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J/ApJ/679/71          Mid-IR period-luminosity relations       (Freedman+, 2008)

The Cepheid period-luminosity relation at mid-infrared wavelengths. I. First-epoch LMC data. Freedman W.L., Madore B.F., Rigby J., Persson S.E., Sturch L. <Astrophys. J., 679, 71-75 (2008)> =2008ApJ...679...71F
ADC_Keywords: Stars, variable ; Magellanic Clouds ; Photometry, infrared Keywords: Cepheids - distance scale - infrared: stars - Magellanic Clouds Abstract: We present the first mid-infrared period-luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids. Single-epoch observations of 70 Cepheids were extracted from Spitzer IRAC observations at 3.6, 4.5, 5.8 and 8.0um, serendipitously obtained during the SAGE (Surveying the Agents of a Galaxy's Evolution) imaging survey of the LMC. All four mid-infrared PL relations have nearly identical slopes over the period range 6-88 days, with a small scatter of only ±0.16mag independent of period for all four of these wavelengths. We emphasize that differential reddening is not contributing significantly to the observed scatter, given the nearly 2 orders of magnitude reduced sensitivity of the mid-IR to extinction compared to the optical. Future observations, filling in the light curves for these Cepheids, should noticeably reduce the residual scatter. These attributes alone suggest that mid-infrared PL relations will provide a practical means of significantly improving the accuracy of Cepheid distances to nearby galaxies. Description: We report here on single-epoch, mid-infrared data for a subset of the Persson et al. (2004, Cat. J/AJ/128/2239) LMC sample, which were observed with Spitzer at 3.6, 4.5, 5.8, and 8.0um. Data for 70 of the 92 Persson et al. Cepheids were serendipitously obtained in the course of the SAGE project (Meixner et al., 2006, Cat. J/AJ/132/2268). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 58 70 Mid-infrared Cepheid photometry
See also: J/A+A/303/137 : EROS Variables: Cepheids in the bar of LMC (Beaulieu+ 1995) J/AJ/128/2239 : JHKs photometry of 92 LMC Cepheids (Persson+, 2004) J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006) J/A+A/462/599 : JHKs photometry of LMC cluster Cepheids (Testa+, 2007) J/A+A/476/73 : Calibration of Cepheid Period/Luminosity relation (Fouque+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Cepheid name (HV NNNNN) 10- 14 F5.3 [d] LogP Log of the period 16- 20 F5.2 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude 22- 25 F4.2 mag e_3.6mag Error in 3.6mag 27- 31 F5.2 mag 4.5mag Spitzer/IRAC 4.5 micron band magnitude 33- 36 F4.2 mag e_4.5mag Error in 4.5mag 38- 42 F5.2 mag 5.8mag Spitzer/IRAC 5.8 micron band magnitude 44- 47 F4.2 mag e_5.8mag Error in 5.8mag 49- 53 F5.2 mag 8.0mag Spitzer/IRAC 8.0 micron band magnitude 55- 58 F4.2 mag e_8.0mag Error in 8.0mag
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 22-Sep-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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