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J/ApJ/724/975  Heavy elements abundances of metal-poor stars  (Roederer+, 2010)
The ubiquity of the rapid neutron-capture process.
    Roederer I.U., Cowan J.J., Karakas A.I., Kratz K.-L., Lugaro M.,
    Simmerer J., Farouqi K., Sneden C.
   <Astrophys. J., 724, 975-993 (2010)>
   =2010ApJ...724..975R
ADC_Keywords: Abundances ; Equivalent widths ; Stars, metal-deficient ;
              Stars, giant
Keywords: nuclear reactions, nucleosynthesis, abundances - stars: abundances -
          stars: Population II

Abstract:
    To better characterize the abundance patterns produced by the
    r-process, we have derived new abundances or upper limits for the
    heavy elements zinc (Zn, Z=30), yttrium (Y, Z=39), lanthanum (La,
    Z=57), europium (Eu, Z=63), and lead (Pb, Z=82). Our sample of 161
    metal-poor stars includes new measurements from 88 high-resolution and
    high signal-to-noise spectra obtained with the Tull Spectrograph on
    the 2.7m Smith Telescope at the McDonald Observatory, and other
    abundances are adopted from the literature. We use models of the
    s-process in asymptotic giant branch stars to characterize the high
    Pb/Eu ratios produced in the s-process at low metallicity, and our new
    observations then allow us to identify a sample of stars with no
    detectable s-process material.

Description:
    Simmerer et al. (2004, Cat. J/ApJ/617/1091) obtained high-resolution
    (R∼60000) and high signal-to-noise ratio (S/N∼100 at 4100Å) spectra
    for 88 bright (V≤11.0) metal-poor dwarf and giant stars from the halo
    and disk using the Tull Cross-dispersed Echelle Spectrograph on the
    2.7m Smith Telescope at the McDonald Observatory. We adopt the
    atmospheric parameters from Simmerer et al. (2004, Cat. J/ApJ/617/1091)
    and derive new zinc (Zn, Z=30), Y, and Pb abundances for the stars in
    this sample.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        36       83   Zinc and yttrium equivalent widths
table2.dat        66      161   Stellar abundances
refs.dat          70       36   References


See also:
 J/ApJ/711/573  : Detailed abundances in a halo stellar stream (Roederer+, 2010)
 J/A+A/516/A46  : HE 2327-5642 abundance analysis (Mashonkina+, 2010)
 J/ApJS/182/80  : Rare earth abundances (Sneden+, 2009)
 J/ApJ/689/1031 : Heavy element abundances in giant stars (Yong+, 2008)
 J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)
 J/ApJ/645/613  : Abundances of HD 221170 (Ivans+, 2006)
 J/A+A/439/129  : HERES II. Spectroscopic analysis (Barklem+, 2005)
 J/ApJ/617/1091 : La and Eu abundances in 85 stars (Simmerer+, 2004)
 J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)
 J/A+A/403/1105 : Extremely metal-poor giants EWs (Francois+, 2003)
 J/AJ/120/1841  : Abundances and Kinematics of Halo and Disk Stars (Fulbright
                  2000)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1- 10  A10   ---     Star      Star identification
  12- 15  F4.1  0.1pm   ZnI47     ZnI 4722.16Å equivalent width in mÅ
  17- 20  F4.1  0.1pm   ZnI48     ? ZnI 4810.54Å equivalent width in mÅ
  22- 26  F5.1  0.1pm   YII48     ? YII 4833.68Å equivalent width in mÅ
  28- 31  F4.1  0.1pm   YII50     ? YII 5087.42Å equivalent width in mÅ
  33- 36  F4.1  0.1pm   YII52     ? YII 5200.41Å equivalent width in mÅ


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

   Bytes Format Units  Label      Explanations

   1- 15  A15   ---    Star       Star identification
  17- 21  F5.2  [Sun]  [Fe/H]     Abundance of [Fe/H]
  23- 24  I2    ---    r_[Fe/H]   Reference for [Fe/H] (see refs.dat file)
  26- 30  F5.2  [-]    log(ZnI)   ? Log of ZnI abundance (log(N/H)+12)
  32- 36  F5.2  [-]    log(YII)   ? Log of YII abundance (log(N/H)+12)
  38- 42  F5.2  [-]    log(LaII)  ? Log of LaII abundance (log(N/H)+12)
  44- 48  F5.2  [-]    log(EuII)  ? Log of EuII abundance (log(N/H)+12)
      50  A1    ---   l_log(PbI)  Limit flag on loge(PbI)
  51- 55  F5.2  [-]    log(PbI)   ? Log of PbI abundance (log(N/H)+12)
  57- 64  A8    ---    Ref        Reference(s) (see refs.dat file)
      66  I1    ---    Class      [0/3] Classification code (1)

Note (1): Classification as follows:
  1 = logε(Pb/Eu)<+1.8
  2 = member of the stellar stream analyzed by Roederer et al. (2010,
      Cat. J/ApJ/711/573)
  3 = logε(Pb/Eu)<+0.9, as well as HD 88609 and HD 122563
  0 = none of 1-3 or [Fe/H]≥-1.4.


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

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     Ref       Code reference
   4- 22  A19   ---     BibCode   Bibcode
  24- 42  A19   ---     Aut       First author's name
  44- 70  A27   ---     Comm      Comment


History:
    From electronic version of the journal
(End)                                     Emmanuelle Perret [CDS]    02-Aug-2012