Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/716/L166      Lithium abundances in red giants of M4      (D'Orazi+, 2010)

Lithium abundances in red giants of M4: evidence for asymptotic giant branch star pollution in globular clusters? D'Orazi V., Marino A.F. <Astrophys. J., 716, L166-L169 (2010)> =2010ApJ...716L.166D
ADC_Keywords: Clusters, globular ; Abundances ; Stars, giant Keywords: globular clusters: individual (NGC 6121) - stars: abundances - stars: individual (Population II) Abstract: The determination of Li and proton-capture element abundances in globular cluster (GC) giants allows us to constrain several key questions on the multiple population scenarios in GCs, from formation and early evolution to pollution and dilution mechanisms. In this Letter, we present our results on Li abundances for a large sample of giants in the intermediate-metallicity GC NGC 6121 (M4), for which Na and O have been already determined by Marino et al. (2008, Cat. J/A+A/490/625). The stars analyzed are both below and above the red giant branch bump luminosity. We found that the first and second generation stars share the same Li content, suggesting that a Li production must have occurred. This provides strong observational evidence supporting the scenario in which asymptotic giant branch stars are GC polluters. Description: Our sample consists of 104 RGB stars, whose spectra were acquired with FLAMES on VLT/UT2 with the fiber link to the high-resolution spectrograph UVES (R∼40000). A detailed description of observations, target properties, and data reduction and derivation of atmospheric parameters is provided in Marino et al. (2008, Cat. J/A+A/490/625). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 44 104 Stellar parameters and abundances for our sample stars
See also: J/A+A/539/A157 : Lithium and sodium in M4 (Monaco+, 2012) J/MNRAS/412/81 : Lithium abundance in M4 red giants (Mucciarelli+, 2011) J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008) J/ApJ/689/1031 : Heavy element abundances in giant stars (Yong+, 2008) J/AJ/127/2771 : HST proper-motions of M4 main-sequence stars (Richer+, 2004) J/AJ/124/1486 : M4 UBV color-magnitude diagrams (Mochejska+, 2002) J/ApJS/120/265 : HST photometry of M4 (Ibata+, 1999) J/AJ/114/189 : M 4 CCD photometry (Alcaino+, 1997) J/PAZh/22/847 : Identification and coordinates in M4 (Shokin+, 1996) J/ApJ/443/124 : Radial Velocities of Stars in M4 (Peterson+ 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Star [5359/45895] Stellar identification number (<Cl* NGC 6121 MVP NNNNN> in Simbad) 7- 10 I4 K Teff [3860/4950] Effective temperature 12- 15 F4.2 [cm/s2] log(g) [0.5/3.05] Log of the surface gravity 17- 20 F4.2 km/s xi [1.1/1.88] Turbulent velocity 22- 26 F5.2 [-] [Na/Fe] [-0.05/0.53] Log Na/Fe number abundance ratio 29- 32 F4.2 [-] e_[Na/Fe] Error in [Na/Fe] 35- 38 F4.2 [-] logn(Li) [0/1.62] Log of Li number abundance 41- 44 F4.2 [-] e_logn(Li) Error in logn(Li)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-Jun-2012
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

catalogue service