysics, volume 527A, 50-50 (2011/3-1)

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

EVANS C.J., DAVIES B., KUDRITZKI R.-P., PUECH M., YANG Y., CUBY J.-G., FIGER D.F., LEHNERT M.D., MORRIS S.L. and ROUSSET G.

Abstract (from CDS):

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 1.15-1.22µm 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 0.1dex. 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 ∼5Mpc 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.

Abstract Copyright:

Journal keyword(s): instrumentation: adaptive optics - instrumentation: spectrographs - techniques: spectroscopic - Galaxy: stellar content - stars: fundamental parameters

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 706 2
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10904 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9446 1
4 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1306 2
5 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5135 1
6 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
7 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1538 0
8 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1149 3
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
10 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 695 2
11 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 653 2
12 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5825 0
13 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 438 0
14 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 230 0
15 NAME Local Group GrG ~ ~           ~ 6973 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:25:57

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