Young [α/Fe]-enhanced stars discovered by CoRoT and APOGEE: What is their origin?

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Volume 576 (April 2015)

A&A, 576 (2015) L12

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Table 1

Abundance of young α-enhanced stars (yαr) in recent high-resolution spectroscopic surveys.

Sample	R _Gal ^a	N ^b	1σ/2σ yαr
	[kpc]

Fuhrmann^c, d< 25 pc	8	424	0/0
Bensby et al.^d	8	714	8 (1.1%)/1 (0.1%)
GES^e, \| Z_Gal \| < 0.3 kpc	6–9	55	0/0
GES^e, \| Z_Gal \| > 0.3 kpc	6–9	91	3 (3.3%)/1 (1.1%)
LRa01^f	9–14	288	3 (1.0%)/2 (0.7%)
LRc01^f, \| Z_Gal \| < 0.3 kpc	6–7.5	151	4 (2.6%)/2 (1.3%)
LRc01^f, \| Z_Gal \| > 0.3 kpc	4–6.5	183	21 (11.5%)/13 (7.1%)
APOKASC^g	7–8	1639	14 (0.8%)

Notes.

^(a)

Galactocentric range covered by different samples;

^(b)

N = total number of stars in the sample;

^(c)

The volume-complete sample of Fuhrmann (2011);

^(d)

Hipparcos volume (Bensby et al. 2014);

^(e)

iDR1 (Bergemann et al. 2014);

^(f)

CoRoGEE, this work – see Appendix for detailed information on each star;

^(g)

Martig et al. (2015). Outliers were defined in a different manner than in the present work.

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