2018ApJ...858...92H

Query : 2018ApJ...858...92H

2018ApJ...858...92H - Astrophys. J., 858, 92-92 (2018/May-2)

The r-process alliance: first release from the southern search for r-process-enhanced stars in the galactic halo.

HANSEN T.T., HOLMBECK E.M., BEERS T.C., PLACCO V.M., ROEDERER I.U., FREBEL A., SAKARI C.M., SIMON J.D. and THOMPSON I.B.

Abstract (from CDS):

The recent detection of a binary neutron star merger and the clear evidence of the decay of radioactive material observed in this event have, after 60 years of effort, provided an astrophysical site for the rapid neutron-capture (r-) process which is responsible for the production of the heaviest elements in our universe. However, observations of metal-poor stars with highly enhanced r-process elements have revealed abundance patterns suggesting that multiple sites may be involved. To address this issue, and to advance our understanding of the r-process, we have initiated an extensive search for bright (V < 13.5), very metal-poor ([Fe/H] < -2) stars in the Milky Way halo exhibiting strongly enhanced r-process signatures. This paper presents the first sample collected in the southern hemisphere using the echelle spectrograph on du Pont 2.5 m telescope at Las Campanas Observatory. We have observed and analyzed 107 stars with -3.13 < [Fe/H] < -0.79. Of those, 12 stars are strongly enhanced in heavy r-process elements (r-II), 42 stars show moderate enhancements of heavy r-process material (r-I), and 20 stars exhibit low abundances of the heavy r-process elements and higher abundances of the light r-process elements relative to the heavy ones (limited-r). This search is more successful at finding r-process-enhanced stars compared to previous searches, primarily due to a refined target selection procedure that focuses on red giants.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: Population II

VizieR on-line data: <Available at CDS (J/ApJ/858/92): list.dat ew_all.dat>

Simbad objects: 115

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Number of rows : 115
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 UCAC2 27019278 Pe* 00 00 22.5920369016 -13 02 27.615586344   13.795 12.891 12.69 11.77 CEMP 14 0
2 UCAC4 337-000045 Pe* 00 02 12.2355430416 -22 41 38.941412100   14.03 13.27 13.24   ~ 4 0
3 UCAC4 326-000048 Pe* 00 02 16.6882893336 -24 53 49.488361116   14.32 13.48 13.28   ~ 8 0
4 TYC 5267-375-1 Pe* 00 13 30.6971035032 -12 59 59.685704556   12.98 11.54     ~ 10 0
5 DENIS J002330.6-163142 Pe* 00 23 30.6793314144 -16 31 43.118622696   12.855 12.282 12.41 11.499 CEMP 18 0
6 UCAC4 233-000699 Pe* 00 40 06.8638990800 -43 25 18.387084360   13.457 12.326 12.078   ~ 22 0
7 CD-52 112 Pe* 00 40 52.5867595512 -51 22 48.989991000   11.737 11.225     F7Vwl 41 0
8 UCAC2 791523 Pe* 00 45 39.3333667344 -74 57 29.521337112   12.587 11.685 11.62 10.75 CEMP 13 0
9 UCAC2 8177127 Pe* 01 20 22.3242285960 -54 25 58.275763320   13.305 12.608 12.74 11.88 ~ 7 0
10 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
11 UCAC2 20534548 SB* 01 33 46.5790846248 -27 27 37.379261880   13.422 12.338 12.15 11.36 CEMP 10 0
12 TYC 8046-39-1 Pe* 01 42 54.2096858928 -50 32 48.773874624   11.970 11.339     ~ 16 0
13 TYC 8853-1317-1 Pe* 01 43 07.2618573936 -64 45 17.477962956   12.810 11.982     ~ 10 0
14 HIP 8191 SB* 01 45 19.5304652232 -28 00 58.457480400   12.760 11.711     ~ 18 0
15 CD-49 506 Pe* 01 49 07.9444788408 -49 11 42.923908572   11.944 11.172     CEMP-r 19 0
16 HD 11582 Pe* 01 53 00.2437340784 -34 17 36.393581688   10.27 9.58     G5/6(V)w 52 0
17 2MASS J02040793-3127556 Pe* 02 04 07.9218753312 -31 27 55.638679500   13.474 12.589 11.996 11.484 ~ 13 0
18 UCAC2 676047 Pe* 02 16 57.1640931288 -75 47 06.581963508   12.974 11.937 11.71 10.69 CEMP 16 0
19 UCAC2 2211263 Pe* 02 35 58.6650136344 -67 45 51.997091688   13.271 11.905 11.64 10.76 CEMP 10 0
20 DENIS J024010.7-141628 Pe* 02 40 10.7590946664 -14 16 29.248792356   13.48   12.58 12.301 CEMP 10 0
21 TYC 5866-150-1 Pe* 02 41 21.5371405608 -18 25 37.731470988   12.939 11.736     ~ 10 0
22 TYC 8056-152-1 Pe* 02 44 14.7960956136 -51 58 24.111808572   12.19 11.570 11.143 10.707 ~ 11 0
23 UCAC2 26140348 Pe* 02 46 20.1351143184 -15 18 41.856499728   13.20 12.44 12.30 11.44 CEMP 20 0
24 UCAC4 192-002619 Pe* 02 50 07.1844188832 -51 45 14.935216068   13.569 12.440 12.322   CEMP 15 0
25 CD-33 1173 Pe* 03 19 35.3159594880 -32 50 43.157572008   11.272 10.902 10.421 10.152 CEMP 63 0
26 TYC 8507-1765-1 Pe* 03 56 37.0353995424 -58 38 28.070925396   12.761 11.450 10.694 10.043 CEMP 20 0
27 HE 0409-1212 Pe* 04 12 13.8814287960 -12 05 05.075250072   13.843 12.897   11.764 ~ 72 0
28 HE 0524-2055 Pe* 05 27 04.4443239912 -20 52 42.096542448     14.013   12.937 ~ 18 0
29 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
30 TYC 6708-260-1 Pe* 13 16 48.2344641360 -27 43 35.082242688   12.300 11.473     ~ 9 0
31 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 920 0
32 CD-33 9514 Pe* 14 03 35.4314575056 -33 35 25.675628820   12.243 11.544 11.02   K1:wl 30 0
33 TYC 6731-975-1 Pe* 14 16 40.8391305936 -24 22 00.049664064   11.911 10.873 10.38 9.684 ~ 19 0
34 2MASS J14232679-2834200 Pe* 14 23 26.7859641744 -28 34 20.084925468   13.510 12.720 12.2 11.698 ~ 15 0
35 UCAC2 22479848 Pe* 14 30 13.8563844408 -23 17 38.815190196   13.462 11.981 11.67 10.53 ~ 10 0
36 TYC 7814-133-1 Pe* 14 32 53.3360210280 -41 25 49.477241028   11.76 11.08     ~ 15 0
37 UCAC2 23384621 Pe* 14 38 11.1945844512 -21 20 08.521690920   12.610 11.373 11.16 10.79 CEMP 10 0
38 HE 1523-0901 Pe* 15 26 01.0697532504 -09 11 38.885639784   12.37 11.50 10.476 9.863 CEMP 93 0
39 CD-23 12296 Pe* 15 27 13.5096135192 -23 36 17.856983592   11.309 10.849     CEMP 18 0
40 TYC 6189-285-1 Pe* 15 38 30.8456260680 -18 04 24.290986440   11.725 10.864 10.58 10.529 CEMP 25 0
41 BD-08 4115 Pe* 15 57 51.8399981688 -08 39 55.102774428   11.689 10.402     CEMP 8 0
42 UCAC2 27497364 Pe* 15 58 29.6299383600 -12 24 34.448910336   13.18 12.33 12.21 11.20 ~ 18 0
43 BD-14 4336 Pe* 16 02 44.9893148568 -15 21 01.653050844   11.224 10.345     ~ 12 0
44 UCAC4 289-085841 Pe* 16 08 06.8076692160 -32 15 59.256359064   13.70 12.65 12.53   ~ 6 0
45 BD-09 4312 Pe* 16 09 51.1806496392 -09 41 17.463800328   11.585 10.488     ~ 13 0
46 UCAC4 501-063456 Pe* 16 10 31.0611750432 +10 03 05.590136412   13.44 12.76 12.64   CEMP 6 0
47 UCAC2 29474930 Pe* 16 18 43.0334179176 -06 30 55.864426572   13.001 12.133 12.03 10.99 ~ 10 0
48 UCAC2 5455272 Pe* 17 09 31.9842672000 -60 27 27.086525640   13.645 12.529 12.28 11.21 CEMP 11 0
49 UCAC4 137-160035 Pe* 17 09 49.2489847008 -62 39 28.542704580   13.828 12.64 12.373   ~ 8 0
50 UCAC4 190-169127 Pe* 17 12 42.8453326464 -52 11 47.912096364   14.25 13.06 12.77   CEMP 6 0
51 UCAC2 1423411 Pe* 17 22 57.4043041968 -71 23 00.029012640   13.813 12.925 12.73 11.83 ~ 15 0
52 UCAC4 120-147487 Pe* 17 25 56.8097568576 -66 03 39.665527560   13.51 12.72 12.66   ~ 6 0
53 UCAC4 193-172653 Pe* 17 27 38.8666694112 -51 33 29.827278144   13.44 12.60 12.37   ~ 5 0
54 UCAC4 078-043871 Pe* 17 28 59.2935880224 -74 27 53.324312940   13.94 13.07 12.97   ~ 6 0
55 UCAC4 194-166570 Pe* 17 33 42.8518599624 -51 21 55.134642276   13.34 12.49 12.32   ~ 4 0
56 CD-60 6745 sg* 17 40 06.8043200232 -61 02 12.857949168   11.093 10.248     G0Ia 21 0
57 UCAC2 8654394 Pe* 17 43 51.1389578904 -53 59 33.356884236   12.858 12.023 11.83 11.00 ~ 14 0
58 UCAC2 13007354 Pe* 18 02 42.2736456576 -44 04 42.648519648   13.851 12.621 12.30 11.26 CEMP 19 0
59 UCAC4 203-173073 Pe* 18 12 10.4591393784 -49 34 49.390479732   13.76 12.63 12.34   CEMP 6 0
60 UCAC4 278-198446 Pe* 18 28 50.8713610368 -34 34 20.442331596   13.78 12.74 12.55   ~ 5 0
61 UCAC4 225-172194 Pe* 18 29 41.2285825680 -45 04 00.134599404   13.70 12.85 12.76   CEMP 6 0
62 UCAC4 128-171197 Pe* 18 36 23.1865551768 -64 28 12.466785108   13.25 12.51 12.36   ~ 9 0
63 TYC 9299-73-1 Pe* 18 36 36.1439913048 -71 36 59.817887748   11.926 10.875     ~ 10 0
64 UCAC4 086-060198 Pe* 18 56 27.7533885504 -72 51 33.077357136   13.73 12.73 12.47   ~ 8 0
65 UCAC4 207-173444 Pe* 19 01 49.5171961728 -48 44 35.959384320   13.38 12.50 12.36   ~ 7 0
66 TYC 8764-1992-1 Pe* 19 16 18.2200707336 -55 44 45.396079728   12.643 11.447     CEMP 20 0
67 UCAC2 13872617 Pe* 19 17 24.0305383656 -42 11 23.997331392   13.764 12.850 12.71 11.69 ~ 8 0
68 UCAC4 118-148434 Pe* 19 17 33.1092002688 -66 28 54.463298088   14.19 13.10 12.79   ~ 5 0
69 UCAC4 118-148541 Pe* 19 20 20.6995328280 -66 27 20.306780892   13.75 12.76 12.49   CEMP 7 0
70 TYC 7943-1023-1 Pe* 19 21 50.7749582376 -44 52 54.462049248   12.622 11.402     CEMP 11 0
71 TYC 8773-230-1 Pe* 19 23 25.1843675280 -58 33 41.047906320   12.759 11.829     CEMP 15 0
72 UCAC2 5977500 Pe* 19 32 48.5823935664 -59 08 02.029636356   14.298 12.753 12.55 11.23 ~ 11 0
73 UCAC2 6703127 Pe* 19 34 54.9730514808 -57 51 39.965760144   14.554 13.131 12.69 11.57 ~ 9 0
74 UCAC2 8419818 Pe* 19 49 40.2618024072 -54 24 11.350436184   13.705 12.75 12.42 11.45 ~ 10 0
75 UCAC2 5726991 Pe* 19 53 49.7804195664 -59 40 00.163242192   13.592 12.620   11.48 KIIvw 54 0
76 UCAC2 21432948 Pe* 19 59 45.5784925848 -25 49 07.593512016   13.346 12.212 12.01 10.92 ~ 8 0
77 UCAC2 17391823 Pe* 20 09 33.9473949192 -34 10 27.350325408   12.67 11.769 11.52 10.21 ~ 12 0
78 UCAC2 7179982 Pe* 20 14 46.0850789208 -56 35 30.061735116   13.343 12.196 12.03 11.09 CEMP 10 0
79 UCAC4 425-121652 SB* 20 16 53.5752887040 -05 03 59.314496112   13.77   12.51   ~ 6 0
80 CD-25 14822 Pe* 20 30 33.3923903040 -25 19 50.247031440   11.679 10.415     CEMP 10 0
81 BPS CS 30336-0121 Pe* 20 31 35.3103516648 -31 27 31.959798552   14.364 13.571 13.49   ~ 15 0
82 UCAC2 31779418 Pe* 20 38 43.1848979784 -00 23 32.761814352   13.726 12.731 12.51 11.57 CEMP 34 0
83 TYC 6921-896-1 Pe* 20 44 55.8565728384 -22 50 59.830521108   12.510 11.242 10.43 9.964 CEMP 10 0
84 UCAC2 9853078 Pe* 20 49 27.6581602104 -51 24 44.055218304   12.659 11.55 11.23 10.34 ~ 13 0
85 UCAC2 4695246 Pe* 20 51 49.7289997320 -61 58 00.927831252   12.98 12.31 12.19 11.61 ~ 9 0
86 TYC 5179-42-1 Pe* 20 54 23.4713454696 -00 33 09.692316936   13.044 11.650     CEMP 12 0
87 HD 358059 Pe* 20 56 09.1348060632 -13 31 17.690158776   11.016 10.192     G0 74 0
88 UCAC4 184-213072 Pe* 21 02 37.5297474264 -53 16 13.210124124       12.66   ~ 5 0
89 HD 200654 Pe* 21 06 34.7513254468 -49 57 50.280288000   9.74 9.1     CEMP 118 0
90 UCAC2 2203606 Pe* 21 06 42.9488737416 -68 28 26.703682860   13.499 12.799 12.74 11.91 CEMP 18 0
91 HD 358246 Pe* 21 09 18.2497595112 -13 10 06.201527160   11.564 10.705     CEMP 16 0
92 2MASS J21095804-0945400 Pe* 21 09 58.0486813872 -09 45 39.988011636   14.495 13.202 12.66 11.638 CEMP 17 0
93 TYC 8801-161-1 Pe* 21 14 13.5027668856 -57 26 36.284002368   11.349 10.546 10.35 9.58 CEMP-no 10 0
94 DENIS J211525.5-150330 Pe* 21 15 25.5129528744 -15 03 30.986562096   13.07   12.16 11.575 CEMP 14 0
95 V* AC Aqr LP* 21 16 21.8575776576 -02 13 41.983196124   11.601 10.247     F8 20 0
96 TYC 8423-827-1 Pe* 21 22 45.9185005416 -46 41 03.114416148   12.74 12.18     ~ 18 0
97 UCAC2 23270810 Pe* 21 26 25.2587621400 -21 44 24.282901068   13.254 12.115 11.91 10.80 CEMP 10 0
98 2MASS J21291592-4236219 Pe* 21 29 15.9278158872 -42 36 21.908234988   13.946 12.964   11.864 ~ 15 0
99 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
100 UCAC4 403-135428 Pe* 21 37 08.0861703360 -09 27 34.614506592   14.505 13.264 12.943   CEMP 16 0
101 HD 207785 Pe* 21 51 35.9489467320 -05 43 39.728427564   10.902 9.973     Fwp 18 0
102 HE 2159-0551 Pe* 22 02 16.3602355800 -05 36 48.534816816   13.3       CEMP-mp 18 0
103 UCAC4 464-129364 Pe* 22 16 35.9639920032 +02 46 16.993943220   13.57 12.77 12.57   CEMP-no 19 0
104 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
105 HD 213575 PM* 22 32 34.0598149056 -06 28 01.831107432   7.62 6.95     G5V 103 0
106 UCAC2 7426974 Pe* 22 44 47.0166923304 -56 17 53.954845584   14.038 12.58 12.29 11.04 CEMP 8 0
107 TYC 6964-83-1 Pe* 22 49 27.5692134888 -22 38 28.941522324   12.999 12.001     ~ 11 0
108 CD-23 17654 SB* 22 53 19.8548690352 -22 48 55.502522964   12.347 11.165     CEMP 11 0
109 BD-16 6190 Pe* 22 59 58.8510661368 -15 54 18.229739796   11.841 10.873     ~ 8 0
110 TYC 9338-874-1 Pe* 23 02 22.8947875320 -68 33 23.350630572   12.276 11.592     ~ 17 0
111 TYC 8011-346-1 Pe* 23 04 49.1331921240 -42 43 47.970356880   13.39 12.25     ~ 12 0
112 HE 2310-4523 Pe* 23 13 00.0416103048 -45 07 06.565285596   12.120 11.207 10.55   CEMP-mp 24 0
113 BD-02 5957 Pe* 23 26 52.5880629288 -01 59 24.689307444   12.61 11.38     CEMP 15 0
114 TYC 5251-615-1 Pe* 23 31 07.1659017456 -02 23 30.140808000   12.606 11.545     CEMP 9 0
115 UCAC4 170-210771 Pe* 23 36 22.0259542968 -56 07 49.766385252   14.133   12.644   CEMP 16 0

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