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J/MNRAS/452/727     NGC 6229 variable VI light curves    (Arellano Ferro+, 2015)

Revisiting the variable star population in NGC 6229 and the structure of the horizontal branch. Arellano Ferro A., Mancera Pina P.E., Bramich D.M., Giridhar S., Ahumada J.A., Kains N., Kuppuswamy K. <Mon. Not. R. Astron. Soc. 452, 727 (2015)> =2015MNRAS.452..727A (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry Keywords: globular clusters: individual: NGC 6229 - stars: variables: RR Lyrae Abstract: We report an analysis of new V and I CCD time series photometry of the distant globular cluster NGC 6229. The principal aims were to explore the field of the cluster in search of new variables, and to Fourier decompose the RR Lyrae light curves in pursuit of physical parameters. We found 25 new variables: 10 RRab, 5 RRc, 6 SR, 1 CW, 1 SX Phe, and 2 that we were unable to classify. Secular period changes were detected and measured in some favourable cases. The classifications of some of the known variables were rectified. The Fourier decomposition of RRab and RRc light curves was used to independently estimate the mean cluster value of [Fe/H] and distance. From the RRab stars we found [Fe/H]UVES =-1.31±0.01(statistical)±0.12(systematic) ([Fe/H]ZW=-1.42) and a distance of 30.0±1.5kpc, and from the RRc stars we found [Fe/H]UVES=-1.29±0.12 and a distance of 30.7±1.1kpc, respectively. Absolute magnitudes, radii and masses are also reported for individual RR Lyrae stars. Also discussed are the independent estimates of the cluster distance from the tip of the red giant branch, 34.9±2.4kpc and from the period-luminosity relation of SX Phe stars, 28.9±2.2kpc. The distribution of RR Lyrae stars in the horizontal branch shows a clear empirical border between stable fundamental and first overtone pulsators which has been noted in several other clusters; we interpret it as the red edge of the first overtone instability strip. Description: VI time-series photometry of known and newly discovered variable stars in NGC 6229. Objects: --------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------- 16 46 58.6. +47 31 36.4 NGC 6229 = GCl 47 --------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 115 73 General data for all of the confirmed variables in NGC 6229 in the FoV of our images (table 3) and positions of the 3 non-variable stars table4.dat 110 24 Fourier coefficients Ak for k = 0, 1, 2, 3, 4, and phases φ21, φ31 and φ41, for RRab and RRc stars. table5.dat 80 26 Physical parameters for the RRab and RRc stars table2.dat 79 50617 Time-series VI photometry of variables stars in NGC 6229
See also: J/ApJ/102/17 : NGC 6229 variable stars V light (Baade+, 1945) J/other/MmSAI/31.187 : Light curves of 12 variables in NGC 6229 (Mannino, 1960) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- VName Variable name (1) 5- 12 A8 --- VType Variable type (2) 14- 19 F6.3 mag <Vmag> ? Average V magnitude (3) 21- 26 F6.3 mag <Imag> ? Average I magnitude (3) 28- 31 F4.2 mag AmpV ?=- Amplitude in V band 33- 36 F4.2 mag AmpI ?=- Amplitude in I band 38- 47 F10.7 d Per ?=- Period 49- 54 F6.3 d/Myr beta ?=- Slope beta 56- 64 F9.4 d HJD ?=- Maximum brightness date (HJD-2450000) 66- 73 F8.5 d PerB ?=- Period from Borissova et al., 2001MNRAS.324...77B 75- 76 I2 h RAh Right ascension (J2000) 78- 79 I2 min RAm Right ascension (J2000) 81- 85 F5.2 s RAs Right ascension (J2000) 87 A1 --- DE- Declination sign (J2000) 88- 89 I2 deg DEd Declination (J2000) 91- 92 I2 arcmin DEm Declination (J2000) 94- 97 F4.1 arcsec DEs Declination (J2000) 99-115 A17 --- Note Note for non-variable stars
Note (1): Cl* NGC 6229 Saw VNNN in Simbad. Stars V49-V73 are new discoveries in this work. Note (2): Label 'Bl' is used for Blazhko variables. Note (3): The number of digits quoted for <Vmag> and <Imag> depend on the scatter and/or amplitude modulations seen in each light curve.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Type RR Lyrae type 6- 8 A3 --- VName Variable name 10- 15 F6.3 mag A0 A0 Fourier amplitude in Vmag 17- 21 F5.3 mag e_A0 rms uncertainty on A0 23- 27 F5.3 mag A1 A1 Fourier amplitude in Vmag 29- 33 F5.3 mag e_A1 rms uncertainty on A1 35- 39 F5.3 mag A2 A2 Fourier amplitude in Vmag 41- 45 F5.3 mag e_A2 rms uncertainty on A2 47- 51 F5.3 mag A3 A3 Fourier amplitude in Vmag 53- 57 F5.3 mag e_A3 rms uncertainty on A3 59- 63 F5.3 mag A4 A4 Fourier amplitude in Vmag 65- 69 F5.3 mag e_A4 rms uncertainty on A4 71- 75 F5.3 --- phi21 φ21 Fourier phase 77- 81 F5.3 --- e_phi21 rms uncertainty on phi21 83- 87 F5.3 --- phi31 φ31 Fourier phase 89- 93 F5.3 --- e_phi31 rms uncertainty on phi31 95- 99 F5.3 --- phi41 φ41 Fourier phase 101-105 F5.3 --- e_phi41 rms uncertainty on phi41 107-110 F4.1 --- Dm ?=- Deviation parameter
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Type RR Lyrae type 6- 8 A3 --- VName Variable name 9 A1 --- n_VName [ab] Note on Name (1) 10- 11 A2 --- Mean [WM ] WM when weighted mean of the RR Lyrae type for the following values 13- 18 F6.3 [-] [Fe/H] ?=- UVES metallicity 20- 24 F5.3 [-] e_[Fe/H] ? rms uncertainty on [Fe/H] 26- 30 F5.3 mag VMAG ?=- Absolute V magnitude 32- 36 F5.3 mag e_VMAG ? rms uncertainty on Vmag 38- 42 F5.3 [K] logTeff Effective temperature 44- 48 F5.3 [K] e_logTeff ? rms uncertainty on Teff 50- 54 F5.3 [Lsun] logL ?=- Luminosity 56- 60 F5.3 [Lsun] e_logL ? rms uncertainty on logL 62- 65 F4.2 Msun Mass ?=- Mass 67- 70 F4.2 Msun e_Mass ?=- rms uncertainty on Mass 72- 75 F4.2 Rsun R ?=- Radius 77- 80 F4.2 Rsun e_R ?=- rms uncertainty on R
Note (1): Notes as follows: a = No [Fe/H] estimate since Dm>4.1. V36 has a very peculiar value of phi31 b = No MV estimate since star falls off the HB
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- VName Variable name, VNN 5 A1 --- Filt [VI] Observation filter 7- 19 F13.5 d HJD Heliocentric Julian date 21- 26 F6.3 mag magst Standard magnitude 28- 33 F6.3 mag maginst Instrumental magnitude 35- 39 F5.3 mag e_maginst Error on the magnitude 41- 49 F9.3 s-1 Fref Reference flux (in ADU/s) 51- 55 F5.3 s-1 e_Fref Error on the reference flux (in ADU/s) 57- 65 F9.3 s-1 Fdiff Differential flux (in ADU/s) 67- 72 F6.3 s-1 e_Fdiff Error on the differential flux (in ADU/s) 74- 79 F6.4 --- p [0.1094/1.0148] Photometric scale factor
Acknowledgements: Armando Arellano Ferro, armando(at)astro.unam.mx History: * 14-Sep-2015: First on-line version * 21-Jan-2016: tables 4 and 5 added (from electronic version) * 15-Feb-2016: table5: uncertainties on mass corrected
(End) Armando Arelano Ferro [IA-UNAM Mexico], Patricia Vannier [CDS] 11-Sep-2015
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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