J/MNRAS/372/1657 BVI(c) light curves of variables in M3 (Benko+, 2006)
Multicolour CCD photometry of the variable stars in globular cluster M3.
Benko J.M., Bakos G.A., Nuspl J.
<Mon. Not. R. Astron. Soc., 372, 1657-1674 (2006)>
=2006MNRAS.372.1657B 2006MNRAS.372.1657B
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD
Keywords: techniques: photometric - stars: individual: RR Lyrae -
stars: variables: other - globular clusters: individual: M3
Abstract:
We present time-series data on the variable stars of the galactic
globular cluster Messier 3 (M3). We give BVIC light curves for 226
RR Lyrae, 2 SX Phe and 1 W Vir type variables, along with estimated
fundamental photometric parameters such as intensity and
magnitude-averaged brightness and pulsation periods. In some cases,
the periods we have found significantly differ from the previously
published ones. This is the first published light curve and period
determination for variable V266. The I-band light curve has not been
observed previously for numerous (76) variables. Three new RR Lyrae
variables have been discovered. Groups of RR Lyrae variables that
belong to different evolutionary stages and have been separated
previously on the basis of V data were found here for all colours and
colour indices by cluster analysis. The I-band period-luminosity
relation is also discussed. From the 66 modulated (Blazhko type) RR
Lyrae stars we investigated, six are newly identified and two of them
are first overtone pulsators. In the case of 13 RR Lyrae, the period
of Blazhko cycle has been estimated for the first time. V252 is
identified as a new RRd variable. Amplitude ratios of RRd stars have
been investigated to search possible mode content changes. In contrast
to previous publications no changes have been found. Problems with the
sampling of the time-series of typical cluster variability surveys are
demonstrated.
Description:
The observational material of M3 was obtained in two seasons (1998 and
1999) with two telescopes. Both telescopes are mounted at Piszkestet
Mountain Station of the Konkoly Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 109 237 The basic parameters of the variables in M3
bmag/* . 230 Individual B light curves
vmag/* . 233 Individual V light curves
imag/* . 223 Individual I light curves
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See also:
I/278 : Catalog of stars in M3 (von Zeipel, 1908)
J/A+A/290/69 : M3 photographic photometry (Buonanno+, 1994)
J/A+A/320/757 : M3 stars CCD photometry (Ferraro+ 1997)
J/A+A/324/915 : Blue stragglers in M3 (Ferraro+ 1997)
J/AJ/108/1786 : Blue stragglers + variable stars in M3 (Guhathakurta+, 1994)
J/AJ/120/1364 : Abundances in M3 and M13 (Cavallo+, 2000)
J/AJ/122/3219 : M3 and M13 CCD BV photometry (Rey+, 2001)
J/AJ/129/267 : RR Lyrae variables in NGC 5272 (Cacciari+, 2005)
J/AJ/129/303 : Abundances of stars in M3 and M13 (Cohen+, 2005)
J/AJ/129/1596 : BVI photometric variability survey of M3 (Hartman+, 2005)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Seq Sequential number (1)
4 A1 --- m_Seq Multiplitity index on Seq
6- 18 F13.9 d Per ? Period
19 A1 --- u_Per [?] Uncertainty flag on Per
21- 26 A6 --- Type Type of variable
28- 33 F6.3 mag Bmag ? Magnitude-averaged mean Johnson B brightness
34 A1 --- u_Bmag Uncertainty flag on Bmagb
36- 41 F6.3 mag <Bmag> ? Intensity mean Johnson B magnitude
42 A1 --- u_<Bmag> Uncertainty flag on <Bmag>
44- 49 F6.3 mag Vmag ? Magnitude-averaged mean Johnson V brightness
50 A1 --- u_Vmag Uncertainty flag on Vmagb
52- 57 F6.3 mag <Vmag> ? Intensity mean Johnson V magnitude
58 A1 --- u_<Vmag> Uncertainty flag on <Vmag>
60- 65 F6.3 mag Imag ? Magnitude-averaged mean Cousins I brightness
66 A1 --- u_Imag Uncertainty flag on Imagb
68- 73 F6.3 mag <Imag> ? Intensity mean Cousins I magnitude
74 A1 --- u_<Imag> Uncertainty flag on <Imag>
76- 77 A2 --- n_Bmag [ARS: ] Type of magnitude transformation for
B band (2)
78- 79 A2 --- n_Vmag [ARS: ] Type of magnitude transformation for
V band (2)
80- 81 A2 --- n_Imag [ARS: ] Type of magnitude transformation for
I band (2)
82-101 A20 --- Com Comments
103-109 A7 --- FileName Name of the light curve files (3)
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Note (1): Nomeclature note:
NNN = Cl* NGC 5272 SAW VNNNw ( 1 to 274)
NN = Cl* NGC 5272 BBN AN (N1, N2, N3)
Note (2): Type of magnitude transformation as follows:
A = The brightness of stars was determined first by using the
aperture photometry task DAOPHOT/PHOT of IRAF. This method
provides robust flux estimates with small errors for isolated
stars and was used for variables that lie in the outer parts
of Schmidt frames.
R = The ISM method gives differential fluxes of objects with respect
to their fluxes measured on the reference frame. For the
instrumental magnitudes, we need to determine the magnitudes and
fluxes for each variable in the reference frames as accurately
as possible. To get these zero-points, we performed PSF
photometry using IRAF/DAOPHOT with variable PSF for the
photometric reference images (one for each colour and camera).
The zero-points were derived from the RCC telescope's data.
S = The ISM method gives differential fluxes of objects with respect
to their fluxes measured on the reference frame. For the
instrumental magnitudes, we need to determine the magnitudes and
fluxes for each variable in the reference frames as accurately
as possible. To get these zero-points, we performed PSF
photometry using IRAF/DAOPHOT with variable PSF for the
photometric reference images (one for each colour and camera).
The zero-points were derived from the Schmidt frames.
Note (3): The light-curve file names are:
B band = bmag/FileName.b
V band = vmag/FileName.v
I band = imag/FileName.i
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Byte-by-byte Description of file: bmag/* vmag/* imag/*
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Bytes Format Units Label Explanations
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1- 16 F16.8 d HJD Heliocentric Julian date
18- 34 F17.14 mag mag magnitude
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Aug-2007