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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]

Fuhrmannc, d< 25 pc 8 424 0/0
Bensby et al.d 8 714 8 (1.1%)/1 (0.1%)
GESe, | ZGal | < 0.3 kpc 6–9 55 0/0
GESe, | ZGal | > 0.3 kpc 6–9 91 3 (3.3%)/1 (1.1%)
LRa01f 9–14 288 3 (1.0%)/2 (0.7%)
LRc01f, | ZGal | < 0.3 kpc 6–7.5 151 4 (2.6%)/2 (1.3%)
LRc01f, | ZGal | > 0.3 kpc 4–6.5 183 21 (11.5%)/13 (7.1%)
APOKASCg 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);

(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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