J/ApJ/694/1237 BVRI light curves of NGC 247 Cepheids (Madore+, 2009)
The Cepheid distance to NGC 0247.
Madore B.F., Freedman W.L., Catanzarite J., Navarrete M.
<Astrophys. J., 694, 1237-1249 (2009)>
=2009ApJ...694.1237M 2009ApJ...694.1237M
ADC_Keywords: Stars, variable ; Photometry, UBVRI
Keywords: Cepheids - galaxies: distances and redshifts -
galaxies: individual (NGC 0247)
Abstract:
We report VRI CCD observations of nine Cepheids in the South Polar
(Sculptor) Group spiral galaxy NGC 0247. Periods of these Cepheids
range from 20 to 70 days. Over the past 20 years, the brightest
Cepheid in our sample, NGC 0247:[MF09] C1, has decreased its period by
6%, faded by 0.8mag in the V band, and become bluer by 0.23mag in
(V-I).
Description:
Observations for this program were carried out over a span of eight
years (giving a time baseline of almost 3000 days). Observation began
first at the Cerro Tololo 4m, and was completed using the 2.5m du
Pont telescope at Las Campanas, Chile. Three fields of NGC 0247 were
surveyed in B, V, R, and I filters at the Cerro Tololo 4m telescope
during 1984 November to 1988 November. From the second through the
fourth year of the program, data were obtained in the
service-observing mode offered at Cerro Tololo Inter-American
Observatory (CTIO)
Beginning in 1990, the observing program for the Sculptor galaxies
shifted to the du Pont 2.5m telescope at the Las Campanas
Observatory. BVRI CCD observations covering the same three selected
fields were obtained in 1990 December, 1991 September, and 1992
October, November, and December.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 46 9 Positions for [MF09] Cepheids
lc.dat 28 559 BVRI light curves
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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- 15 A15 --- --- (NGC 0247:[MF09])
17- 18 A2 --- [MFC2009] Cepheid name, CN
20- 25 F6.3 d Per Period
27- 28 I2 h RAh Right ascension (J2000)
30- 31 I2 min RAm Right ascension (J2000)
33- 36 F4.1 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 46 I2 arcsec DEs Declination (J2000)
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Byte-by-byte Description of file: lc.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- [MFC2009] Cepheid name (CN)
4- 15 F12.4 d JD Julian date
17 A1 --- Band [BVRI] Band
19- 23 F5.2 mag mag Magnitude in band
25- 28 F4.2 mag e_mag rms uncertainty on mag
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Mar-2010