J/ApJ/672/266 ARAUCARIA project: NGC 55 Cepheids JK magnitudes (Gieren+, 2008)
The Araucaria project: near-infrared photometry of Cepheid variables in the
Sculptor galaxy NGC 55.
Gieren W., Pietrzynski G., Soszynski I., Bresolin F., Kudritzki R.-P.,
Storm J., Minniti D.
<Astrophys. J., 672, 266-273 (2008)>
=2008ApJ...672..266G 2008ApJ...672..266G
ADC_Keywords: Stars, variable ; Photometry, infrared
Keywords: Cepheids - distance scale - galaxies: distances and redshifts -
galaxies: individual (NGC 55)
Abstract:
We have obtained deep images in the near-infrared J and K filters of
four fields in the Sculptor group spiral galaxy NGC 55 with the ESO
VLT and ISAAC camera. For 40 long-period Cepheid variables in these
fields, which were recently discovered by Pietrzyski et al., we have
determined mean J and K magnitudes from observations at two epochs,
and derived distance moduli from the observed period-luminosity (PL)
relations in these bands.
Description:
We used deep J- and K-band images recorded with the 8.2m ESO VLT
equipped with the Infrared Spectrometer and Array Camera (ISAAC). Four
2.5'x2.5' fields were observed in service mode on seven nights between
2004 July 18 and September 21.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 74 Journal of the individual J- and K-Band
observations of the 40 NGC 55 Cepheids
table2.dat 64 40 Intensity mean J and K magnitudes for 40 Cepheid
variables in NGC 55
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See also:
J/AJ/128/2815 : ARAUCARIA project: NGC 6822 Cepheid (Pietrzynski+, 2002)
J/A+A/450/873 : ARAUCARIA: NGC 6822 bright var. VI phot. (Mennickent+, 2006)
J/AJ/123/789 : ARAUCARIA project: NGC 300 Cepheid (Pietrzynski+, 2002)
J/AJ/128/1167 : ARAUCARIA project: NGC 300 Cepheid II (Gieren+, 2004)
J/MNRAS/350/679 : ARAUCARIA project: NGC 300 variables (Mennickent+, 2004)
J/AJ/132/2556 : ARAUCARIA project: Cepheids in NGC 55 (Pietrzynski+, 2006)
J/A+A/485/41 : NGC 55 blue massive stars VLT-spectroscopy (Castro+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [cep]
4- 6 I03 --- cep Cepheid number, [PGS2006] cep NNN in Simbad
8- 21 F14.6 d HJDJ J-band HJD observation date
23- 28 F6.3 mag Jmag ?=99.999 Johnson J magnitude
30- 34 F5.3 mag e_Jmag rms uncertainty on Jmag
36- 49 F14.6 d HJDK K-band HJD observation date
51- 56 F6.3 mag Kmag Johnson K magnitude
58- 62 F5.3 mag e_Kmag rms uncertainty on Kmag
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [cep]
4- 6 I03 --- cep Cepheid number, [PGS2006] cep NNN in Simbad
8 I1 h RAh Hour of Right Ascension (J2000) (1)
10- 11 I2 min RAm Minute of Right Ascension (J2000) (1)
13- 17 F5.2 s RAs Second of Right Ascension (J2000) (1)
19 A1 --- DE- Sign of the Declination (J2000) (1)
20- 21 I2 deg DEd Degree of Declination (J2000) (1)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000) (1)
26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1)
31- 38 F8.4 d Per Period
40- 45 F6.3 mag <Jmag> Intensity mean Johnson J magnitude
47- 51 F5.3 mag e_<Jmag> rms uncertainty on Jmag
53- 58 F6.3 mag <Kmag> Intensity mean Johnson K magnitude
60- 64 F5.3 mag e_<Kmag> rms uncertainty on Kmag
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Note (1): Star positions, from Pietrzynski et al., 2006, Cat. J/AJ/132/2556
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Jun-2008