Access to Astronomical Catalogues

← Click to display the menu
J/AJ/117/981        Estimation of stellar metal abundance. II. (Beers+, 1999)

Estimation of stellar metal abundance. II. A recalibration of the Ca II K technique, and the autocorrelation function method. Beers T.C., Rossi S., Norris J.E., Ryan S.G., Shefler T. <Astron. J. 117, 981 (1999)> =1999AJ....117..981B
ADC_Keywords: Abundances, [Fe/H] ; Radial velocities ; Photometry Keywords: Galaxy: abundances - Galaxy: halo - stars: Population II Abstract: We have recalibrated a method for the estimation of stellar metal abundance, parameterized as [Fe/H], based on medium-resolution (1-2Å) optical spectra (the majority of which cover the wavelength range 3700-4500Å). The equivalent width of the Ca II K line (3933Å) as a function of [Fe/H] and broadband B-V color, as predicted from spectrum synthesis and model atmosphere calculations, is compared with observations of 551 stars with high-resolution abundances available from the literature (a sevenfold increase in the number of calibration stars that were previously available). A second method, based on the Fourier autocorrelation function technique first described by Ratnatunga & Freeman (1989, Cat. V/65), is used to provide an independent estimate of [Fe/H], as calibrated by comparison with 405 standard-star abundances. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 141 551 Observed quantities for program stars table6.dat 147 551 Derived quantities for program stars refs.dat 142 24 References to table6.dat
See also: J/AJ/107/1577 : Halo red giants reddening (Anthony-Twarog+, 1994) J/AJ/115/168 : Kinematics of red giant and RR Lyrae stars (Chiba+ 1998) V/65 : Spectroscopically Selected Halo K Giants (Ratnatunga+ 1989) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Star Star name 18- 27 A10 --- HD HD (Cat. III/135) designation 29- 40 A12 --- DM Durchmustering; BD (Cat. I/122), CD (I/114) or CPD (I/108) designation 42- 49 A8 --- G Giclas (Cat. I/79) designation 51- 55 F5.2 mag Vmag V magnitude 57- 60 F4.2 mag B-V B-V colour index 62- 65 F4.2 mag E(B-V) Reddening 67- 70 F4.2 mag (B-V)0 Dereddened B-V colour index 72- 75 F4.2 mag (B-V)HP2 ? Estimated broadband B-V color obtained from the calibrated Balmer-line indices HP2 77- 80 F4.2 mag (B-V)H8 ? Estimated broadband B-V color obtained from the calibrated Balmer-line indices H8 83- 86 I4 km/s RV Radial velocity 87 A1 --- n_RV [*] *: Radial velocity from Ryan & Norris (1991AJ....101.1835R) 89- 92 F4.2 0.1nm H8 ? Balmer-line index H8 (3889Å) 94- 98 F5.2 0.1nm KP Ca II K index KP 100-103 F4.2 0.1nm HP2 ? Balmer-line index HP2 105-109 F5.2 0.1nm LACF ? Metallicity index log ACF 111-141 A31 --- Tel Telescope code (1)
Note (1): contents of table5: Observational setups for intermediate-resolution spectroscopy ------------------------------------------------------------------------------- Code Telescope Detector Grating Coverage Dispersion lines/mm 0.1nm 0.1nm/pix ------------------------------------------------------------------------------- A1 Mount Stromlo Obs. 1.9 m PCA Coude 3750-4100 0.4 A2 Siding Spring Obs. 2.3 m PCA 1200 3800-4300 0.5 A3 Siding Spring Obs. 2.3 m Loral 1024x1024 1200 3800-4400 0.5 A4 Siding Spring Obs. 2.3 m SITe 1752x532 1200 3750-4600 0.5 BL Las Campanas 2.5 m Reticon 1200 3700-4500 0.3 (0.65) BL Paper I 2D-FRUTTI 1200 3700-4500 0.6 (0.65) BP Palomar 5 m Reticon 1200 3700-4500 0.3 (0.65) BP Paper I 2D-FRUTTI 1200 3700-4500 0.6 (0.65) E1 European Southern Obs. 1.5m Ford 2048x2048 900 3750-4750 0.65 E2 European Southern Obs. 1.5m Loral 2048x2048 HOLO 3750-4600 0.5 KP Kitt Peak National Obs. 2.1m Tek 2048x2048 600 3750-5000 0.65 I Isaac Newton 2.5m Tek 1024x1024 1200 3750-4700 0.9 L Lowell Obs. 1.8m Tek 512x512 900 4000-4250 1.0 O Obs.Haute-Provence 1.9m Tek 512x512 1200 3750-4250 0.9 ------------------------------------------------------------------------------- Note : In dispersion column, rebinned spectra are in parentheses. -------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Star Star designation 19- 21 A3 --- Class Star classification (1) 22 A1 --- n_Class [abc] Note (2) 24- 28 F5.2 mag VMAG Absolute V magnitude 29 A1 --- u_VMAG Uncertainty flag on VMAG 31- 34 I4 pc Dist ? Distance 35 A1 -- u_Dist Uncertainty flag on Dist 37- 41 F5.2 [Sun] [Fe/H]0 Adopted standard abundance 43- 60 A18 ---- r_Star Comma-separated references in file refs.dat 62- 66 F5.2 [Sun] [Fe/H]K1 Estimated abundance based on KP index 68- 72 F5.2 [Sun] [Fe/H]A1 ? Fisrt-pass estimated abundance based on LACF index 74- 78 F5.2 [Sun] [Fe/H]K2 Fisrt-pass estimated abundance based on KP index 80- 83 F4.2 [Sun] e_[Fe/H]K2 rms uncertainty on [Fe/H]K2 85- 89 F5.2 [Sun] [Fe/H]A2 ? Second-pass estimated abundance based on LACF index 91- 94 F4.2 [Sun] e_[Fe/H]A2 ? rms uncertainty on [Fe/H]A2 96-100 F5.2 [Sun] [Fe/H]AK1 Joint abundance estimate (KP and LACF) 102-106 F5.2 [Sun] resAK1 Resulting residual ([Fe/H]AK1-[Fe/H]0) 108-112 F5.2 [Sun] [Fe/H]K3 Third-pass estimated abundance based on KP index (3) 114-117 F4.2 [Sun] e_[Fe/H]K3 rms uncertainty on [Fe/H]K3 119-123 F5.2 [Sun] [Fe/H]A3 ? Third-pass estimated abundance based on LACF index 125-128 F4.2 [Sun] e_[Fe/H]A3 ? rms uncertainty on [Fe/H]A3 130-134 F5.2 [Sun] [Fe/H]AK2 ? Final abundance estimate 136-139 F4.2 [Sun] e_[Fe/H]AK2 ? rms uncertainty on [Fe/H]AK2 141-145 F5.2 [Sun] resAK2 Resulting residual ([Fe/H]AK2-[Fe/H]0) 146-147 A2 --- n_resAK2 [def] Note (4)
Note (1): Classification: AGB: Asymptotic giant branch D: dwarf G: giant HB: horizontal branch SG: supergiant TO: main-sequence turnoff Note (2): the symbols are: a: Colors too blue for 15 Gyr isochrone; see text b: Colors too red for 15 Gyr isochrone; see text c: Near or beyond main-sequence terminus; see text Note (3): [Fe/H]K3 = [Fe/H]K2 - RES2p, where RES2p is the predicted residual obtained from the above fit Note (4): the symbols are: d: Colors outside nominal calibration region; see text e: |K3- A3|>+0.5dex; see text f: |resAK2|>3.0σ; see text
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 51 A28 --- Aut Author names 53-142 A90 --- Com Comments
History: * 19-Apr-1999: From AJ electronic version In Table 4 : NGC 6297 717 misprint of 6397 717. "BS" replaced by "BPS" References: References: Beers et al., Paper I. 1990AJ....100..849B
(End) James Marcout, Patricia Bauer [CDS] 19-Apr-1999
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact