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J/ApJ/559/1060      Variables in 47 Tuc                      (Albrow+, 2001)

The frequency of binary stars in the core of 47 Tucanae. Albrow M.D., Gilliland R.L., Brown T.M., Edmonds P.D., Guhathakurta P., Sarajedini A. <Astrophys. J. 559, 1060 (2001)> =2001ApJ...559.1060A
ADC_Keywords: Clusters, globular ; Stars, variable ; Binaries, eclipsing ; Photometry Keywords: binaries: eclipsing - binaries: general - globular clusters: individual (NGC 104, 47 Tucanae) Abstract: Differential time series photometry has been derived for 46,422 main-sequence stars in the core of 47 Tucanae. The observations consisted of near-continuous 160 s exposures alternating between the F555W and F814W filters for 8.3 days in 1999 July with the Wide Field Planetary Camera 2 on the Hubble Space Telescope. Using Fourier and other search methods, 11 detached eclipsing binaries and 15 W Ursa Majoris stars have been discovered plus an additional 10 contact or near-contact noneclipsing systems. After correction for nonuniform area coverage of the survey, the observed frequencies of detached eclipsing binaries and W UMa stars within 90" of the cluster center are 0.022% and 0.031%, respectively. The data were taken over an 8.3 day period, 1999 July 3-11, during which HST was pointed continuously at 47 Tuc. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tables.dat 95 141 HST photometry of 47 Tuc variables (tables 1-8 of the publication)
See also: J/other/Sci/292.2290 : Chandra compact binaries in 47 Tuc (Grindlay+, 2001) J/ApJS/85/293 : HST Observations of core of 47 Tuc (de Marchi+ 1993) J/A+A/315/40 : Photometry of the Tuc dwarf galaxy (Saviane, 1996) J/A+AS/128/19 : Variable stars in 47 Tuc fields 104A-E (Kaluzny+ 1998) Byte-by-byte Description of file: tables.dat
Bytes Format Units Label Explanations
1 I1 --- TNO Type of variable (1) 3- 9 A7 --- VName Star variable name (2) 11 A1 --- l_Per Limit flag on Per 12- 18 F7.4 d Per ? Period 20- 25 F6.3 d Epoch ? Epoch of the primary minimum, HJD-2451300 (only for eclipsing binaries) 27- 31 F5.3 mag AV ? V-band semi-amplitude (only for BY Draconis and red straggler variables) 33- 38 F6.3 mag Vmag V magnitude 40- 45 F6.3 mag U-V ? U-V colour index 47- 52 F6.3 mag V-I ? V-I colour index 54- 55 I2 h RAh Right ascension (J2000) (3) 57- 58 I2 min RAm Right ascension (J2000) (3) 60- 66 F7.4 s RAs Right ascension (J2000) (3) 70 A1 --- DE- Declination sign (J2000) (3) 71- 72 I2 deg DEd Declination (J2000) (3) 74- 75 I2 arcmin DEm Declination (J2000) (3) 77- 82 F6.3 arcsec DEs Declination (J2000) (3) 84- 95 A12 --- Class Classification
Note (1): Type of variables as follows: 1 = Eclipsing Binaries 2 = W UMa Binaries 3 = Non-eclipsing Contact and Semi-detached Binaries 4 = BY Draconis Variables 5 = Red Straggler Variables 6 = Other Variables 7 = Variable Giants 8 = Variable RGB-AGB stars Note (2): Star variable name as AAA-VNN, where AAA is the HST chip (PC1, WF2, WF3 or WF4) and VNN the variable number in the field. Simbad nomenclature as follows: PC1-VNN = Cl* NGC 104 EGG VNN WFN-VNN = Cl* NGC 104 AGBWF N-NN Note (3): Coordinates calculated using the STSDAS task METRIC and archival image u5jm070cr.
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 24-Apr-2002
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