2015A&A...580A..32M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET11:45:10

2015A&A...580A..32M - Astronomy and Astrophysics, volume 580A, 32-32 (2015/8-1)

The first stars: a classification of CEMP-no stars.

MAEDER A. and MEYNET G.

Abstract (from CDS):

We propose and apply a new classification for the CEMP-no stars, which are carbon-enhanced metal-poor stars with no overabundance of s-elements and with [Fe/H] generally ≤-2.5. This classification is based on the changes in abundances for the elements and isotopes involved in the CNO, Ne-Na, and Mg-Al nuclear cycles. These abundances change very much owing to successive back and forth mixing motions between the He- and H-burning regions in massive stars (the ``source stars'' responsible for the chemical enrichment of the CEMP-no stars). The wide variety of the ratios [C/Fe], 12C/13C, [N/Fe], [O/Fe], [Na/Fe], [Mg/Fe], [Al/Fe], [Sr/Fe], and [Ba/Fe], which are the main characteristics making the CEMP-no and low-s stars so peculiar, is described well in terms of the proposed nucleosynthetic classification. We note that the [(C+N+O)/Fe] ratios significantly increase for lower values of [Fe/H]. The classification of CEMP-no stars and the behavior of [(C+N+O)/Fe] support the presence, in the first stellar generations of the Galaxy, of fast-rotating massive stars experiencing strong mixing and mass loss (spinstars). This result has an impact on the early chemical and spectral evolution of the Galaxy.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: Population III - stars: massive - stars: low-mass - stars: evolution - Galaxy: evolution

CDS comments: Segue 1-7 is SDSS J100814.44+160501.1 in SIMBAD. 53327-2044-515 is SDSS J014036.22+234458.1 in SIMBAD.

Simbad objects: 48

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Number of rows : 48

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HE 0007-1832 Pe* 00 09 52.7814403998 -18 16 12.276852284     15.46     CEMP-no 19 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9566 1
3 BPS CS 22166-0016 Pe* 00 58 23.8414780886 -14 47 06.881569381   13.34 12.75 12.324 11.898 CEMP-no 19 0
4 HE 0057-5959 Pe* 00 59 53.9858308128 -59 43 29.745940196   16.4       CEMP-no 29 0
5 HE 0100-1622 Pe* 01 02 58.4692233090 -16 06 30.952859719   16.659 15.822 15.370 14.940 CEMP-no 8 0
6 HE 0107-5240 Pe* 01 09 29.1554552993 -52 24 34.203535506   15.89 15.07 15.10 14.283 CEMP-no 229 0
7 HE 0134-1519 Pe* 01 37 05.3769545718 -15 04 22.792633672   14.937 14.474 14.018 13.683 CEMP-no 15 0
8 SDSS J014036.21+234458.1 Pe* 01 40 36.2206962306 +23 44 58.204189219   15.6       CEMP-no 32 0
9 HE 0146-1548 Pe* 01 48 34.7216176944 -15 33 24.493790664   16.406 15.725 15.193 14.658 CEMP-no 14 0
10 BPS CS 22958-0042 Pe* 02 01 07.4296353198 -57 16 58.851945318   14.037 14.52 14.222 13.902 CEMP-no 35 0
11 BD+44 493 Pe* 02 26 49.7388403813 +44 57 46.526253277   9.63 9.11     CEMP-no 85 0
12 HE 0233-0343 Pe* 02 36 29.7931232841 -03 30 06.028585140   15.867 15.430 15.171 14.818 CEMP-no 29 0
13 SMSS J031300.36-670839.3 Pe* 03 13 00.3747490864 -67 08 39.336567558           CEMP-no 86 0
14 G 77-61 Pe* 03 32 38.0871477505 +01 58 00.010460312   15.60 13.90 12.9   dC-J_CH5 125 0
15 HE 0440-1049 Pe* 04 42 39.9457051100 -10 43 23.912072999   13.02 12.52 12.51   CEMP-no 10 0
16 2MASS J04442200-4513542 C* 04 44 22.0060297382 -45 13 54.233994954 13.219 13.51 12.989 12.672 12.372 CEMP-s 22 0
17 HE 0557-4840 Pe* 05 58 39.2661082631 -48 39 56.890701762   16.16 15.45 14.991   CEMP-no 81 0
18 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1004 1
19 SDSS J100814.44+160501.1 RB? 10 08 14.4416905347 +16 05 01.188764402           ~ 21 1
20 HE 1012-1540 Pe* 10 14 53.4754858508 -15 55 53.171904692     14.04     CEMP-no 32 0
21 HE 1150-0428 Pe* 11 53 06.6089448606 -04 45 03.484251112     14.91     CEMP-no 27 0
22 HE 1201-1512 Pe* 12 03 37.0450878463 -15 29 33.235237621   14.2       CEMP-no 17 0
23 HE 1300+0157 Pe* 13 02 56.2444113387 +01 41 52.080881619   14.536 14.11 13.678 13.261 CEMP-no 40 0
24 HE 1300-2201 Pe* 13 03 17.3213523004 -22 17 37.978293961     15.469   14.772 CEMP-no 12 0
25 BPS BS 16929-0005 Pe* 13 03 29.4750923367 +33 51 09.243677482 14.109 14.228 13.610 13.208 12.766 CEMP-no 34 0
26 HE 1300-0641 Pe* 13 03 34.1329709575 -06 57 20.869199156     14.804   13.929 CEMP-no 15 0
27 HE 1310-0536 Pe* 13 13 31.1856625664 -05 52 12.533547463   15.055 14.347 13.829   CEMP-no 24 0
28 BPS CS 22877-0001 Pe* 13 13 55.3726645896 -12 11 41.664182839   12.78 12.38 11.695 11.218 CEMP-no 35 0
29 HE 1327-2326 Pe* 13 30 05.9395582011 -23 41 49.699027289 13.761 14.01 13.55 13.50 12.803 CEMP-no 217 0
30 HE 1330-0354 Pe* 13 33 10.6752281912 -04 10 05.803050230   15.248 15.000 14.730 14.380 CEMP-no 16 0
31 HE 1410+0213 Pe* 14 13 06.5623968167 +01 59 21.912907907   14.29 13.25 12.734 12.297 CEMP-no 22 0
32 2MASS J14215106-1338135 * 14 21 51.0678047673 -13 38 13.410092314   14.802 14.708 14.176 13.713 ~ 9 0
33 HE 1506-0113 Pe* 15 09 14.2926751829 -01 24 56.730409770   15.4       CEMP-no 22 0
34 BPS CS 22878-0027 Pe* 16 37 35.8437255100 +10 22 07.754675906   14.86 14.35 14.45   CEMP-no 23 0
35 BPS CS 22885-0096 Pe* 20 20 51.1729562140 -39 53 30.235406812   14.02 13.33     CEMP-no 82 0
36 BPS CS 30314-0067 Pe* 20 52 50.9876997217 -34 19 40.549001966   12.98 11.85 11.175 10.583 CEMP-no 27 0
37 BPS CS 29498-0043 Pe* 21 03 52.1197489072 -29 42 50.344264361   14.8 13.72 13.013 12.406 CEMP-no 88 0
38 BPS CS 30322-0023 * 21 30 32.1818570433 -46 16 24.615679322   13.473 12.166 11.498 10.908 ~ 47 0
39 HE 2139-5432 Pe* 21 42 42.4475156604 -54 18 42.968678598   15.9       CEMP-no 27 0
40 BPS CS 22956-0028 SB* 21 44 48.7079276715 -63 22 09.738970394   13.317 13.0     CEMP-s 23 0
41 HE 2142-5656 Pe* 21 46 20.50080 -56 42 18.0080   14.4       CEMP-no 11 0
42 HE 2202-4831 Pe* 22 06 06.00020 -48 16 53.0089   16.3       CEMP-no 12 0
43 BPS CS 29502-0092 Pe* 22 22 35.9981441327 -01 38 27.624102360   12.64 11.87 11.365 10.862 CEMP-no 45 0
44 HE 2247-7400 Pe* 22 51 19.60360 -73 44 21.0051   14.4       CEMP-no 11 0
45 BPS CS 22945-0017 Pe* 23 20 55.6263860111 -63 15 36.787084717   14.83 14.44 14.50   ~ 20 0
46 HE 2323-0256 Pe* 23 26 29.8073543039 -02 39 58.037206596   15.12 14.36   13.358 CEMP-no 172 0
47 HE 2331-7155 Pe* 23 34 36.1726538219 -71 38 50.939940188   14.73   13.82   CEMP-no 8 0
48 HE 2356-0410 Pe* 23 59 13.1417869434 -03 53 48.220053208   14.39 13.60 13.164 12.713 CEMP-no 82 0

    Equat.    Gal    SGal    Ecl

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2020.10.31-11:45:10

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