J/AJ/128/2239 JHKs photometry of 92 LMC Cepheids (Persson+, 2004)
New cepheid period-luminosity relations for the Large Magellanic Cloud:
92 near-infrared light curves.
Persson S.E., Madore B.F., Krzeminski W., Freedman W.L., Roth M.,
Murphy D.C.
<Astron. J., 128, 2239-2264 (2004)>
=2004AJ....128.2239P 2004AJ....128.2239P
ADC_Keywords: Stars, variable ; Magellanic Clouds ; Photometry, infrared
Keywords: Cepheids - distance scale - Magellanic Clouds - stars: oscillations
Abstract:
Near-infrared J, H, and Ks photometric measurements of 92 Cepheids in
the Large Magellanic Cloud are presented. The stars are spread over
the face of the Cloud, their periods range from 3 to 100 days, and
their light curves are sampled at an average of 22 phase points per
star. The intensity-weighted mean magnitudes and colors define
period-luminosity-color (PL or PLC) relations whose uncertainties due
to differential metal abundance and reddening/extinction effects are
minimal. The dispersions in the infrared PL, PLC, and extinction-free
period-Wesenheit relations are extremely small, amounting to less than
0.10mag (or 5% in distance).
Description:
The observations were carried out on the 1m Swope and 2.5m duPont
telescopes at Las Campanas Observatory between 1993 and 1997.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 63 2120 Infrared Photometry of All 92 LMC Cepheids
table3.dat 84 92 LMC Cepheid Infrared Magnitudes
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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- 7 A7 --- Name Cepheid name
9- 14 F6.3 mag Jmag ? The J-band magnitude
16- 20 F5.3 mag e_Jmag ? The 1σ error in Jmag
22- 27 F6.3 mag Hmag ? The H-band magnitude
29- 33 F5.3 mag e_Hmag ? The 1σ error in Hmag
35- 40 F6.3 mag Ksmag ? The Ks band magnitude
42- 46 F5.3 mag e_Ksmag ? The 1σ error in Ksmag
48- 57 F10.2 d JD Julian Date
59- 63 F5.3 --- Phase Phase
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Cepheid name
9- 18 F10.6 d Per Period
20- 25 I6 arcsec xi Wesselink (1959MNRAS.119..576W 1959MNRAS.119..576W)
ξ coordinate (1)
27- 32 I6 arcsec eta Wesselink (1959MNRAS.119..576W 1959MNRAS.119..576W)
η coordinate (1)
34- 38 F5.3 mag E(B-V) The (B-V) color excess
40- 45 F6.3 mag Jmag The J-band intensity-mean magnitude
47- 51 F5.3 mag e_Jmag The 1σ error in Jmag
53- 58 F6.3 mag Hmag The H-band intensity-mean magnitude
60- 64 F5.3 mag e_Hmag The 1σ error in Hmag
66- 71 F6.3 mag Ksmag The Ks band intensity-mean magnitude
73- 77 F5.3 mag e_Ksmag The 1σ error in Ksmag
79- 80 I2 --- o_Name Number of observations
82- 84 A3 --- Note Additional notes (2)
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Note (1): These follow the convention that ξ increases east and η
increases north from the fiducial (J2000) position:
(RA0, DEC0) = (5:25:15, -68:53:45).
Note (2): Additional notes are defined as follows:
1 = A 5" diameter was used to avoid star within 10" aperture
2 = A close contaminating star was measured and removed from
10" aperture magnitudes
3 = Faint stars contribute, but less than 1% and are ignored
4 = The HV2279 data not as clean because of serious crowding;
extra uncertainty is included
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 02-May-2005