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J/A+A/464/953       Abundances of red giants in NGC 6441        (Gratton+, 2007)

Na-O anticorrelation and horizontal branches. V. The Na-O anticorrelation in NGC 6441 from Giraffe spectra. Gratton R.G., LucatelloS., Bragaglia A., Carretta E., Cassisi S., Momany Y., Pancino E., Valenti E., Caloi V., Claudi R., D'Antona F., Desidera S., Francois P., James G., Moehler S., Ortolani S., Pasquini L., Piotto G., Recio-Blanco A. <Astron. Astrophys. 464, 953 (2007)> =2007A&A...464..953G
ADC_Keywords: Clusters, globular ; Stars, population II ; Equivalent widths ; Radial velocities Keywords: stars: abundances - stars: atmospheres - stars: Population II - Galaxy: globular clusters: general - Galaxy: globular clusters: individual: NGC 6441 Abstract: We present an analysis of FLAMES-Giraffe spectra for several bright giants in NGC 6441, to investigate the presence and extent of the Na-O anticorrelation in this anomalous globular cluster. The field of NGC 6441 is very crowded, with severe contamination by foreground (mainly bulge) field stars. Appropriate membership criteria were devised to identify a group of 25 likely cluster members among the about 130 stars observed. Combined with the UVES data obtained with the same observations (Gratton et al., 2006, Cat. J/A+A/455/271), high dispersion abundance analyses are now available for a total of 30 stars in NGC 6441, 29 of them having data for both O and Na. The spectra were analyzed by a standard line analysis procedure; care was taken to minimize the impact of the differential interstellar reddening throughout the cluster, and to extract reliable information from crowded, and moderately high S/N (30-70), moderately high resolution (R∼23000) spectra. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 76 25 Photometry and spectroscopic data for stars observed with Giraffe table3.dat 38 2375 Equivalent Widths from Giraffe spectra
See also: J/A+A/455/271 : Abundances of red giants in NGC 6441 (Gratton+, 2006) J/A+A/464/927 : Abundances of red giants in NGC 6752 (Carreta+, 2007) J/A+A/464/939 : Abundances of red giants in NGC 6218 (Carreta+, 2007) J/A+A/464/967 : Abundances of red giants in NGC 6388 (Carreta+, 2007) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 I7 --- Star Sequential number of the star 9- 13 A5 --- Gratings [11+13 ] Grating(s) used 15- 22 F8.4 deg RAdeg Right ascension (J2000) in decimal degrees 24- 31 F8.4 deg DEdeg Declination (J2000) in decimal degrees 33- 35 I3 arcsec Dist Distance from the cluster center 37- 42 F6.3 mag Vmag Johnson V magnitude 44- 48 F5.3 mag V-Ic Johnson-Cousins V-Ic colour index 50- 54 F5.3 mag V-K ? Johnson V-K colour index 56- 59 F4.1 km/s RV Radial velocity 61- 62 I2 --- S/NHR11 ? HR11 signal-to-noise ratio 64- 65 I2 --- S/NHR13 ? HR13 signal-to-noise ratio 67- 70 F4.1 0.1pm e_EW rms uncertainty on equivalent width (mÅ) 72- 76 F5.2 [Sun] [Fe/H] Metallicity
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 I7 --- Star Sequential number of the star 9- 12 F4.1 --- Ion Element and ionisation stage, e.g. 26.1 = FeI 14- 20 F7.2 0.1nm Lambda Wavelength of the line 22- 25 F4.2 eV EP Potential energy 27- 32 F6.2 --- loggf Oscillator strength 34- 38 F5.1 0.1pm EW ? Equivalent width (mÅ)
Acknowledgements: Sara Lucatello, sara.lucatello(at) References: Carreta et al., Paper I, NGC 2808 2006A&A...450..523C Carreta et al., Paper II, NGC 6752 2007A&A...464..927C, Cat. J/A+A/464/927 Gratton et al., Paper III, NGC 6441 2006A&A...455..271G, Cat. J/A+A/455/271 Carreta et al., Paper IV, NGC 6218 2007A&A...464..939C, Cat. J/A+A/464/939 Carreta et al., Paper VI, NGC 6388 2007A&A...464..967C, Cat. J/A+A/464/967
(End) Patricia Vannier [CDS] 12-Mar-2007
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