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J/MNRAS/364/272     Elemental abundances in Blanco 1         (Ford+, 2005)
Elemental abundances in the Blanco 1 open cluster.
    Ford A., Jeffries R.D., Smalley B.
   <Mon. Not. R. Astron. Soc., 364, 272-282 (2005)>
   =2005MNRAS.364..272F
ADC_Keywords: Clusters, open ; Abundances, peculiar

Keywords: stars: abundances - stars: late-type -
          open clusters and associations: individual: Blanco 1

Abstract:
    High-resolution spectroscopy is used to determine the detailed
    chemical abundances of a group of eight F- and G-type stars in the
    young open cluster Blanco 1. An average [Fe/H] of +0.04±0.02
    (internal error)±0.04 (external error) is found, considerably
    lower than a previous spectroscopic estimate for this cluster.
    The difference is due mainly to our adoption of significantly
    cooler temperatures that are consistent with both photometric
    and spectroscopic constraints. Blanco 1 exhibits subsolar
    [Ni/Fe](0.18±0.01±0.01), [Si/Fe](0.09±0.02±0.03),
    [Mg/Fe](0.14±0.02±0.03) and [Ca/Fe](0.09±0.03±0.03);
    ratios that are not observed among nearby field stars.

Description:
    High-resolution spectra were collected on 2002 August 2527 using the
    3.9-m Anglo-Australian Telescope and a MITLL3 CCD camera.
Objects:
    ----------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    ----------------------------------------------------------
    00 06 16.3   -30 05 57   W113 = Cl* Blanco 1 WGL 113
    00 02 21.6   -30 08 22   W38  = Cl* Blanco 1 WGL 38
    00 03 29.0   -30 19 27   W60  = Cl* Blanco 1 WGL 60
    00 03 33.6   -30 28 42   W63  = Cl* Blanco 1 WGL 63
    00 03 33.7   -30 15 44   W64  = Cl* Blanco 1 WGL 64
    23 59 26.7   -28 51 14   W8   = Cl* Blanco 1 WGL 8
    00 05 08.2   -30 29 42   ZS141 = Cl* Blanco 1 ZS 141
    00 01 46.5   -29 46 39   ZS58  = Cl* Blanco 1 ZS 58
    ----------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        67        9   Derived atmospheric parameters for sample stars
                              and Sun
table2.dat        40      774   Atomic data and equivalent width measurements
table3.dat       147        9   Abundances for target stars and Sun
table4.dat        18       80   Abundance uncertainties due to estimated
                              atmospheric uncertainties


See also:
    J/A+AS/121/213 : BV photometry of Blanco 1 stars (Panagi+, 1997)
    J/A+AS/76/101  : UBV and uvbyb in zeta Scl cluster (Westerlund+, 1988)
    J/A+A/399/919  : X-ray Luminosities in Blanco 1 (Pillitteri+, 2003)
    J/A+A/421/175  : XMM sources in Blanco 1 (Pillitteri+, 2004)


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

   Bytes Format Units   Label    Explanations

   1-  5  A5    ---     Name     Star name (G1)
   8- 12  A5    ---     ZS       ZS designation (de Epstein & Epstein
                                   (1985AJ.....90.1211D)
  16- 19  F4.2  mag     V-K      ? V-K colour index
  21- 24  I4    K       Teffph   ? Effective temperature derived from photometry
  26- 29  I4    K       Teffsp   Effective temperature derived from spectroscopy
  31- 34  F4.2  [cm/s2] logg     Surface gravity
  36- 40  F5.2  [Sun]   [Fe/H]s  Metallicity
  42- 45  F4.2  [Sun] e_[Fe/H]s  ? rms uncertainty on [Fe/H]
  47- 50  F4.2  km/s    vt       Microturbulent velocity
  52- 54  F3.1  km/s    RV       Radial velocity
  56- 58  F3.1  km/s    e_RV     ? rms uncertainty on RV
  60- 63  F4.1  km/s    vsini    Rotational velocity
  65- 67  F3.1  km/s    e_vsini  ? rms uncertainty on vsini


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

   Bytes Format Units   Label     Explanations

   1-  5  A5    ---     Name      Star name (G1)
   7- 11  A5    ---     Ion       Ion designation
  13- 20  F8.3  0.1nm   Lambda    Wavelength
  22- 26  F5.3  eV      XiP       Excitation potential
  28- 33  F6.3  ---     loggf     Oscillator strength
  35- 39  F5.1  0.1pm   EW        ? Equivalent width
      40  A1    ---     n_EW      [bc] Blended lines (1)

Note (1): Blend flags as follows:
      b = Li I 6707.760 and Li I 6707.910 blended
      c = S I 6757.007 and S I 6757.171 blended


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

   Bytes Format Units   Label     Explanations

   1-  5  A5    ---     Name      Star Name (G1) (1)
   7- 10  F4.2  ---     A(Li)LTE  ? LTE Li abundance
  12- 15  F4.2  ---   e_A(Li)LTE  ? ? rms uncertainty on A(Li)LTE (2)
  17- 20  F4.2  ---     A(Li)     ? NLTE Li abundance
      22  I1    ---     o_A(Li)   ? Number of features used for A(Li) value
  24- 28  F5.2  [Sun]   [C/H]     Abundance [C/H] (1)
  30- 33  F4.2  [Sun]   e_[C/H]   ? rms uncertainty on [C/H] (2)
      35  I1    ---     o_[C/H]   Number of features used for [C/H] value
  37- 41  F5.2  [Sun]   [O/H]LTE  LTE abundance [O/H] (1)
  43- 46  F4.2  [Sun] e_[O/H]LTE  ? rms uncertainty on [O/H]LTE (2)
  48- 52  F5.2  [Sun]   [O/H]     ? NLTE abundance [O/H] (1)
      54  I1    ---     o_[O/H]   Number of features used for [O/H] value
  56- 60  F5.2  [Sun]   [Mg/H]    Abundance [Mg/H] (1)
  62- 65  F4.2  [Sun]   e_[Mg/H]  ? rms uncertainty on [Mg/H] (2)
      67  I1    ---     o_[Mg/H]  Number of features used for [Mg/H] value
  69- 73  F5.2  [Sun]   [Si/H]    Abundance [Si/H] (1)
  75- 78  F4.2  [Sun]   e_[Si/H]  ? rms uncertainty on [Si/H] (2)
      80  I1    ---     o_[Si/H]  Number of features used for [Si/H] value
  82- 86  F5.2  [Sun]   [S/H]     Abundance [S/H] (1)
  88- 91  F4.2  [Sun]   e_[S/H]   ? rms uncertainty on [S/H] (2)
      93  I1    ---     o_[S/H]   Number of features used for [S/H] value
  95- 99  F5.2  [Sun]   [Ca/H]    Abundance [Ca/H] (1)
 101-104  F4.2  [Sun]   e_[Ca/H]  ? rms uncertainty on [Ca/H] (2)
     106  I1    ---     o_[Ca/H]  Number of features used for [Ca/H] value
 108-112  F5.2  [Sun]   [Ti/H]    Abundance [Ti/H] (1)
 114-117  F4.2  [Sun]   e_[Ti/H]  ? rms uncertainty on [Ti/H] (2)
     119  I1    ---     o_[Ti/H]  Number of features used for [Ti/H] value
 121-125  F5.2  [Sun]   [Fe/H]    Abundance [Fe/H] (1)
 127-130  F4.2  [Sun]   e_[Fe/H]  ? rms uncertainty on [Fe/H] (2)
 132-133  I2    ---     o_[Fe/H]  Number of features used for [Fe/H] value
 135-139  F5.2  [Sun]   [Ni/H]    Abundance [Ni/H] (1)
 141-144  F4.2  [Sun]   e_[Ni/H]  ? rms uncertainty on [Ni/H] (2)
 146-147  I2    ---     o_[Ni/H]  Number of features used for [Ni/H] value

Note (1): Last line contains the assuming solar abundances
          (in a log scale, not relative to the Sun)
Note (2): Errors quoted are the standard errors in the measured abundances
          (sigma/n1/2), where n is the number of features used


Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label     Explanations

   1-  5  A5    ---     Name      Star name (G1)
   7-  8  A2    ---     El        Element
  10- 13  F4.2  [Sun]   e[X/H]    ? Net uncertainty in [X/H] (1)
  15- 18  F4.2  [Sun]   e[X/Fe]   ? Net uncertainty in [X/Fe] (1)

Note (1): Quadratic sum of uncertainties due to effective temperature (±100K),
           logg (±0.2), [M/H] (±0.1dex) and microturbulence (±0.2km/s).


Global notes:

Note (G1): Names are
   -  WNNN from Westerlund et al., 1988, Cat. J/A+AS/76/101,
           Cl* Blanco 1 WGL NNN in Simbad
   - ZSNNN from de Epstein & Epstein, 1985AJ.....90.1211D,
           Cl* Blanco 1 ZS NNN in Simbad


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    04-May-2006