2008ApJ...681.1524L

Query : 2008ApJ...681.1524L

2008ApJ...681.1524L - Astrophys. J., 681, 1524-1556 (2008/July-2)

Detailed abundances for 28 metal-poor stars: stellar relics in the Milky Way.

LAI D.K., BOLTE M., JOHNSON J.A., LUCATELLO S., HEGER A. and WOOSLEY S.E.

Abstract (from CDS):

We present the results of an abundance analysis for a sample of stars with -4<[Fe/H]←2. The data were obtained with the HIRES spectrograph at Keck Observatory. The set includes 28 stars, with effective temperature ranging from 4800 to 6600 K. For 13 stars with [Fe/H]←2.6, including nine with [Fe/H]←3.0 and one with [Fe/H]=-4.0, these are the first reported detailed abundances. For the most metal-poor star in our sample, CS 30336-049, we measure an abundance pattern that is very similar to stars in the range [Fe/H]~-3.5, including a normal C+N abundance. We also find that it has very low but measurable Sr and Ba, indicating some neutron-capture activity even at this low of a metallicity. We explore this issue further by examining other very neutron capture-deficient stars and find that, at the lowest levels, [Ba/Sr] exhibits the ratio of the main r-process. We also report on a new r-process-enhanced star, CS 31078-018. This star has [Fe/H]=-2.85, [Eu/Fe]=1.23, and [Ba/Eu]=-0.51. CS 31078-018 exhibits an ``actinide boost'', i.e., much higher [Th/Eu] than expected and at a similar level to CS 31082-001. Our spectra allow us to further constrain the abundance scatter at low metallicities, which we then use to fit to the zero-metallicity Type II supernova yields of Heger & Woosley ((ref???)2008). We find that supernovae with progenitor masses between 10 and 20 M☉ provide the best matches to our abundances.

Abstract Copyright: ∼

Journal keyword(s): Nuclear Reactions, Nucleosynthesis, Abundances - Stars: Abundances - Stars: Population II - Stars: Supernovae: General

VizieR on-line data: <Available at CDS (J/ApJ/681/1524): table5.dat width.dat>

Simbad objects: 60

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Number of rows : 60
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 BPS CS 22957-0022 Pe* 00 01 45.4879341216 -05 49 46.650927828   13.95 13.34     ~ 22 0
2 2MASS J00082794+1054198 Pe* 00 08 27.9327429648 +10 54 19.831856724   14.62 14.0     ~ 13 0
3 BPS CS 29497-0004 Pe* 00 28 06.9155612016 -26 03 04.269055032   14.76 14.07 13.583 13.116 ~ 64 0
4 HD 4306 SB* 00 45 27.1616035344 -09 32 39.785396712 9.80 9.75 9.02 8.75   G3/5w(A) 168 0
5 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 233 0
6 HE 0107-5240 Pe* 01 09 29.1555567432 -52 24 34.202039148   15.89 15.07 15.10 14.283 CEMP-no 250 0
7 BD-16 251 RG* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 318 0
8 HE 0239-1340 Pe* 02 41 42.3721546152 -13 28 10.603797240   14.73 13.97 13.566 13.080 CEMP-no 64 0
9 BPS CS 22963-0004 Pe* 02 56 46.5715607688 -04 51 17.421404184   15.51 14.98     ~ 30 0
10 BPS CS 31079-0028 Pe* 03 01 00.6866893176 +06 16 31.808500140   13.900 13.211 12.713 12.190 ~ 39 0
11 HE 0305-5442 Pe* 03 06 29.5014981984 -54 30 32.498486568   14.44 13.70 13.212 12.715 KIIvw 79 0
12 2MASS J03142084-1035112 Pe* 03 14 20.8495451808 -10 35 11.277788028   13.54 12.73 12.204 11.693 KIIvw 73 0
13 HE 0409-1212 Pe* 04 12 13.8814287960 -12 05 05.075250072   13.843 12.897   11.764 ~ 72 0
14 BD+03 740 HB* 05 01 16.6226363256 +04 06 37.021736844 9.97 10.17 9.7 9.6   sdF0 182 0
15 SN 1987A SN* 05 35 27.98840 -69 16 11.1134           SNIIpec 5203 2
16 HE 0557-4840 Pe* 05 58 39.2660594064 -48 39 56.890252404   16.144 15.466 15.336   CEMP-no 92 0
17 HD 59038 * 07 29 05.4304923766 +23 48 05.592213085   9.005 8.797 8.872   A0 7 0
18 BD+24 1676 Pe* 07 30 41.2662525096 +24 05 10.248524088   11.15 10.7 10.4   F 139 0
19 2MASS J10151018+4253173 Pe* 10 15 10.1903157288 +42 53 17.362408452   14.19 13.42 12.950 12.470 ~ 19 0
20 BPS BS 16545-0089 Pe* 11 24 27.5182636872 +36 50 28.816337760   14.76 14.44 14.039 13.812 ~ 24 0
21 BPS BS 16077-0007 Pe* 11 35 17.9891075856 +31 00 23.431937724   12.79 12.40 12.49   ~ 19 0
22 BPS BS 16920-0017 Pe* 12 07 16.8335931408 +41 39 32.430850740   14.69 13.93 13.368 12.877 ~ 20 0
23 BPS BS 16928-0053 Pe* 12 22 28.0240827648 +34 11 31.690230360   14.38 13.54 12.886 12.339 ~ 25 0
24 BPS BS 16929-0005 Pe* 13 03 29.4751261824 +33 51 09.242978436 14.109 14.228 13.610 13.208 12.766 CEMP-no 41 0
25 HD 115444 Pe* 13 16 42.4590842616 +36 22 52.692135420   9.77 8.97 8.3 7.88 G9V 252 0
26 BPS BS 16934-0002 Pe* 13 29 46.5066859200 +16 15 45.145424556   13.733 12.819 12.239 11.670 ~ 17 0
27 HE 1327-2326 Pe* 13 30 05.9394958608 -23 41 49.699340844 13.761 14.01 13.55 13.50 12.803 CEMP-no 258 0
28 BPS BS 16467-0062 Pe* 13 42 00.6326009568 +17 48 40.826539260   14.69 14.09 13.665 13.216 ~ 53 0
29 HE 1356-0622 Pe* 13 59 30.3168806616 -06 36 34.904583792   14.995 14.268 14.313   ~ 16 0
30 BPS BS 16550-0087 Pe* 14 10 26.7272915496 +18 01 23.732433480   14.59 13.76 13.211 12.688 ~ 28 0
31 HE 1424-0241 Pe* 14 26 40.3306297920 -02 54 27.487168164   15.892 15.45 14.887 14.54 ~ 40 0
32 2MASS J14543927+0421380 Pe* 14 54 39.2685981792 +04 21 38.099145888   13.02 12.32 11.849 11.376 ~ 53 0
33 2MASS J15051979+0617069 Pe* 15 05 19.8064435128 +06 17 06.933083424   13.64 12.88 12.387 11.893 CEMP 22 0
34 BPS CS 30306-0132 Pe* 15 14 18.9191634456 +07 27 02.680959780   13.62 12.73 12.421 11.948 ~ 43 0
35 HE 1523-0901 Pe* 15 26 01.0697532504 -09 11 38.885639784   12.37 11.50 10.476 9.863 CEMP 93 0
36 BPS CS 30312-0059 Pe* 15 34 48.8386814136 -01 23 37.343777064   13.85 13.14 12.596 12.065 ~ 29 0
37 BPS CS 22884-0108 Pe* 15 49 57.5787151824 -09 14 09.211901388   14.74 14.24     ~ 27 0
38 BPS BS 16084-0160 Pe* 16 28 50.7923247984 +54 37 06.886218324   13.94 13.12 12.630 12.103 ~ 22 0
39 BPS CS 22872-0102 Pe* 16 29 20.6944419888 -03 04 56.728153128   14.33 13.67 13.64   ~ 16 0
40 BPS CS 22878-0027 Pe* 16 37 35.8437123792 +10 22 07.754788668   14.86 14.4 14.45   CEMP-no 26 0
41 2MASS J16391853+6057426 Pe* 16 39 18.5345769192 +60 57 42.547552920   13.50 12.79   11.786 ~ 20 0
42 BPS BS 16080-0093 Pe* 16 50 38.3051346312 +59 13 06.553935984   14.30 13.6     ~ 14 0
43 BD+17 3248 HB* 17 28 14.4690179544 +17 30 35.847574776   10.02 9.34     KIIvw 239 0
44 BD+23 3130 Pe* 17 32 41.6247211304 +23 44 11.625460773     8.9 8.6   G0III 144 0
45 2MASS J20452353-2842359 Pe* 20 45 23.5333400256 -28 42 35.912310048   14.89 14.03 13.328 12.844 ~ 37 0
46 BPS CS 22880-0086 Pe* 20 45 47.5279506312 -18 33 32.356128240   15.08 14.32 14.36   ~ 21 0
47 BPS CS 22897-0008 Pe* 21 03 11.8565397504 -65 05 08.852220600   14.02 13.33     CEMP-no 80 0
48 BPS CS 29506-0007 Pe* 21 20 28.6541822328 -20 46 22.955304144     14.18     ~ 32 0
49 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
50 BPS CS 22944-0032 Pe* 21 47 43.2239742552 -13 40 22.958906592   13.87 13.28     ~ 21 0
51 HE 2157-3404 Pe* 22 00 17.7010220736 -33 50 03.808011264   13.76 13.13 13.08   ~ 6 0
52 BPS CS 22965-0054 Pe* 22 06 30.2933030688 -02 32 34.433318220   15.69 15.07 14.732 14.072 CEMP-no 39 0
53 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
54 2MASS J22214882+0228448 Pe* 22 21 48.8262598080 +02 28 44.867730936 13.291 13.4 12.74 12.325 12.013 ~ 46 0
55 BPS CS 29502-0092 Pe* 22 22 35.9982138384 -01 38 27.620508552   12.64 11.87 11.365 10.862 CEMP-no 67 0
56 LB 1193 HS* 23 25 31.8649619304 -06 01 11.502462648 14.62 14.41 13.64     sdB+G9 14 0
57 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.125 14.321 14.289 13.358 CEMP-no 184 0
58 HD 221170 Pe* 23 29 28.8087143040 +30 25 57.849303180 9.43 8.74 7.66     CEMP-r 306 0
59 HE 2334-0604 RG* 23 37 28.6873103640 -05 47 56.594641632   14.03 13.28 12.768 12.249 KIIvw 74 0
60 BPS CS 29522-0046 Pe* 23 44 59.8584885288 +08 46 52.866701292   13.29 12.78 12.72   ~ 12 0

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