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Stellar metallicities beyond the Local Group: the potential of J-band spectroscopy with extremely large telescopes
Evans, C. J.1; Davies, B.2,3,4; Kudritzki, R. -P.5,6; Puech, M.7; Yang, Y.7,8; Cuby, J. -G.9; Figer, D. F.2; Lehnert, M. D.7; Morris, S. L.10; Rousset, G.11
2011-03-01
发表期刊ASTRONOMY & ASTROPHYSICS
卷号527
摘要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.
关键词Instrumentation: Adaptive Optics Instrumentation: Spectrographs Techniques: Spectroscopic Galaxy: Stellar Content Stars: Fundamental Parameters
DOI10.1051/0004-6361/201015986
收录类别SCI
语种英语
WOS记录号WOS:000287484100065
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8094
专题月球与深空探测研究部
作者单位1.Royal Observ Edinburgh, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland
2.Rochester Inst Technol, Rochester, NY 14623 USA
3.Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England
4.Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
5.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
6.Max Planck Inst Astrophys, D-85748 Garching, Germany
7.Observ Paris, GEPI, F-92195 Meudon, France
8.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
9.OAMP, LAM, F-13388 Marseille 13, France
10.Univ Durham, Dept Phys, Durham DH1 3LE, England
11.Observ Paris, LESIA, F-92195 Meudon, France
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Evans, C. J.,Davies, B.,Kudritzki, R. -P.,et al. Stellar metallicities beyond the Local Group: the potential of J-band spectroscopy with extremely large telescopes[J]. ASTRONOMY & ASTROPHYSICS,2011,527.
APA Evans, C. J..,Davies, B..,Kudritzki, R. -P..,Puech, M..,Yang, Y..,...&Rousset, G..(2011).Stellar metallicities beyond the Local Group: the potential of J-band spectroscopy with extremely large telescopes.ASTRONOMY & ASTROPHYSICS,527.
MLA Evans, C. J.,et al."Stellar metallicities beyond the Local Group: the potential of J-band spectroscopy with extremely large telescopes".ASTRONOMY & ASTROPHYSICS 527(2011).
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