J/AJ/142/22 Heavy-element dispersion in M92 (Roederer+, 2011)
Heavy-element dispersion in the metal-poor globular cluster M92.
Roederer I.U., Sneden C.
<Astron. J., 142, 22 (2011)>
=2011AJ....142...22R 2011AJ....142...22R
ADC_Keywords: Clusters, globular ; Abundances
Keywords: globular clusters: individual (NGC 6341) -
nuclear reactions, nucleosynthesis, abundances - stars: abundances -
stars: Population II
Abstract:
Dispersion among the light elements is common in globular clusters
(GCs), while dispersion among heavier elements is less common. We
present detection of r-process dispersion relative to Fe in 19 red
giants of the metal-poor GC M92. Using spectra obtained with the Hydra
multi-object spectrograph on the WIYN Telescope at Kitt Peak National
Observatory, we derive differential abundances for 21 species of 19
elements.
Description:
All observations were taken 2010 May 28-31 using the Hydra
multi-object fiber positioner and bench spectrograph on the WIYN 3.5m
Telescope at Kitt Peak National Observatory.
Objects:
-----------------------------------------
RA (2000) DE Designation(s)
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17 17 07.39 +43 08 09.4 M92 = NGC 6341
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 58 39 Photometry, exposure times, and S/N estimates
table3.dat 49 39 Radial velocities and stellar parameters
table6.dat 40 918 Line-by-line abundances
abund.dat 51 399 Stellar abundances (tables 7-13 of the paper)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Star Star name (Sandage & Walker 1966ApJ...143..313S 1966ApJ...143..313S)
or Buonanno et al. 1983A&AS...53....1B 1983A&AS...53....1B if not
in Sandage & Walker)
9- 13 A5 --- OName Other name (Buonanno et al. 1983A&AS...53....1B 1983A&AS...53....1B)
15- 19 F5.2 mag Vmag V magnitude
21- 24 F4.2 mag B-V B-V colour index
26- 29 F4.2 mag V-J ?=- V-J colour index
31- 34 F4.2 mag V-H ?=- V-H colour index
36- 39 F4.2 mag V-K ?=- V-K colour index
41- 43 A3 --- Ref References (1)
45 I1 --- N Number of exposures
47- 52 I6 s ExpTime Exposure time
54- 58 A5 --- S/N Signal-to-noise ratio per pixel in the continuum
near 4000Å
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Note (1): References as follows:
1 = Sandage & Walker, 1966ApJ...143..313S 1966ApJ...143..313S,
2 = Buonanno et al., 1983A&AS...53....1B 1983A&AS...53....1B, <Cl* NGC 6341 Buon NNN>
3 = Rees, 1992AJ....103.1573R 1992AJ....103.1573R
4 = 2MASS, Cat. II/246
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Star Star name
9- 14 F6.1 km/s RV Radial velocity
16- 18 F3.1 km/s sigma Velocity dispersion
20- 23 I4 K Teff ?=- Effective temperature
25- 28 F4.2 [cm/s2] logg ?=- Gravity surface
30- 33 F4.2 km/s vt ?=- Turbulent velocity
35- 38 F4.1 [-] [M/H] ?=- Metallicity
40- 49 A10 --- Notes Notes
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Star Star name
9- 18 A10 --- Species Species identification
20- 21 I2 --- Z Atomic number
23- 29 F7.2 0.1nm Wave Wavelength; Angstroms
31- 35 F5.2 [-] Dabund ? Differential abundance
37- 40 F4.2 [-] e_Dabund ? The 1σ uncertainty in Dabund
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Byte-by-byte Description of file: abund.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Star Star name
9- 18 A10 --- Species Species
20- 21 I2 --- Z Atomic number
23 A1 --- l_logeps Limit flag on logeps
24- 28 F5.2 [-] logeps ? log abundance ε (H=12)
30 A1 --- l_[X/Fe] Limit flag on [X/Fe]
31- 35 F5.2 [-] [X/Fe] ?=- Abundance ratio, [X/Fe] (1)
39- 42 F4.2 [-] e_[X/Fe] ?=- Standard error on [X/Fe] (sigma/sqrt(N)) (2)
46- 49 F4.2 [-] sd[X/Fe] ?=- Standard deviation (sigma) on [X/Fe] (2)
51 I1 --- N ? Number of lines used
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Note (1): [Fe/H], not [X/Fe], is indicated for Fe.
Note (2): These are internal uncertainties only; see Section 3.3 for a
discussion of absolute uncertainties.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 24-Sep-2012