Atomic diffusion and mixing in old stars - IV. Weak abundance trends in the globular cluster NGC 6752

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Volume 555 (July 2013)

A&A, 555 (2013) A31

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Table 4

Mean stellar parameters using (b − y) photometry and derived mean abundances for stars in NGC 6752 from the co-added spectra.

Group	T _eff	log g	ξ	[Fe/H]	log ε(Mg)^a	log ε(Sc)^b	log ε(Ti)^c	log ε(Ca)^d	log ε(Ba)^e
	(K)	(cgs)	(km s^-1)	(dex)	NLTE	LTE	LTE	NLTE	NLTE

TOP_ave	6068	4.00	2.00	−1.74	6.01	1.23	3.39	4.88	0.46
SGB_ave	5793	3.79	1.50	−1.68	6.05	1.21	3.28	4.76	0.44
bRGB_ave	5256	3.26	1.40	−1.65	6.16	1.30	3.44	4.93	0.48
RGB_ave	5031	2.58	1.45	−1.64	6.12	1.32	3.47	4.96	0.42

Notes.

^(a)

Based on Mg I λλ5528 and 5711. RGB_ave Mg abundance derived by disregarding star 548 and using T_eff = 5021 K, log g = 2.58, and ξ = 1.45 km s^-1.

^(b)

Based on Sc II λλ5031, 5526 and 5657. Note that the Sc abundances for the bRGB and RGB stars can be slightly overestimated due to ignoring HFS.

^(c)

Based on Ti II λλ5129, 5154, 5185, 5226 and 5336.

^(d)

Based on Ca I λλ6169 and 6493.

^(e)

Based on Ba II λλ6141. TOP_ave Ba abundance derived by disregarding star 3988 and using T_eff = 6070 K, log g = 4.00, and ξ = 2.00 km s^-1.

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