J/AJ/123/840 VI photometry of variable stars in Fornax (Bersier+, 2002)
Variable stars in the Fornax dwarf galaxy.
Bersier D., Wood P.R.
<Astron. J. 123, 840 (2002)>
=2002AJ....123..840B 2002AJ....123..840B
ADC_Keywords: Stars, variable ; Photometry
Keywords: distance scale - galaxies: individual (Fornax) - RR Lyrae variable -
stars: variables: general
Abstract:
We present a search for variable stars in the Fornax dwarf galaxy
covering an area of half a square degree. We have ∼30 epochs of VI
data. We found and determined periods for more than 500 RR Lyrae,
17 anomalous Cepheids, and six Population II Cepheids. In addition we
have 85 candidate long-period variables, the majority of which were
previously unknown. We estimate that the average metal abundance of
RR Lyrae stars is [Fe/H]~=-1.6dex.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 25 132 Journal of observations
table2.dat 77 515 RR Lyrae variables
table3.dat 75 24 Anomalous Cepheids and Population II Cepheids
table4.dat 106 85 Candidate and known Long Period Variables
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- Field Field number (1)
3- 11 F9.5 d RJDV Reduced Julian date of V band observation (3)
13- 21 F9.5 d RJDIc Reduced Julian date of Ic band observation (3)
23- 25 A3 --- Obs Observatory code (2)
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Note (1): Field center as follows:
1 = RA 2:40:26.0 DE -34:28:40 (J2000)
2 = RA 2:38:40.0 DE -34:28:40 (J2000)
3 = RA 2:40:26.0 DE -34:50:00 (J2000)
4 = RA 2:38:40.0 DE -34:50:00 (J2000)
Note (2): Observatory code as follows:
MSO = Mount Stromlo Observatory
SSO = Siding Spring Observatory
Note (3): the paper does not specify in which year the observations were
made -- one can probably assume that the dates are JD-2450000
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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 --- --- [FBW]
5- 20 A16 --- FBW RR Lyrae name (FBW JHHMMSS.s+DDMMSS)
23- 24 I2 --- o_Vmag Number of observations used in Vmag
26- 31 F6.3 mag Vmag The phase-weighted V band magnitude
33- 37 F5.3 mag e_Vmag The uncertainty in Vmag
39- 40 I2 --- o_Icmag Number of observations used in Icmag
42- 47 F6.3 mag Icmag The phase-weighted Ic band magnitude
49- 53 F5.3 mag e_Icmag The uncertainty in Icmag
56- 61 F6.3 --- WS The Welch-Stetson (1993AJ....105.1813W 1993AJ....105.1813W)
variability index
64- 70 F7.5 d Period Pulsation period
73- 77 F5.3 mag E(B-V) The E(B-V) color excess
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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- 3 A3 --- --- [FBW]
5- 20 A16 --- FBW Cepheid name (FBW JHHMMSS.s+DDMMSS)
24- 29 F6.3 mag Vmag The phase-weighted V band magnitude
32- 36 F5.3 mag V-Ic The phase-weighted (V-Ic) color index
40- 44 F5.3 mag e_Vmag The uncertainty in Vmag
48- 52 F5.3 mag e_V-Ic The uncertainty in V-Ic
56- 60 F5.3 mag E(B-V) The E(B-V) color excess
63- 70 F8.5 d Per Pulsation period
72- 75 A4 --- Class Cepheid classification
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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- 3 A3 --- --- [FBW]
5- 20 A16 --- FBW Long Period Variable nam (FBW JHHMMSS.s+DDMMSS)
24- 25 I2 --- o_Vmag Number of observations used in Vmag
28- 33 F6.3 mag Vmag The arithmetic average V band magnitude
37- 41 F5.3 mag e_Vmag The average measurement error in Vmag
45- 46 I2 --- o_V-Ic Number of observations used in V-Ic
50- 54 F5.3 mag V-Ic The arithmetic averaged V-Ic color index
57- 61 F5.3 mag e_V-Ic The average measurement error in V-Ic
64- 68 F5.3 mag E(B-V) The E(B-V) color excess
72- 86 A15 --- OName Other identification (1)
88-106 A19 --- n_FBW Notes on FBW name (2)
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Note (1): Other identification:
S# = From Table 1 of Stetson et al., 1998, Cat. J/PASP/110/553,
[SHS98] NNN in Simbad
DK# = from Demers & Kunkel (1979PASP...91..761D 1979PASP...91..761D), DK NN
DI# = from Demers & Irwin (1987MNRAS.226..943D 1987MNRAS.226..943D), [DI87] VNN
Note (2): the question mark (?) means that the variability is not certain.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 25-Apr-2002