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 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 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