2007ApJ...658..367K


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET20:25:28

2007ApJ...658..367K - Astrophys. J., 658, 367-390 (2007/March-3)

The origin of carbon enhancement and the initial mass function of extremely metal-poor stars in the Galactic halo.

KOMIYA Y., SUDA T., MINAGUCHI H., SHIGEYAMA T., AOKI W. and FUJIMOTO M.Y.

Abstract (from CDS):

It is known that the carbon-enhanced, extremely metal-poor (CEMP) stars constitute a substantial proportion of the extremely metal-poor (EMP) stars of the Galactic halo, and a by far larger proportion than CH stars among Population II stars. We investigate their origin by taking into account an additional evolutionary path to the surface carbon enrichment, triggered by hydrogen engulfment by the helium flash convection, in EMP stars with [Fe/H]≲-2.5. This process is distinct from the third dredge-up operating in more metal-rich stars and in EMP stars. In binary systems of EMP stars, the secondary stars become CEMP stars through mass transfer from the low- and intermediate- mass primary stars that have developed the surface carbon enhancement. Our binary scenario can predict the variations in the abundances not only for carbon but also for nitrogen and s-process elements and can reasonably explain the observed properties such as the stellar distributions of the carbon abundances, the binary periods, and the evolutionary stages. Furthermore, from the observed frequencies of CEMP stars with and without s-process element enhancement, we demonstrate that the initial mass function of EMP stars needed gives the mean mass∼10 Munder the reasonable assumptions for the distributions of orbital separations and mass ratios of the binary components. This also indicates that the currently observed EMP stars were exclusively born as the secondary members of binaries, making up ∼10% of EMP binary systems, with mass∼108 Min total; in addition to CEMP stars with white dwarf companions, a significant fraction of them have experienced supernova explosions of their companions. We discuss the implications of the present results for the formation of the Galactic halo.

Abstract Copyright:

Journal keyword(s): Galaxy: Halo - Stars: Abundances - Stars: Carbon - Stars: Evolution - Stars: Luminosity Function, Mass Function

VizieR on-line data: <Available at CDS (J/ApJ/658/367): table1.dat table2.dat refs.dat>

Simbad objects: 122

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Number of rows : 122

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 HD 224959 Pe* 00 02 08.0224361239 -02 49 12.239963584   10.6 9.55     C1,1_CH4 85 0
2 HD 26 Pe* 00 05 22.2077761394 +08 47 16.096990670 9.80 9.29 8.25 7.49 7.03 C-H1.5 161 0
3 HE 0007-1832 Pe* 00 09 52.7814403998 -18 16 12.276852284     15.46     CEMP-no 18 0
4 HE 0024-2523 Pe* 00 27 27.6485410349 -25 06 28.291081599 15.067 15.32 14.91     CEMP-s 65 0
5 BPS CS 31062-0050 Pe* 00 30 31.0633474070 -12 05 10.873150611   13.7 13.05 12.681 12.309 CEMP-r/s 60 0
6 CD-24 266 BS* 00 40 47.9313778053 -24 07 34.183052519   12.955 12.656 12.441 12.216 CEMP-s 89 0
7 SKB 2 Pe* 00 41 39.8197261334 -26 18 54.463949137   13.338 12.221 11.704 11.321 C1,2 82 0
8 HD 4084 Pe* 00 42 42.5159894198 -55 50 38.113733115   9.77 8.60     K1pBa 23 0
9 SB 960 Pe* 00 44 03.5698517387 -13 55 26.270588506   12.69 12.15 11.806 11.483 CEMP-s 102 0
10 HD 4395 Pe* 00 46 13.7500176554 -11 27 08.554143149   8.39 7.68 7.33   G5/6III 65 0
11 CD-38 245 Pe* 00 46 36.1954714218 -37 39 33.555736375   12.733 11.929 13.39 10.996 KIIvw 200 0
12 CD-31 306 BS* 00 50 15.7694437410 -30 59 56.199734557   12.73 12.72     F3VkA2mA2 30 0
13 HD 5223 Pe* 00 54 13.6094686085 +24 04 01.522268338   9.88 8.47     C-H2IIIb: 110 0
14 CD-26 304 Pe* 00 57 18.1376089543 -25 26 09.699477820   13.57 12.69 12.198 11.759 CEMP-s 61 1
15 HD 5825 Pe* 00 59 25.4533345933 -34 38 10.608193563   8.63 7.68     G8pBa 22 0
16 HE 0058-0244 Pe* 01 00 53.0236506123 -02 28 19.948243997   14.42 13.73 13.331 12.942 CEMP-r/s 34 0
17 HE 0107-5240 Pe* 01 09 29.1554552993 -52 24 34.203535506   15.89 15.07 15.10 14.283 CEMP-no 225 0
18 HE 0143-0441 Pe* 01 45 37.9166316774 -04 26 43.245126791     16.38     CEMP-s 26 0
19 HD 11377 SB* 01 51 28.5147238690 -16 44 25.645829394   9.02 8.48     F7V 37 0
20 * ksi01 Cet EB* 02 12 59.9976927035 +08 50 48.202315944 5.86 5.23 4.35 3.68 3.18 G7IIIBa0.4Fe-1 204 1
21 HD 15589 Pe* 02 29 26.5532471411 -36 08 58.785594617   10.13 8.97     G8II 26 0
22 HD 16458 Pe* 02 47 47.7322966372 +81 26 54.517420201   7.091 5.781     K1Ba5 149 0
23 BPS CS 29526-0110 Pe* 03 27 43.6395462631 -23 00 29.931204041   13.71 13.35 13.116 12.834 CEMP-r/s 46 0
24 G 77-61 Pe* 03 32 38.0871477505 +01 58 00.010460312   15.60 13.90 12.9   dC-J_CH5 123 0
25 V* UV Cam C* 04 05 53.8492693966 +61 47 39.976105052   9.86 7.60     C-J4 94 0
26 HD 27271 SB* 04 18 33.8263595544 +02 28 13.914564523   8.53 7.52     G8II 45 0
27 HD 30443 Pe* 04 49 16.0206954611 +35 00 06.478684166   11.2 8.82     C5,3_CH9_CN6.5_Ba7 50 0
28 HD 31487 SB* 04 59 03.7288656602 +51 56 32.070674579   9.47 8.12     G8IIIBa3 44 0
29 CD-38 2151 Pe* 05 40 01.9427129484 -38 49 25.884826623   10.75 9.27     Kp_CH 11 0
30 V* TU Gem C* 06 10 53.1008 +26 00 53.354     9.40     C-N5+ 110 0
31 HD 44896 SB* 06 22 53.7674312529 -33 36 52.569649260 10.79 8.90 7.27     K4.5IIIa:Ba4 53 0
32 V* HR CMa Al* 06 32 46.8721481683 -11 09 58.968732064 8.12 7.35 6.24 5.49 5.01 G9III:Ba3.5 165 0
33 HD 49641 SB* 06 49 29.4499123278 +03 41 30.139894956   8.47 7.12     K0Ib 40 0
34 HD 50264 SB* 06 51 12.5072805598 -29 34 32.322886486   9.63 9.05     G1.5II-III:_Ba2_CH0.5 44 0
35 HD 58368 SB* 07 25 38.9663428167 +07 33 39.033534275   9.01 7.99     K0 45 0
36 V* NQ Gem Sy* 07 31 54.5215639809 +24 30 12.543689289   10.19 8.01     C6,2_CH3 88 0
37 HD 60197 SB* 07 32 07.9566256946 -29 38 06.457535111 11.52 9.50 7.76     K3.5III:Ba3.5 53 0
38 * 12 Pup Pe* 07 59 05.7144573705 -23 18 37.429253195 7.15 6.23 5.11     G9IIa 79 0
39 HD 65966 Pe* 07 59 34.2717462287 -40 45 09.177080093   7.84 7.70     A3IV/V 6 0
40 HD 76225 ** 08 54 00.8616289930 -26 54 56.385901380   9.73 9.20     F7/G+A(pSr) 32 0
41 V* PV UMa SB* 09 03 32.2721861555 +53 06 29.819107144   7.86 6.86     G7III:Ba0.5 65 0
42 * y Vel Pe* 09 38 01.4522425087 -43 11 27.365564591 7.18 6.50 5.50     G8IIIBa1.5 114 0
43 HD 87080 SB* 10 02 00.8598789132 -33 41 06.508653916   10.15 9.37     G6III_Ba5.5_CH 45 0
44 HD 88446 PM* 10 12 19.0773304082 +17 17 57.051756021   8.40   7.5   Gwl 101 0
45 HD 89638 Pe* 10 20 13.1822814817 -23 06 09.245521681   8.43 7.48     G8III 21 0
46 HD 89948 SB* 10 22 21.8602764847 -29 33 21.560135988 8.12 8.11 7.55     G2IIIBa1 69 0
47 HD 92626 SB* 10 40 49.9681151809 -48 01 30.407389734 9.53 8.44 7.09     K0_Ba5 80 0
48 HD 92545 Pe* 10 40 57.7072314402 -12 11 44.223424837   9.07 9.149 8.25 9.047 F7IV 38 0
49 BD+42 2173 Pe* 11 00 00.4407383562 +41 36 07.905552269   11.4 10.08     C3,2_CH4 37 0
50 * 58 Leo ** 11 00 33.6475277060 +03 37 02.989587907   6.007 4.838     K0.5IIIFe-0.5 149 0
51 HD 100012 Pe* 11 30 20.6691965652 -25 47 54.977037912 8.51 7.64 6.59     G9III 34 0
52 HD 101013 SB* 11 37 53.0007631393 +50 37 05.472894065   7.200 6.113     G9:IIIb:Ba2.5 132 0
53 HE 1152-0355 Pe* 11 55 06.0576239522 -04 12 24.588631548 15.432 13.889 11.43 10.64 10.236 CEMP-s 22 0
54 V* TZ Crv LP* 12 00 57.2663387395 -21 15 02.778916850 10.82 9.55 8.14     G6/8IIICNII 36 0
55 * omi Vir PM* 12 05 12.5404884 +08 43 58.749788 5.75 5.11 4.12 3.38 2.89 G8IIICN0.5CH1Ba1 265 0
56 HD 107574 SB* 12 21 51.8580902959 -18 24 00.255862910   8.99 8.54     F3IV/V 45 0
57 HD 109061 Pe* 12 32 05.4692208650 -43 32 10.255400874   9.14 8.10 7.46   G8II/III 28 0
58 BD+17 2537 SB* 12 47 22.5613426778 +16 49 35.158503432   9.52 8.80     G0 22 0
59 HD 111908 Pe* 12 52 29.4211169149 +07 12 28.501368648   10.42 9.31     C2,1_CH5 46 0
60 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 33 0
61 BPS BS 16033-0008 Pe* 13 05 56.1655327571 +25 10 16.026232775   14.42 13.79 13.367 12.943 ~ 5 0
62 HE 1305+0007 Pe* 13 08 03.8464221671 -00 08 47.501674274   13.98 12.223 11.541 11.071 CEMP-s 27 0
63 BPS CS 22877-0001 Pe* 13 13 55.3726645896 -12 11 41.664182839   12.78 12.38 11.695 11.218 CEMP-no 34 0
64 HD 116713 Pe* 13 26 07.7990298137 -39 45 18.456410720 7.31 6.29 5.09     K0.5IIIbBa3 127 0
65 HE 1327-2326 Pe* 13 30 05.9395582011 -23 41 49.699027289 13.761 14.01 13.55 13.50 12.803 CEMP-no 211 0
66 HD 121447 Pe* 13 55 46.9649688947 -18 14 56.480134690 11.50 9.61 7.80     C2,1_CH4:_Ba4 115 0
67 HD 122202 SB* 14 00 18.9645085651 +04 51 25.034821599   9.85 9.36     F8 17 0
68 HD 123585 SB* 14 09 35.7952107527 -44 22 01.195989267   9.75 9.23     G0III_Ba3_CH 55 0
69 HD 125097 ** 14 18 26.3062 -43 52 13.496           F5V 4 0
70 BPS CS 30325-0094 Pe* 14 54 39.2685324873 +04 21 38.098655567   13.02 12.32 11.849 11.376 ~ 43 0
71 HD 131670 SB* 14 55 13.8266275115 -07 17 34.486149597   9.26 8.01     K0II 40 0
72 BPS CS 30325-0028 Pe* 15 05 19.8064547847 +06 17 06.934045062   13.64 12.88 12.387 11.893 ~ 16 0
73 BPS CS 30301-0015 Pe* 15 08 56.8433023195 +02 30 18.628172611   14.04 13.04   12.063 CEMP-s 43 0
74 HD 135148 SB* 15 13 17.4566658985 +12 27 25.536244668   10.87 9.39 8.97   CEMP-s 86 0
75 * 16 Ser SB* 15 36 29.5749786777 +10 00 36.557426427   6.217 5.253     K0III:CN1Ba0.7Sr2 195 0
76 HD 141804 SB* 15 53 29.2418948912 -54 09 30.603522851   9.61 9.03     F8/G0II 18 0
77 LP 625-44 Pe* 16 43 14.0364804654 -01 55 30.408914037   12.84 11.68     CEMP-s 101 0
78 HD 150862 ** 16 44 44.0888580876 -25 12 59.338279935   9.72 9.19     F7V+A(pSr) 27 0
79 BPS CS 22878-0101 Pe* 16 45 31.4514010341 +08 14 45.471045094   14.59 13.79   12.673 KIIvw 55 0
80 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11246 0
81 HD 176021 Pe* 19 02 37.2719391560 -64 55 30.923963632   8.20 7.58     G0/1III 69 0
82 HD 178717 SB* 19 09 22.0092372317 +10 14 28.243016839   9.05 7.14     K3.5III:Ba4+ 105 0
83 BPS CS 22947-0187 HB* 19 18 31.6263239095 -47 13 31.155732437   13.63 12.99 12.508 12.085 CEMP-s 35 0
84 HD 182274 SB* 19 23 12.5376833059 +19 22 31.290411216   8.25 7.80     F6V 62 0
85 HD 187216 Pe* 19 24 18.3451130483 +85 21 57.185833557   11.2 9.56     C3,3_CH5: 67 2
86 BPS CS 22891-0200 Pe* 19 35 19.0776617459 -61 42 24.374411136   14.77 13.93   12.79 CEMP-no 35 0
87 HD 187861 Pe* 19 56 26.9429735087 -65 22 08.017100343   10.42 9.18     C1,1p_CH 54 0
88 HD 188985 Pe* 19 59 58.2969528328 -48 58 31.180568493   9.07 8.56     G2III_Ba1 40 0
89 HD 189711 Pe* 20 01 03.7891766338 +09 30 51.154617612 12.71 10.43 8.37 7.02 5.96 C4,3_CH3:_Ba5 66 0
90 * ksi Cap Pe* 20 12 25.8706277984 -12 37 02.993423848   6.33 5.85     F7VFe-0.5 80 0
91 HD 196673 ** 20 37 44.3242645 +33 21 59.371434           K0pBa+G5III 53 0
92 HD 196944 Pe* 20 40 46.0790261041 -06 47 50.650812411   9.01 8.40 8.08   CEMP-s 85 0
93 HD 197604 Pe* 20 43 34.9807100370 +35 04 22.676516166   10.70 9.28     C4,2_CH8 40 0
94 BPS CS 22880-0074 Pe* 20 46 03.2162078511 -20 59 14.111093923   13.84 13.27 12.770 12.382 CEMP-s 44 0
95 HD 198269 Pe* 20 48 36.7373846084 +17 50 23.700525129   9.41 8.12     C-H3IV: 77 0
96 BPS CS 30314-0067 Pe* 20 52 50.9876997217 -34 19 40.549001966   12.98 11.85 11.175 10.583 CEMP-no 26 0
97 HD 199394 SB* 20 55 09.1166220082 +46 21 00.569087871   8.001 6.984     K0III 61 0
98 HD 199939 SB* 20 58 43.4952470116 +44 24 52.450966669   8.74 7.44     G9III:Ba4 78 0
99 BPS CS 22897-0008 Pe* 21 03 11.8563237064 -65 05 08.852932036   14.02 13.33     CEMP-no 62 0
100 BPS CS 29498-0043 Pe* 21 03 52.1197489072 -29 42 50.344264361   14.8 13.72 13.013 12.406 CEMP-no 85 0
101 * ksi Cyg SB* 21 04 55.8622910 +43 55 40.264460 7.17 5.39 3.73 2.55 1.63 K4.5Ib-II 294 0
102 BPS CS 22898-0027 Pe* 21 05 45.0995574992 -18 36 57.505496795   13.26 12.76 12.476 12.094 CEMP-r/s 79 0
103 HD 201626 Pe* 21 09 59.2669493692 +26 36 55.010503706 9.73 9.26 8.16 7.34 6.82 C-H2IV: 139 0
104 HD 202020 SB* 21 13 39.4683718792 -09 37 41.809961459   9.90 9.37     G8/K(II)+(F) 21 0
105 HD 202190 Pe* 21 14 35.4147549583 -14 44 42.285949902   11.52 11.48     G0V 3 0
106 * zet Cap SB* 21 26 40.0263390 -22 24 40.804197 5.35 4.75 3.74 3.09 2.65 G4Ib:Ba2 264 1
107 HD 204613 SB* 21 27 43.0051874955 +57 19 18.960564661       7.8   G1IIIa:_CH1.5 95 0
108 HD 205011 SB* 21 31 50.1440984214 +23 50 42.551089035   7.50 6.42     G9+IIIaBa1+ 65 0
109 HE 2134-3940 Pe* 21 37 45.7673672486 -39 27 22.314122762   13.790 12.660 12.160 11.760 KIIvw 81 0
110 BPS CS 22956-0028 SB* 21 44 48.7079276715 -63 22 09.738970394   13.317 13.0     CEMP-s 23 0
111 HE 2148-1247 Pe* 21 51 17.9099257554 -12 33 41.560711332   15.2 14.79     CEMP-r/s 43 0
112 HD 209621 Pe* 22 04 25.1407342403 +21 03 09.003434369   10.41 8.86     C-H3III: 98 0
113 BPS CS 22881-0036 Pe* 22 07 58.4409012147 -40 44 16.477797121   14.42 13.95 13.633 13.278 CEMP-s 34 0
114 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 403 0
115 BPS CS 29516-0041 Pe* 22 21 48.8261125099 +02 28 44.864481048 13.291 13.4 12.74 12.325 12.013 ~ 35 0
116 BPS CS 29502-0092 Pe* 22 22 35.9981441327 -01 38 27.624102360   12.64 11.87 11.365 10.862 CEMP-no 44 0
117 HD 216219 Pe* 22 50 52.1514570495 +18 00 07.749391635   8.06 7.44     G1II-III:Fe-1CH0.5 103 0
118 HD 219116 Pe* 23 13 30.2401730293 -17 22 08.693389900   10.29 9.25     G9III_Ba2 35 0
119 HE 2323-0256 Pe* 23 26 29.8073543039 -02 39 58.037206596   15.12 14.36   13.358 CEMP-no 166 0
120 HE 2334-0604 Pe* 23 37 28.6873335486 -05 47 56.594686365   14.03 13.28 12.768 12.249 KIIvw 67 0
121 HD 223617 SB* 23 51 06.7959502686 +02 14 16.262352546   8.107 6.925     G8/K0Iab/b 54 0
122 HE 2356-0410 Pe* 23 59 13.1417869434 -03 53 48.220053208   14.39 13.60 13.164 12.713 CEMP-no 80 0

    Equat.    Gal    SGal    Ecl

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2020.02.17-20:25:28

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