FORS2/VLT survey of Milky Way globular clusters - I. Description of the method for derivation of metal abundances in the optical and application to NGC 6528, NGC 6553, M 71, NGC 6558, NGC 6426, and Terzan 8

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Volume 573 (January 2015)

A&A, 573 (2015) A13

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Table 2

Log of observations and cluster parameters from the literature.


Parameter	NGC 6528	NGC 6553	M 71	NGC 6558	NGC 6426	Terzan 8


Date of obs.	29.05.2006	29.05.2006	29.05.2006	29.05.2006	13.07.2012	12.07.2012
UT	08:36:22	08:57:50	09:14:32	06:55:32	02:31:12	07:47:29.346
τ	149.4 s	79.4 s	17.2 s	148.3 s	500.0 s	360 s


RA	18^h04′49.64″	18^h09′17.60″	19^h53′46.49″	18^h10′17.60″	17^h44′54.65″	19^h41′44.41″
Dec	−30°03′22.6″	−25°54′31.3″	+18°46′45.1″	−31°45′50.0″	+03°10′12.5″	−33°59′58.1″
age	13 Gyr⁽¹⁾	13 Gyr⁽¹⁾	11.00 ± 0.38 Gyr⁽²⁾	14 Gyr⁽³⁾	13.0 ± 1.5 Gyr⁽⁴⁾	13.00 ± 0.38 Gyr⁽²⁾
[Fe/H]	−0.11 dex	–0.18 dex	–0.78 dex	−0.97 ± 0.15 dex⁽³⁾	−2.15 dex	−2.16 dex
[Mg/Fe]^a or [α/Fe]^b	0.24^(b,5)	0.26 dex^(b,6)	0.19 ± 0.04^(a,7), 0.40^(b,5)	0.24^(a,3)	0.4^(b,4)	0.47 ± 0.09 ^(a,8)
E(B − V)	0.54	0.63	0.25	0.44	0.36	0.12
(m − M)_V	16.17	15.83	13.80	15.70	17.68	17.47
R _Sun	7.9 kpc	6.0 kpc	4.0 kpc	7.4 kpc	20.6 kpc	26.3 kpc
R _GC	0.6 kpc	2.2 kpc	6.7 kpc	1.0 kpc	14.4 kpc	19.4 kpc
⟨ v_helio ⟩	206.6 ± 1.4 km s^-1	−3.2 ± 1.5 km s^-1	−22.8 ± 0.2 km s^-1	−197.3 ± 4 km s^-1⁽³⁾	−162.0 km s^-1	130.0 km s^-1
r _core	0.13′	0.53′	0.63′	0.03′	0.26′	1.00
r _tidal	4.11′	7.66′	8.90′	9.49′	13.03′	3.98
r _half−light	0.38′	1.03′	1.67′	2.15′	0.92′	0.95

Notes. The main reference is Harris (1996, 2010 edition), when not indicated otherwise.

⁽¹⁾

Zoccali et al. (2001);

⁽²⁾

VandenBerg et al. (2013);

⁽³⁾

Barbuy et al. (2007);

⁽⁴⁾

Dotter et al. (2011);

⁽⁵⁾

Carretta et al. (2010);

⁽⁶⁾

Cohen et al. (1999);

⁽⁷⁾

Meléndez & Cohen (2009);

⁽⁸⁾

Carretta et al. (2014).

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