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J/A+A/539/A157         Li and Na in globular cluster M4      (Monaco+, 2012)

Lithium and sodium in the globular cluster M 4. Detection of a Li-rich dwarf star: preservation or pollution? Monaco L., Villanova S., Bonifacio P., Caffau E., Geisler D., Marconi G., Momany Y., Ludwig H.-G. <Astron. Astrophys., 539, A157 (2012)> =2012A&A...539A.157M
ADC_Keywords: Clusters, globular; Stars, dwarfs ; Abundances Keywords: nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: Population II - galaxies: abundances - globular clusters: individual: M4 - cosmology: observations Abstract: The abundance inhomogeneities of light elements observed in globular clusters (GCs), and notably the ubiquitous Na-O anti-correlation, are generally interpreted as evidence that GCs comprise several generations of stars. There is an on-going debate as to the nature of the stars, which produce the inhomogeneous elements, and investigating the behavior of several elements is a way to shed new light on this problem. We aim at investigating the Li and Na content of the GC M4, that is known to have a well defined Na-O anti-correlation. We obtained moderate resolution (R=17000-18700) spectra for 91 main sequence (MS)/sub-giant branch stars of M4 with the Giraffe spectrograph at the FLAMES/VLT ESO facility. Using model atmospheres analysis we measured lithium and sodium abundances. Description: We observed stars along the M4 MS and SGB using the FLAMES/GIRAFFE spectrograph at ESO Paranal. Observations were conducted in service mode between April and July 2010 using the HR12 and HR15N settings. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 68 91 Basic data for MS/SGB stars studied in this paper
See also: J/ApJ/443/124 : Radial Velocities of Stars in M4 (Peterson+ 1995) J/PAZh/22/847 : Identification and coordinates in M4 (Shokin+, 1996) J/AJ/114/189 : M4 CCD photometry (Alcaino+, 1997) J/ApJS/120/265 : HST photometry of M4 (Ibata+, 1999) J/AJ/124/1486 : M4 UBV color-magnitude diagrams (Mochejska+, 2002) J/AJ/127/2771 : HST proper-motions of M4 main-sequence stars (Richer+, 2004) J/ApJ/689/1031 : Heavy element abundances in giant stars (Yong+, 2008) J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008) J/MNRAS/412/81 : Lithium abundance in M4 red giants (Mucciarelli+, 2011) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq Sequential number 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 17 F5.2 s RAs Right ascension (J2000) 19 A1 --- DE- Declination sign (J2000) 20- 21 I2 deg DEd Declination (J2000) 23- 24 I2 arcmin DEm Declination (J2000) 26- 30 F5.2 arcsec DEs Declination (J2000) 32- 35 I4 K Teff Effective temperature 37- 40 F4.2 [cm/s2] logg Surface gravity 42- 45 F4.2 km/s xi Turbulent velocity ξ 47- 50 F4.2 [-] A(Fe) [6.12/6.36] Fe abundance 52- 55 F4.2 [-] A(Na) [4.94/5.52] Na abundance 57- 60 F4.2 [-] A(Li) [0.86/2.87] Li abundance 62- 64 I3 0.1pm EW(Li) [8/114] Li equivalent width 66- 68 I3 --- S/N Spectral signal-to-noise at the lithium line
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 29-May-2012
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