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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
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)
    -----------------------------------------
     17 17 07.39 +43 08 09.4   M92 = NGC 6341
    -----------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

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)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units  Label    Explanations

   1-  7  A7    ---    Star     Star name (Sandage & Walker 1966ApJ...143..313S)
                                 or Buonanno et al. 1983A&AS...53....1B if not
                                 in Sandage & Walker)
   9- 13  A5    ---    OName    Other name (Buonanno et al. 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

Note (1): References as follows:
   1 = Sandage & Walker, 1966ApJ...143..313S, <NGC 6341 NNNNN>
   2 = Buonanno et al., 1983A&AS...53....1B, <Cl* NGC 6341 Buon NNN>
   3 = Rees, 1992AJ....103.1573R
   4 = 2MASS, Cat. II/246


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   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


Byte-by-byte Description of file: table6.dat

   Bytes Format Units   Label     Explanations

   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


Byte-by-byte Description of file: abund.dat

   Bytes Format Units   Label    Explanations

   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

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.


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    24-Sep-2012