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J/A+A/440/901       Reddening and metallicity of NGC 6752        (Gratton, 2005)

Precise reddening and metallicity of NGC 6752 from FLAMES spectra. Gratton R.G., Bragaglia A., Carretta E., De Angeli F., Lucatello S., Momany Y., Piotto G., Recio Blanco A. <Astron. Astrophys. 440, 901 (2005)> =2005A&A...440..901G
ADC_Keywords: Clusters, globular ; Photometry, UBV ; Abundances ; Reddening ; Effective temperatures ; Radial velocities ; Equivalent widths Keywords: stars: abundances - stars: evolution - stars: Population II - Galaxy: globular clusters: general - Galaxy: formation Abstract: Accurate reddenings for Globular Clusters could be obtained by comparing the colour-temperature obtained using temperatures from reddening-free indicator (Hα), with that given by standard colour-temperature calibrations. The large multiplexing opportunity offered by FLAMES at VLT2 allowed us to obtain spectra centered on Hα at a resolution of R=6000 and 5<S/N<50 for 120 stars near the turn-off of NGC 6752 with GIRAFFE from a single 1300 seconds exposure on June 24th, 2004. Description: Table 3 contains the relative flux in the bands around Hα measured on FLAMES GIRAFFE spectra of about 120 stars near the Turn-Off of NGC 6752. Table 4 contains V magnitudes, B-V colours, effective temperatures (derived from the wings of the Hα lines), and reddenings E(B-V) from the same stars. Table 7 contains the equivalent widths measured on UVES spectra of seven stars at the RGB bump of NGC 6752, used to derive precise metal abundances for the cluster. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 19 10 51.8 -59 58 55 NGC 6752 = GCl 108 = C 1906-600 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 66 120 S/N ratios, heliocentric radial velocities and normalized fluxes for the target stars table4.dat 34 120 Temperatures and reddenings table7.dat 68 65 Equivalent widths from UVES spectra
See also: J/ApJS/99/637 : Equivalent widths for 54 red giants (Norris+ 1995) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq Sequential number of the star 8- 9 I2 --- S/N Signal-to-noise ratio 12- 16 F5.1 km/s HRV Heliocentric radial Velocity 18- 23 F6.3 --- Flux3 Normalized flux in band 3, 6547.8-6552.8Å 25- 30 F6.3 --- Flux4 Normalized flux in band 4, 6552.8-6557.8Å 32- 37 F6.3 --- Flux5 Normalized flux in band 5, 6557.8-6562.8Å 39- 44 F6.3 --- Flux6 Normalized flux in band 6, 6562.8-6567.8Å 46- 51 F6.3 --- Flux7 Normalized flux in band 7, 6567.8-6572.8Å 53- 58 F6.3 --- Flux8 Normalized flux in band 8, 6572.8-6577.8Å 60- 65 F6.3 --- <Flux5,6> Average of fluxes in bands 5 and 6
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq Sequential number of the star 8- 13 F6.3 mag Vmag V magnitude 16- 20 F5.3 mag B-V B-V colour index 22- 25 I4 K Teff Effective Temperature 28- 33 F6.3 mag E(B-V) Reddening
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 4 F4.1 --- El Element 6- 12 F7.2 0.1nm Lambda Line Wavelength 15- 18 F4.2 eV EP Excitation Potential 21- 25 F5.2 --- loggf log Oscillator Strength 27- 31 F5.1 0.1pm EW25072 ? Equivalent width for star 25072 33- 37 F5.1 0.1pm EW26529 ? Equivalent width for star 26529 39- 43 F5.1 0.1pm EW30409 ? Equivalent width for star 30409 45- 49 F5.1 0.1pm EW30426 ? Equivalent width for star 30426 51- 55 F5.1 0.1pm EW34854 ? Equivalent width for star 34854 57- 61 F5.1 0.1pm EW37999 ? Equivalent width for star 37999 63 A1 --- l_EW39672 Limit flag on EW39672 64- 68 F5.1 0.1pm EW39672 ? Equivalent width for star 39672
Acknowledgements: Raffaele Gratton, gratton(at)pd.astro.it Remarks: the paper indicates the existence of an accurate astrometry, but it has not been possible to get it from any of the authors.
(End) Patricia Vannier [CDS] 10-Jun-2005
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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