J/other/RMxAA/50.307 RR Lyr light curves in NGC 3201 (Arellano Ferro+, 2014)
Fourier decomposition of RR Lyrae light curves and the SX Phe population in the
central region of NGC 3201.
Arellano Ferro A., Ahumada J.A., Calderon J.H., Kains N.
<Rev. Mex. Astron. Astrofis., 50, 307-322 (2014)>
=2014RMxAA..50..307A 2014RMxAA..50..307A
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD
Keywords: globular clusters: individual: NGC 3201 -
stars: variables: RR Lyrae
Abstract:
CCD time-series observations of the central region of the globular
cluster NGC 3201 were obtained with the aim of performing the Fourier
decomposition of the light curves of the RR Lyrae stars present in
that field. This procedure gave the mean values, for the metallicity,
of [Fe/H]ZW=-1.483±0.006 (statistical) ±0.090 (systematical),
and for the distance, 5.000±0.001kpc (statistical) ±0.220
(systematical). The values found from two RRc stars are consistent
with those derived previously. The differential reddening of the
cluster was investigated and individual reddenings for the RR Lyrae
stars were estimated from their V-I curves. We found an average value
of E(B-V)=0.23±0.02. An investigation of the light curves of stars
in the blue stragglers region led to the discovery of three new SX Phe
stars. The period-luminosity relation of the SX Phe stars was used for
an independent determination of the distance to the cluster and of the
individual reddenings. We found a distance of 5.0kpc
Description:
V and I time-series photometry for all confirmed variables in the
central region of the golbular cluster NGC 3201.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 50 General data for all of the confirmed variables
in NGC 3201 in the field of view of our images
table5.dat 82 14319 VI photometry of 34 RR Lyrae, 14 SX Phe, 1 SR
and 1 eclipsing binary in NGC 3201
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See also:
J/PAZh/22/269 : Giant branch and variable stars in NGC 3201 (Samus+, 1996)
J/AJ/123/279 : VI Photometry and Variables in NGC 3201 (von Braun+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- VName Variable name, V1 to V124,
<Cl* NGC 3201 SAW VNNN> in Simbad
5 A1 --- n_VName [a] "a" indicates newly found stars
7- 14 A8 --- VType Variable type ("Bl" for Blazhko effect)
16- 21 F6.3 mag <Vmag> ?=- Mean V magnitude
23- 28 F6.3 mag <Imag> ?=- Mean I magnitude
30- 34 F5.3 mag AV ?=- Absorption in V band
35 A1 --- --- [-]
36- 39 F4.2 mag AV2 ? Upper value of absorption in V band
when interval
41- 45 F5.3 mag AI ?=- Absorption in V band
46 A1 --- --- [-]
47- 50 F4.2 mag AI2 ? Upper value of absorption in I band
when interval
52- 60 F9.7 d Plit ?=- Period from literature
(Layden & Sarajedini, 2003AJ....125..208L 2003AJ....125..208L)
62- 70 F9.4 d T0 ?=- Time of maximum light (HJD-2450000)
72- 79 F8.6 d Per ?=- This work period
81- 82 I2 10-6d e_Per [3/97]? rms uncertainty on Per
85- 86 I2 h RAh Right ascension (J2000)
88- 89 I2 min RAm Right ascension (J2000)
91- 95 F5.2 s RAs Right ascension (J2000)
97 A1 --- DE- Declination sign (J2000)
98- 99 I2 deg DEd Declination (J2000)
101-102 I2 arcmin DEm Declination (J2000)
104-107 F4.1 arcsec DEs Declination (J2000)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- VName Variable name, VNN
6 A1 --- Fltr [VI] Observation filter
8- 20 F13.5 d HJD Heliocentric Julian date
22- 27 F6.3 mag magst Standard magnitude
29- 34 F6.3 mag maginst Instrumental magnitude
36- 40 F5.3 mag e_maginst Error on the magnitude
42- 51 F10.3 s-1 Fref Reference flux (in ADU/s)
53- 58 F6.3 s-1 e_Fref Error on the reference flux (in ADU/s)
60- 68 F9.3 s-1 Fdif Differential flux (in ADU/s)
70- 75 F6.3 s-1 e_Fdif Error on the differential flux (in ADU/s)
77- 82 F6.4 --- p [0.13/1.07] Photometric scale factor
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Acknowledgements:
Armando Arellano Ferro, armando(at)astro.unam.mx
References:
Layden et al., 2003AJ....125..208L 2003AJ....125..208L,
Photometry of the globular cluster NGC 3201 and its variable stars
Mazur et al., 2003MNRAS.340.1205M 2003MNRAS.340.1205M,
Variable stars in the globular cluster NGC 3201. I.
(End) Armando Arelano Ferro [IA-UNAM Mexico], Patricia Vannier [CDS] 13-Jun-2014