Metallicity | ![]() |
EMP | CEMP | CNEMP | NEMP | CEMP/EMP | Additional selection criteria | |
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fraction | |||||
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308 | 96 | 31% | only stars with C measured | |||
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373 | 96 | 26% | all EMP stars | |||
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104 | 88 | 0 | 0 | 7 | only stars with C and N measured | |
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373 | 96 | 0 | 0 | 7 | 26% |
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all | ![]() |
779 | 144 | 4 | 14 | 22 | 18% | '' |
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all | 479 | 115 | 0 | 0 | 7 | 24% | '' |
all | all | 1366 | 177 | 6 | 17 | 23 | 13% | '' |
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giants | 132 | 11 | ![]() |
Frebel et al. (2006) | |||
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270 | 58 |
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Lucatello et al. (2006) | ||||
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giants | ![]() |
Cohen et al. (2005) |
The first line of data counts only stars which have a
measurement. The second line of data additionally counts stars without measured
as EMPs, i.e. it is assumed that
for these stars. In the next four lines stars with both measured C
and N are used to count (C)NEMP stars while stars with
C measured count the CEMP stars.
Also shown are estimates of the CEMP/EMP ratio from Cohen et al. (2005), Frebel et al. (2006) and Lucatello et al. (2006).
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