J/A+A/363/29 Variable stars in IC 1613 (Antonello+, 2000)
Variable stars in nearby galaxies.
III. White light observations of Field B of IC 1613.
Antonello E., Fugazza D., Mantegazza L., Bossi M., Covino S.
<Astron. Astrophys. 363, 29 (2000)>
=2000A&A...363...29A 2000A&A...363...29A
ADC_Keywords: Stars, variable ; Photometry
Keywords: stars: oscillations - stars: variables: Cepheids -
stars: variables: general - galaxies: individual: IC 1613 -
galaxies: Local Group - galaxies: stellar content
Abstract:
Two nearby galaxies, IC 1613 and NGC 6822, were observed over four
years to detect short period Cepheids and to obtain good light
curves for Fourier decomposition. Since the program was carried out
with a relatively small telescope, the Dutch 0.9-m at ESO-La Silla,
the observations were performed without filter (white light), or
Wh-band; the advantage of this technique is that the photon statistics
correspond to those of V-band observations of similar exposure time
obtained with a 2-m class telescope. In this paper we discuss
some properties of Wh photometry and present the results of the
observations of Field B in IC 1613 (3.8'x3.8'). A total of 65 images
were obtained and the reduction was performed with DAOPHOT. The light
curves of 4037 stars were measured, and the analysis using various
techniques allowed the detection of 121 variable stars. We detected 51
population I Cepheids, while previously only 12 Cepheids were known in
the same field. Most of these have short periods and some are first
overtone mode pulsators. The other variable stars include one
eclipsing binary, two suspected W Vir stars, 57 irregular and
semi-regular red variables, 3 periodic red variables and 6 irregular
blue variables.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 50 40 Cepheids in Field B of IC 1613
table9.dat 55 70 Other variable stars in Field B of IC 1613
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See also:
J/A+A/367/759 : Variable stars in IC 1613 (Mantegazza+, 2001)
Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [AFM2000] Variable name ([AFM2000] VNNNN-B, or
[AFM2000] VaNNNN-B in Simbad)
8 I1 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 17 F5.2 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20 I1 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 35 F6.3 d Per Period
37- 41 F5.2 mag Whmag White light (Wh) mean magnitude
43- 46 F4.2 mag Amp Total Wh amplitude
48- 49 A2 --- Mode [F12 ?] Probable pulsation mode (1)
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Note (1): Pulsation mode:
F: Fundamental pulsation mode
1: First pulsation mode
2: Second pulsation mode
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- [AFM2000] Variable name ([AFM2000] VNNNN-B in Simbad)
8 I1 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 17 F5.2 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20 I1 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 34 F5.2 mag Whmag White light (Wh) mean magnitude
36- 43 F8.3 d T Period for regular variables or the timescale
for the semiregular or irregular ones
45 A1 --- l_Amp Limit flag on Amp
46- 48 F3.1 mag Amp Total Wh amplitude
50- 51 A2 --- VarType Variability type (1)
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Note (1): Variability type:
LP: red irregular or long period variables
W: W Vir candidates
BV: blue variables
RP: red periodic variables
E: eclipsing binaries
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Table 10. Our designation of the variable stars detected
by Baade and by Sandage and falling in Field B
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Baade Sandage Present work Type
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SV1 V4540 Cep
SV3 Va2942 Cep
SV7 V4620 Cep
SV8 V4688 Irr
SV14 V0129 Cep
SV15 V3062 Cep
SV16 V4696 Cep
SV23 V2946 LC
SV30 V0926 Cep
SV34 V1274 Cep
SV37 V2952 Cep
SV53 V4004 Cep
SV60 V0358 Cep
SV61 V4552 Cep
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History:
From electronic version of the journal
References:
Antonello et al., Paper I 1999A&A...349...55A 1999A&A...349...55A
Antonello et al., Paper II 1999A&A...350..797A 1999A&A...350..797A
Mantegazza et al., Paper IV 2001A&A...367..759M 2001A&A...367..759M, Cat. J/A+A/367/759
(End) Patricia Bauer [CDS] 26-Jul-2001