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J/A+A/543/A160      Normalized spectra of 82 Kepler red giants (Thygesen+, 2012)
Atmospheric parameters of 82 red giants in the Kepler field.
    Thygesen A.O., Frandsen, S., Bruntt H., Kallinger T., Andersen M.F.,
    Elsworth Y.E., Hekker S., Karoff C., Stello D., Brogaard K., Burke C.,
    Caldwell D.A., Christiansen J.L.
    <Astron. Astrophys. 543, A160 (2012)>
    =2012A&A...543A.160T        (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Spectroscopy

Keywords: stars: abundances - stars: fundamental parameters -
          methods: observational - techniques: spectroscopic

Abstract:
    Accurate fundamental parameters of stars are essential for the
    asteroseismic analysis of data from the NASA Kepler mission.

    We aim at determining accurate atmospheric parameters and the
    abundance pattern for a sample of 82 red giants that are targets for
    the Kepler mission.

    We have used high-resolution, high signal-to-noise spectra from three
    different spectrographs. We used the iterative spectral synthesis
    method VWA to derive the fundamental parameters from carefully
    selected high-quality iron lines. After determination of the
    fundamental parameters, abundances of 13 elements were measured using
    equivalent widths of the spectral lines. Results: We identify
    discrepancies in logg and [Fe/H], compared to the parameters based on
    photometric indices in the Kepler Input Catalogue, Cat. V/133 (larger
    than 2.0dex for logg and [Fe/H] for individual stars). The Teff found
    from spectroscopy and photometry shows good agreement within the
    uncertainties. We find good agreement between the spectroscopic logg
    and the logg derived from asteroseismology. Also, we see indications
    of a potential metallicity effect on the stellar oscillations.

    We have determined the fundamental parameters and element abundances
    of 82 red giants. The large discrepancies between the spectroscopic
    logg and [Fe/H] and values in the Kepler Input Catalogue emphasize
    the need for further detailed spectroscopic follow-up of the Kepler
    targets in order to produce reliable results from the asteroseismic
    analysis.

Description:
    Normalized spectra of 82 red giants in the Kepler Field. Target names
    are as found in the Kepler Input Catalogue (Kepler Mission Team 2009)
    Also included spectra of 10 well-studied bright giants observed for
    reference. 9 of the reference giants were chosen from the PASTEL
    catalogue (Soubiran et al., 2010, Cat. B/pastel) and one, HD205512,
    from the work of Luck & Heiter (2007AJ....133.2464L). All targets have
    been shifted to laboratory wavelength using the radial velocities
    quoted in the paper. Two columns are associated with each target file,
    containing wavelength and flux.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
stars.dat         51       92   List of studied giants
sp/*              23       92   Individual spectra
tablea1.dat       94       82   Fundamental atmospheric parameters for all red
                                 giants in our sample
tablea2.dat      109       82   Elemental abundances for all targets where an
                                 asteroseismic logg could be determined


See also:
    V/133    : Kepler Input Catalog (Kepler Mission Team, 2009)
    B/pastel : The PASTEL catalogue (Soubiran+, 2010-)


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

   Bytes Format Units   Label     Explanations

   1- 12  A12   ---     Name      Star name
  14- 15  I2    h       RAh       Right ascension (J2000)
  17- 18  I2    min     RAm       Right ascension (J2000)
  20- 24  F5.2  s       RAs       Right ascension (J2000)
      26  A1    ---     DE-       Declination sign (J2000)
  27- 28  I2    deg     DEd       Declination (J2000)
  30- 31  I2    arcmin  DEm       Declination (J2000)
  33- 37  F5.2  arcsec  DEs       Declination (J2000)
  39- 51  A13   ---     FileName  Name of the spectrum file in subdirectory sp


Byte-by-byte Description of file: sp/*

   Bytes Format Units   Label     Explanations

   2- 11  F10.5 0.1nm   lambda    [3999/8850] Wavelength vector
  14- 23  F10.8 ---     nFlux     Normalized flux


Byte-by-byte Description of file: tablea1.dat

   Bytes Format Units   Label   Explanations

   1- 12  A12   ---     Name    Star name
  14- 17  I4    K       TeffV   Spectroscopic analysis with VWA effective
                                temperature (error 80K)
  19- 22  F4.2  [cm/s2] loggV   Spectroscopic analysis with VWA surface
                                gravity (error 0.2dex)
  24- 27  F4.2  km/s    vtV     Spectroscopic analysis with VWA microturbulent
                                velocity (error 0.15km/s)
  29- 33  F5.2  [-]    [Fe/H]V  Spectroscopic analysis with VWA metallicity,
                                mean of FeI and FeII abundances (0.15dex)
  35- 38  I4    K       TeffA   ?=- Astrometric effective temperature
                                    (error 100K)
  40- 43  F4.2  [cm/s2] loggA   ?=- Astrometric surface gravity
                                    (error 0.1dex)
  45- 48  I4    K       TeffK   ?=- KIC effective temperature
  50- 53  F4.2  [cm/s2] loggK   ?=- KIC surface gravity
  55- 59  F5.2  [-]    [Fe/H]K  ?=- KIC metallicity
  61- 64  I4    K       Teff    ?=- VWA + astrometric effective temperature (1)
  66- 70  F5.2  [-]     [Fe/H]  ?=- VWA + astrometric metallicity, FeII is used
                                     as the measure of [Fe/H] (1)
  72- 75  F4.2  km/s    vt      ?=- VWA + astrometric microturbulent velocity (1)
  77- 79  F3.1  km/s    vsini   Rotational velocity (error=1.0km/s)
  81- 83  F3.1  km/s    vmacro  Macroturbulent velocity (error=1.0km/s)
  85- 90  F6.1  km/s    RV      Radial velocity (error=0.15km/s)
  92- 94  A3    ---     Type    Giant type (2)

Note (1): values are determined from VWA by fixing the gravity at the
           asteroseismic logg.
Note (2): Type of the giant based on their period spacing as follows:
            RGB = red giant branch
            RC = red clump
            SC = secondary clump


Byte-by-byte Description of file: tablea2.dat

   Bytes Format Units   Label     Explanations

   1- 12  A12   ---     Name      Giant name
      13  A1    ---     n_Name    [*] *: KIC9574235 has abundances based on
                                          the spectroscopic logg
  15- 19  F5.2  [-]     [C/H]     ?=- [C/H] abundance (error 0.5dex)
  21- 25  F5.2  [-]     [O/H]     ?=- [O/H] abundance (error 0.5dex)
  27- 31  F5.2  [-]     [Si/H]    ?=- [Si/H] abundance (error 0.2dex)
  33- 37  F5.2  [-]     [Ca/H]    ?=- [Ca/H] abundance (error 0.2dex)
  39- 43  F5.2  [-]     [Sc/H]    ?=- [Sc/H] abundance (error 0.2dex)
  45- 49  F5.2  [-]     [TiI/H]   ?=- [TiI/H] abundance (error 0.2dex)
  51- 55  F5.2  [-]     [TiII/H]  ?=- [TiII/H] abundance (error 0.2dex)
  57- 61  F5.2  [-]     [V/H]     ?=- [V/H] abundance (error 0.2dex)
  63- 67  F5.2  [-]     [CrI/H]   ?=- [CrI/H] abundance (error 0.2dex)
  69- 73  F5.2  [-]     [CrII/H]  ?=- [CrII/H] abundance (error 0.2dex)
  75- 79  F5.2  [-]     [Mn/H]    ?=- [Mn/H] abundance (error 0.2dex)
  81- 85  F5.2  [-]     [FeI/H]   ?=- [FeI/H] abundance (error 0.15dex)
  87- 91  F5.2  [-]     [FeII/H]  ?=- [FeII/H] abundance (error 0.15dex)
  93- 97  F5.2  [-]     [Co/H]    ?=- [Co/H] abundance (error 0.2dex)
  99-103  F5.2  [-]     [Ni/H]    ?=- [Ni/H] abundance (error 0.2dex)
 105-109  F5.2  [-]     [Y/H]     ?=- [Y/H] abundance (error 0.2dex)


History:
   * 16-Jul-2012: on-lien data
   * 24-May-2013: tables A1 and A2 added

Acknowledgements:
    Anders Thygesen, aot06(at)phys.au.dk
(End) A.O. Thygesen [ZAH, Heidelberg], Patricia Vannier [CDS]      25-May-2012