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J/ApJ/647/1056   ARAUCARIA project : NGC 6822 Cepheid variables  (Gieren+, 2006)
The Araucaria Project: an accurate distance to the Local Group galaxy NGC 6822
from near-infrared photometry of Cepheid variables.
    Gieren W., Pietrzynski G., Nalewajko K., Soszynski I., Bresolin F.,
    Kudritzki R.-P., Minniti D., Romanowsky A.
   <Astrophys. J., 647, 1056-1064 (2006)>
   =2006ApJ...647.1056G
ADC_Keywords: Stars, variable ; Photometry, infrared

Keywords: Cepheids - distance scale - galaxies: distances and redshifts -
          galaxies: individual (NGC 6822) - techniques: photometric

Abstract:
    We have measured near-infrared magnitudes in the J and K bands for 56
    Cepheid variables in the Local Group galaxy NGC 6822 with
    well-determined periods and optical light curves in the V and I bands.
    Using the template light-curve approach of Soszyski and coworkers
    (2005PASP..117..823S), accurate mean magnitudes were obtained from
    these data, which allowed us to determine with unprecedented accuracy
    the distance to NGC 6822 from a multi-wavelength period-luminosity
    solution in the VIJK bands.

Description:
    The near-infrared data presented in this paper were collected with two
    instruments: Persson's Auxiliary Nasmyth Infrared Camera (PANIC) at
    the Magellan-Baade telescope at Las Campanas Observatory, and the SOFI
    camera at the ESO NTT telescope at La Silla.
Objects:
    ----------------------------------------------
       RA   (2000)   DE       Designation(s)
    ----------------------------------------------
    19 44 57.8   -14 48 11    NGC 6822 = IC 4895
    ----------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
position.dat      30       56   Cepheid positions, from Cat. J/AJ/128/2815
table1.dat        56      117   Journal of the Individual J and K band
                              Observations of NGC 6822 Cepheids
table2.dat        38       56   Intensity mean J and K magnitudes for 56 Cepheid
                              variables in NGC 6822


See also:
 J/AJ/128/2815   : ARAUCARIA: NGC 6822 Cepheid variables (Pietrzynski+, 2004)
 J/A+A/450/873   : ARAUCARIA: NGC 6822 bright variables (Mennickent+, 2006)
 J/AJ/123/789    : ARAUCARIA: NGC 300 Cepheid variables (Pietrzynski+, 2002)
 J/AJ/128/1167   : ARAUCARIA: NGC 300 Cepheid Variables. II (Gieren+, 2004)
 J/MNRAS/350/679 : ARAUCARIA: NGC 300 variables BV phot. (Mennickent+, 2004)
 J/AJ/132/2556   : ARAUCARIA: Cepheids in NGC 55 (Pietrzynski+, 2006)
 J/ApJ/672/266   : ARAUCARIA: NGC 55 Cepheids JK magnitudes (Gieren+, 2008)
 J/A+A/485/41    : ARAUCARIA: NGC 55 blue massive stars (Castro+, 2008)


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

   Bytes Format Units   Label     Explanations

   1-  6  A6    ---    [PGU2004]  Cepheid identification
   8- 18  F11.6 d       HJDJ      J band observation Heliocentric Julian Date
  20- 25  F6.3  mag     Jmag      J band magnitude
  27- 31  F5.3  mag     e_Jmag    1σ error in Jmag
  33- 43  F11.6 d       HJDK      K band observation Heliocentric Julian Date
  45- 50  F6.3  mag     Kmag      K band magnitude
  52- 56  F5.3  mag     e_Kmag    1σ error in Kmag


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

   Bytes Format Units   Label     Explanations

   1-  6  A6    ---    [PGU2004]  Cepheid identification
   8- 12  F5.3  [d]     log(P)    Log of the period
  14- 19  F6.3  mag     <Jmag>    Intensity mean J band magnitude
  21- 25  F5.3  mag     e_<Jmag>  The 1σ error in <Jmag>
  27- 32  F6.3  mag     <Kmag>    Intensity mean K band magnitude
  34- 38  F5.3  mag     e_<Kmag>  The 1σ error in <Kmag>


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    11-Jul-2008