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Home All issues Volume 506 / No 3 (November II 2009) A&A, 506 3 (2009) 1147-1168 Full HTML
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Table 8:

Summary of determination of systemic velocities, velocity dispersions and metallicities for the Hercules dSph galaxy.
  Number of stars $v_{{\rm sys}}$ $\sigma $ $\langle {\rm [Fe/H]} \rangle $ ${\rm [Fe/H]_{Median}}$
    [ ${\rm ~ km~ s^{-1}}$] [ ${\rm ~ km~ s^{-1}}$]  dex  dex
This study 28 [RGB stars, c1 sel.] ... ... $-2.35 \pm 0.31$ $-2.25^{\rm +0.14}_{-0.31}$
This study 32 [Only $V_{{\rm rad}}$ sel.] $40.87\pm 1.42$ $7.33 \pm 1.08$ ... ...
This study 18 [RGB stars with $V_{{\rm rad}}$] $45.20 \pm 1.09$ $3.72 \pm 0.91$ $-2.34\pm 0.30$ $-2.25^{\rm +0.14}_{-0.20}$
S$\&$G 29 [Their calculation] $45.0^a \pm 1.1$ $5.1^a \pm 0.9 $ ... ...
S$\&$G+c1 13 [c1 sel. sample] $46.10 \pm 1.30$ $4.01 \pm 1.08$ ... ...
Kirby et al. 20 [Their sample] ... ... $-2.58^b \pm 0.51$ ...
Kirby et al.+c1 12 [c1 sel. sample] ... ... $-2.70 \pm 0.47$ $-2.72^{\rm +0.35}_{-0.40}$

a Value from Simon & Geha (2007). b Value from Kirby et al. (2008b).
Columns 1 and 2 list the number of stars for each study and a short description of how the stars were selected. Note: S$\&$G indicates the sample of 29 stars from Simon & Geha (2007). Columns 3 and 4 list the systemic velocities and velocity dispersions and their errors. Column 5 lists the mean metallicities. Column 6 lists the median metallicities. Errors for the median metallicity are the upper and lower quartile. For the calculations we use our metallicites based on Strömgren photometry, but for the Kirby et al. (2008b) sample we use their metallicities.


Source LaTeX | All tables | In the text

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