J/AJ/123/789 ARAUCARIA project: NGC 300 Cepheid variables (Pietrzynski+, 2002)
The ARAUCARIA project: discovery of Cepheid variables in NGC 300 from a
wide-field imaging survey.
Pietrzynski G., Gieren W., Fouque P., Pont F.
<Astron. J. 123, 789 (2002)>
=2002AJ....123..789P 2002AJ....123..789P
ADC_Keywords: Stars, variable ; Photometry, UBV
Keywords: Cepheids - galaxies: distances and redshifts -
galaxies: individual (NGC 300) - galaxies: stellar content
Abstract:
We have conducted a survey for Cepheid variables in the Sculptor group
spiral NGC 300. Based on observations obtained with the Wide-Field
Camera at the 2.2m ESO/MPI telescope at the La Silla observatory in
Chile during 29 nights spread over a 5.3 month interval. The telescope
was equipped with the ESO mosaic Wide-Field Camera (WFI) consisting of
eight 2048x4098 pixel arrays. The CCDs were separated by gaps of
23.8" and 14.3" in right ascension and declination, respectively. The
total field of view was about 34'x33' with a scale of 0.238"/pixel.
117 Cepheids and 12 Cepheid candidates were found, which cover the
period range from 115 to 5.4 days. We present a catalog that provides
equatorial coordinates, period, time of maximum brightness, and
intensity mean B and V magnitudes for each variable, and we show
phased B and V light curves for all the Cepheids found. We also
present the individual B and V observations for each Cepheid in our
catalog. During our search we rediscovered all 18 previously known
Cepheids and confirmed the Cepheid nature of three Cepheid candidates
from the previous photographic survey of Graham (1984AJ.....89.1332G 1984AJ.....89.1332G).
Star V4 in Graham's list (1984AJ.....89.1332G 1984AJ.....89.1332G), classified by him as
an eclipsing binary, turns out to be another Cepheid. We find very
good agreement between our photometry and that obtained by Freedman et
al. (1992ApJ...396...80F 1992ApJ...396...80F) from ground-based CCD data for common stars.
Using the earlier data together with our new data, we were able to
significantly improve the periods for 15 Cepheids in our sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 26 58 Journal of observations
table2.dat 78 117 Cepheids in NGC 300
table3.dat 72 12 Cepheid candidates in NGC 300
table4.dat 38 5020 Individual B and V Observations
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See also:
J/AJ/128/1167 : ARAUCARIA project: NGC 300 Cepheids. II. (Pietrzynski+, 2002)
J/MNRAS/350/679 : BV photometry of NGC 300 variables (Mennickent+, 2004)
J/AJ/128/2815 : ARAUCARIA project: NGC 6822 Cepheids (Pietrzynski+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "YYYY/MM/DD" Date Observation date
13 A1 --- Filt [BV] Filter
16- 26 F11.3 d HJD Heliocentric Julian date of the observation
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [PGF2002] Cepheid identification number (CepNNN)
8 I1 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- Sign of the Declination (J2000)
20- 21 I2 deg DEd Degree of Declination (J2000)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000)
26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000)
31- 37 F7.3 d Per Derived pulsation period
39- 49 F11.3 d HJD Heliocentric Julian date of zero phase (1)
51- 55 F5.2 mag Bmag The intensity mean B band magnitude
57- 61 F5.2 mag Vmag The intensity mean V band magnitude
63- 65 A3 --- [G84] Gramham (1984AJ.....89.1332G 1984AJ.....89.1332G) variable name
(VNN here, [G84] NN in Simbad)
68- 72 A5 --- Rem Remark
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Note (1): Corresponding to maximum light in the V band.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [PGF2002] Cepheid identification number (CepNNN)
9 A1 --- Filt [BV] Filter
12- 22 F11.3 d HJD Heliocentric Julian date
25- 30 F6.3 mag mag The Filt band magnitude
34- 38 F5.3 mag e_mag The uncertainty in mag
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 30-May-2002