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J/AcA/63/429  VI light curves of 10 variables in NGC288  (Arellano Ferro+, 2013)

Variable Stars in the Globular Cluster NGC 288: [Fe/H] and distance. Arellano Ferro A,, Bramich D.M., Giridhar S., Figuera Jaimes R., Kains N., Kuppuswamy K. <Acta Astron. 63, 429 (2013)> =2013AcA....63..429A
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD Keywords: globular clusters: individual: NGC 288 - stars: variables: RR Lyrae - stars: variables: delta Scuti Abstract: A search for variable stars in the globular cluster NGC 288 was carried out using a time-series of CCD images in the V and I filters. The photometry of all stellar sources in the field of view of our images, down to V∼19mag, was performed using difference image analysis (DIA). For stars of∼15mag, measurement accuracies of ∼8mmag and ∼10mmag were achieved for V and I respectively. Three independent search strategies were applied to the 5525 light curves but no new variables were found above the threshold limits characteristic of our data set. The use of older data from the literature combined with the present data allowed the refinement of the periods of all known variables. Fourier light curve decomposition was performed for the RRab and the RRc stars to obtain an estimate of [Fe/H]ZW=-1.62±0.02 (statistical) ±0.14 (systematic). A true distance modulus of 14.768±0.003mag (statistical) ±0.042mag (systematic), or a distance of 8.99±0.01kpc (statistical) ±0.17kpc (systematic) was calculated from the RRab star. The RRc star predicts a discrepant distance about one kiloparsec shorter but it is possibly a Blazhko variable. An independent distance from the P-L relationship for SX Phe stars leads to a distance of 8.9±0.3kpc. The SX Phe stars V5 and V9 are found to be double mode pulsators. Description: Standard and instrumental magnitudes in the Johnson-Kron Cousins V,I filters are listed for 10 variables in the globular cluster NGC 288. Epoch of mid-exposure and magnitude uncertainties are also listed. For completeness, also listed are the reference flux [ADU/s], the differential flux [ADU/s] and the photometric scale factor p(t), and their uncertainties. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 93 10 General data for all of the confirmed variables in NGC 288 in the FoV of our images table2.dat 80 3539 VI CCD photometry of variable stars in NGC 288
See also: J/A+AS/125/337 : New variables in NGC 288 (Kaluzny+ 1997) J/AJ/106/1024 : BV photometry in NGC 288 (Bergbusch 1993) J/AJ/122/2569 : VI photometry of NGC 288, 362 and 1851 (Bellazzini+, 2001) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Name Variable name <Cl* NGC 288 Saw VNN> in Simbad 5- 10 A6 --- Type Variable type (RRab/c, SR, SX Phe or E) 12- 17 F6.3 mag Vmag Johnson V magnitude 19- 24 F6.3 mag Imag ?=- Cousins I magnitude 26 A1 --- l_AV [~] Limit flag on AV 27- 31 F5.3 mag AV Amplitude in V band 33 A1 --- l_AI [~] Limit flag on AI 34- 37 F4.2 mag AI ?=- Amplitude in I band 39- 48 F10.8 d Per ?=- Period from this paper 50- 58 F9.4 d HJDmax Date of maximum (HJD-2450000) 59 A1 --- n_HJDmax [b] b: HJDmax contains time of minimum light 60- 68 F9.5 d Perl Period from literature 69 A1 --- n_Per [a] a: Period from Oosterhoff (1943BAN.....9..397O) 71- 72 I2 h RAh Right Ascension (J2000.0) 74- 75 I2 min RAm Right Ascension (J2000.0) 77- 81 F5.2 s RAs Right Ascension (J2000.0) 83 A1 --- DE- Declination sign (J2000.0) 84- 85 I2 deg DEd Declination (J2000.0) 87- 88 I2 arcmin DEm Declination (J2000.0) 90- 93 F4.1 arcsec DEs Declination (J2000.0)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Name Variable star number, VNN 5 A1 --- Flt [VI] Filter 7- 19 F13.5 d HJD Heliocentric Julian day 21- 26 F6.3 mag magstd Standard magnitude 28- 33 F6.3 mag maginst Instrumental magnitude 35- 39 F5.3 mag e_magstd Error on the magnitude 41- 49 F9.3 s-1 Fref Reference flux (in ADU/s) 51- 56 F6.3 s-1 e_Fref Error on the reference flux (in ADU/s) 58- 66 F9.3 s-1 DFlux Differential flux (in ADU/s) 68- 73 F6.3 s-1 e_DFlux Error on the differential flux (in ADU/s) 75- 80 F6.4 --- p Photometric scale factor
Acknowledgements: Armando Arellano Ferro, armando(at)astro.unam.mx References: Kaluzny, CCD photometry of NGC 288 variable stars, 1996A&AS..120...83K
(End) A. Arellano Ferro [IA-UNAM, Mexico], P. Vannier [CDS] 15-Jan-2014
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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