Free Access
Volume 556, August 2013
Article Number A58
Number of page(s) 13
Section Galactic structure, stellar clusters and populations
Published online 25 July 2013

Online material

Table 1

Basic data for candidate HB and RGB stars observed with UVES (R ~ 40   000) in NGC 5927.

Table 2

Basic data for candidate TO stars observed with GIRAFFE in NGC 5927.

Table 3

Basic data for candidate RGB stars observed with GIRAFFE in NGC 5927.

Table 4

Observing dates, exposure times, average seeing, airmass, and helio-centric corrections for all observations.

thumbnail Fig. 3

Section of three of our target spectra: M151, NGC 5927-05, and T021. The spectra are arranged in order of increasing S/N. Two blue lines (to the left) indicate the location of the Ba ii and Zr i lines at 614.17 nm and 614.31 nm, respectively. The five red lines indicate the position of the Si i line at 615.51 nm, the Na i lines at 615.42 nm and 616.07 nm, and the Ca i lines at 616.13 nm, and 616.64 nm, respectively.

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thumbnail Fig. 5

Sections of spectra for three RGB-GIRAFFE stars. The upper panel shows M151, which we find to be a radial velocity member of NGC 5927. The middle panel shows a portion of the spectrum for M227, which is a cool foreground dwarf star. The bottom panel shows the spectrum of an RGB star that is significantly more metal-poor than the majority of the stars in the cluster.

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thumbnail Fig. 6

Measured radial velocity is shown as a function of the modified Julian date (MJD) for five stars that display unusually large temporal variations in their measured velocities. The vertical extent of all five panels is ± 20 km s-1 from the average radial velocity of the star (shown with a solid line). The dotted line indicates ±1.2 km s-1, which is the average radial velocity σ for the entire RGB-GIRAFFE sample. Of these five stars only M244 has an average radial velocity consistent with membership of NGC 5927.

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© ESO, 2013

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