J/AJ/134/594 Araucaria project: Cepheids in WLM galaxy (Pietrzynski+, 2007)
The Araucaria project: the distance to the Local Group galaxy WLM from Cepheid
variables discovered in a wide-field imaging survey.
Pietrzynski G., Gieren W., Udalski A., Soszynski I., Bresolin F.,
Kudritzki R.-P., Garcia A., Minniti D., Mennickent R., Szewczyk O.,
Szymanski M., Kubiak M., Wyrzykowski L.
<Astron. J., 134, 594-603 (2007)>
=2007AJ....134..594P 2007AJ....134..594P
ADC_Keywords: Galaxies, nearby ; Stars, variable ; Photometry, VRI
Keywords: Cepheids - distance scale - galaxies: distances and redshifts -
galaxies: individual (WLM) - galaxies: stellar content
Abstract:
We have conducted an extensive wide-field imaging survey for Cepheid
variables in the Local Group irregular galaxy WLM. From data obtained
on 101 nights, we have discovered 60 Cepheids, which include 14 of the
15 Cepheid variables previously detected by Sandage and Carlson. Our
Cepheid survey in WLM should be practically complete down to a period
of 3-days. Importantly, we have found for the first time a long-period
Cepheid (P=54.2-days) in this galaxy, alleviating the problem that
WLM with its many blue, massive stars does not contain Cepheids with
periods longer than about 10-days.
Description:
All the data presented in this paper were collected with the Warsaw
1.3m telescope at Las Campanas Observatory. The V images of WLM were
secured on 101 different nights between 2001 December and 2003
December. In addition, 24 I-band images were collected in 2003.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 78 60 Cepheids in WLM
table2.dat 35 2837 Individual V and I Observations
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See also:
J/AJ/128/2815 : Araucaria: NGC 6822 Cepheid variables (Pietrzynski+, 2004)
J/A+A/450/873 : Araucaria: NGC 6822 bright variables (Mennickent+, 2006)
J/AJ/123/789 : Araucaria: NGC 300 Cepheid variables (Pietrzynski+, 2002)
J/AJ/128/1167 : Araucaria: NGC 300 Cepheid Variables. II (Gieren+, 2004)
J/MNRAS/350/679 : Araucaria: NGC 300 variables BV phot. (Mennickent+, 2004)
J/ApJ/648/366 : Araucaria: NGC 3109 Cepheids VI phot. (Pietrzynski+, 2006)
J/ApJ/648/375 : Araucaria: NGC 3109 Cepheids JK phot. (Soszynski+, 2006)
J/A+A/485/41 : Araucaria: NGC 55 blue massive stars (Castro+, 2008)
J/ApJ/672/266 : Araucaria: NGC 55 Cepheids JK magnitudes (Gieren+, 2008)
J/ApJ/521/577 : HST studies of the WLM globular cluster (Hodge+, 1999)
J/A+A/416/111 : C stars in Wolf-Lundmark-Melotte galaxy (Battinelli+, 2004)
J/A+A/466/501 : JKs photometry of WLM galaxy carbon stars (Valcheva+, 2007)
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- 5 I02 --- cep Cepheid identification ([PGU2007] cepNN)
7 I1 h RAh Hour of Right Ascension (J2000)
9- 10 I2 min RAm Minute of Right Ascension (J2000)
12- 16 F5.2 s RAs Second of Right Ascension (J2000)
18 A1 --- DE- Sign of the Declination (J2000)
19- 20 I2 deg DEd Degree of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 37 F8.5 d Per Period
39- 51 F13.5 d T0 JD of maximum brightness in the V band
53- 58 F6.3 mag <Vmag> Mean V band intensity magnitude
60- 65 F6.3 mag <Imag> ? Mean I band intensity magnitude
67- 72 F6.3 mag <WImag> ? Mean Wesenheit band intensity magnitude,
defined as WI=I-1.55(V-I)
74- 78 A5 --- Rem Additional remark (1)
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Note (1): Entries beginning with "V" give the Cepheid identifications of
Sandage and Carlson (1985AJ.....90.1464S 1985AJ.....90.1464S, [SC85b] VNN in Simbad).
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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- 5 I02 --- cep Cepheid identification ([PGU2007] cepNN)
7 A1 --- Filt [VI] Filter used in the observation
9- 22 F14.6 d JD Julian date of the observation
24- 29 F6.3 mag mag Observed magnitude in Filt
31- 35 F5.3 mag e_mag The 1σ uncertainty in mag
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 14-Sep-2009