2020ApJ...898..150E

Query : 2020ApJ...898..150E

2020ApJ...898..150E - Astrophys. J., 898, 150-150 (2020/August-1)

The r-process Alliance: first Magellan/MIKE release from the southern search for r-process-enhanced stars.

EZZEDDINE R., RASMUSSEN K., FREBEL A., CHITI A., HINOJISA K., PLACCO V.M., JI A.P., BEERS T.C., HANSEN T.T., ROEDERER I.U., SAKARI C.M. and MELENDEZ J.

Abstract (from CDS):

Extensive progress has recently been made in our understanding of heavy-element production via the r-process in the universe, specifically with the first observed neutron star binary merger (NSBM) event associated with the gravitational-wave signal detected by LIGO, GW170817. The chemical abundance patterns of metal-poor r-process-enhanced stars provide key evidence for the dominant site(s) of the r-process and whether NSBMs are sufficiently frequent or prolific r-process sources to be responsible for the majority of r-process material in the universe. We present atmospheric stellar parameters (using a nonlocal thermodynamic equilibrium analysis) and abundances from a detailed analysis of 141 metal-poor stars carried out as part of the R-Process Alliance (RPA) effort. We obtained high-resolution "snapshot" spectroscopy of the stars using the MIKE spectrograph on the 6.5 m Magellan Clay telescope at Las Campanas Observatory in Chile. We find 10 new highly enhanced r-II (with [Eu/Fe] > +1.0), 62 new moderately enhanced r-I (+0.3 < [Eu/Fe] <= +1.0), and 17 new limited-r ([Eu/Fe] < +0.3) stars. Among those, we find 17 new carbon-enhanced metal-poor (CEMP) stars, of which five are CEMP-no. We also identify one new s-process-enhanced ([Ba/Eu] > +0.5) and five new r/s (0.0 < [Ba/Eu] < +0.5) stars. In the process, we discover a new ultra-metal-poor (UMP) star at [Fe/H] = -4.02. One of the r-II stars shows a deficit in α and Fe-peak elements, typical of dwarf galaxy stars. Our search for r-process-enhanced stars by RPA efforts has already roughly doubled the known r-process sample.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Population II stars - Chemical abundances - Stellar properties - Stellar types

VizieR on-line data: <Available at CDS (J/ApJ/898/150): table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat>

Simbad objects: 144

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Number of rows : 144
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 UCAC4 467-000028 Pe* 00 01 11.9549326298 +03 21 05.229323957   13.611 12.802 12.554   ~ 4 0
2 TYC 5841-127-1 Pe* 00 10 17.5934312016 -17 35 38.898139920   11.80 11.28     ~ 12 0
3 2MASS J00162809-0505519 Pe* 00 16 28.1078823960 -05 05 51.983148984   13.7       CEMP 11 0
4 UCAC4 442-000436 Pe* 00 19 53.5110561216 -01 45 44.482409100   13.739 12.838 12.784   ~ 4 0
5 2MASS J00282278-3934598 Pe* 00 28 22.8016446414 -39 34 59.874352760           ~ 4 0
6 UCAC2 23529227 Pe* 00 37 27.9356191080 -20 45 30.751084692   13.478 12.642 12.58 11.75 ~ 6 0
7 2MASS J00452379-2112161 Pe* 00 45 23.8045890456 -21 12 16.266038508           ~ 4 0
8 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 233 0
9 BD-11 160 Pe* 00 51 26.4575167968 -10 53 17.293215372   11.22 10.81     ~ 28 0
10 BD-09 174 Pe* 00 52 41.7374945112 -09 02 23.546592636   11.49 10.66     ~ 9 0
11 TYC 8852-851-1 Pe* 01 16 50.0930826096 -63 07 44.146258716   12.406 11.669     ~ 8 0
12 2MASS J01374434-4301490 Pe* 01 37 44.3439411969 -43 01 49.081512301           ~ 4 0
13 2MASS J01473804-1130474 Pe* 01 47 38.0535409416 -11 30 47.355320016   13.892 12.994 12.69 11.992 CEMP 12 0
14 BD+06 281 SB* 01 50 13.4283135768 +07 25 00.978300264   11.99 11.74     G0 5 0
15 2MASS J01553180-4919420 Pe* 01 55 31.8216075319 -49 19 42.075393217           ~ 3 0
16 2MASS J01555066-6400155 Pe* 01 55 50.6561246694 -64 00 15.497567629           ~ 7 0
17 2MASS J02005020-4657352 Pe* 02 00 50.1945484752 -46 57 35.157763908   13.92 13.24 13.17   ~ 7 0
18 TYC 9361-583-1 Pe* 02 11 14.6170625808 -81 07 08.565804372   12.12 11.29     ~ 6 0
19 UCAC2 1550621 * 02 39 53.1931627944 -70 19 01.365352824   13.75 13.10 13.04 12.39 CEMP 8 0
20 ATO J046.9122-05.0469 LP? 03 07 38.9298696543 -05 02 49.106419468   14.443 12.928 12.509   ~ 7 0
21 TYC 9362-1219-1 Pe* 03 15 41.0451253656 -76 26 32.972836668   12.436 11.411     ~ 10 0
22 HE 0324-0122 Pe* 03 27 02.2874129448 +01 32 32.406609948   12.866 12.140 11.934   ~ 15 0
23 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
24 TYC 5309-388-1 Pe* 03 42 36.4736675472 -13 35 53.040620436   12.76 12.19     CEMP 5 0
25 TYC 8875-606-1 Pe* 04 24 56.7724713960 -65 00 17.345372724   12.80 11.47     CEMP 8 0
26 2MASS J04304875-4613535 Pe* 04 30 48.7571178408 -46 13 53.607915732   13.8 13.098 12.693 12.309 ~ 5 0
27 2MASS J05030025-7601462 Pe* 05 03 00.2486486012 -76 01 46.215243952           ~ 5 0
28 TYC 8530-48-1 Pe* 05 20 29.3069942688 -58 25 29.727391260   12.374 11.505     CEMP 13 0
29 2MASS J05241392-0336543 LP* 05 24 13.9298188632 -03 36 54.303249888           ~ 11 0
30 2MASS J05384334-5147228 Pe* 05 38 43.3370560781 -51 47 22.778633031           CEMP 6 0
31 2MASS J05432623-8051334 Pe* 05 43 26.2064841096 -80 51 33.476271431           ~ 3 0
32 TYC 8100-833-1 Pe* 05 57 36.8516367096 -51 27 20.950718364   12.34 11.23 10.55 10.455 CEMP 17 0
33 2MASS J06392518-7414056 Pe* 06 39 25.1808306876 -74 14 05.600375326           ~ 7 0
34 TYC 8123-143-1 Pe* 07 12 33.9894585960 -48 14 04.970112396   12.627 11.566     ~ 13 0
35 2MASS J07150266-0154092 Pe* 07 15 02.6752657654 -01 54 09.069982596           ~ 3 0
36 TYC 8550-279-1 Pe* 07 15 18.5168203560 -52 52 05.137211928   12.958 12.093     ~ 9 0
37 2MASS J07250021-7022038 Pe* 07 25 00.2149617730 -70 22 03.908489337           ~ 3 0
38 TYC 7657-801-1 Pe* 07 44 39.7047923304 -44 25 13.599802812   13.406 12.412     CEMP 13 0
39 DENIS J080254.5-522430 LP? 08 02 54.4966674816 -52 24 30.414470760   14.145 12.375 11.80 10.29 ~ 8 0
40 2MASS J08295142-7242542 Pe* 08 29 51.4456428032 -72 42 54.208765617           ~ 1 0
41 2MASS J09103481+0518228 Pe* 09 10 34.8174822902 +05 18 22.890491335           ~ 2 0
42 BD+09 2190 Pe* 09 29 15.5615542183 +08 38 00.467004388   11.54   10.8   sdA5 144 0
43 2MASS J09531322+0744515 Pe* 09 53 13.2249812065 +07 44 51.672898714           ~ 2 0
44 2MASS J10063414-7030212 Pe* 10 06 34.1495399098 -70 30 21.293474194           ~ 3 0
45 2MASS J10073075+0348357 Pe* 10 07 30.7689813161 +03 48 35.793387058           ~ 4 0
46 2MASS J10524610-0336012 Pe* 10 52 46.1062745393 -03 36 01.153360077           ~ 9 0
47 ASAS J105506+1932.0 LP* 10 55 06.5892560304 +19 31 57.929249676           C-H 6 0
48 UCAC2 1106907 Pe* 11 16 54.0105851184 -72 50 16.112976072   13.171 11.41 10.92 9.61 CEMP 14 0
49 UCAC4 370-060728 Pe* 11 19 12.3299558904 -16 09 46.737380340   13.136 12.371 12.130   CEMP 15 0
50 2MASS J11303693+0224037 Pe* 11 30 36.9488785026 +02 24 03.681599591           ~ 3 0
51 TYC 275-283-1 Pe* 11 47 10.2515448336 +03 41 26.599710948   12.61 12.03 12.58   ~ 10 0
52 UCAC2 1711838 Pe* 11 51 02.2665951744 -69 40 41.670223176   13.261 11.889 11.54 10.32 CEMP 8 0
53 UCAC4 467-046018 Pe* 11 56 55.3804639296 +03 20 33.008762256   15.08 14.06 13.89   ~ 5 0
54 2MASS J12170829+0415146 Pe* 12 17 08.2865209964 +04 15 14.565498261           ~ 12 0
55 2MASS J12203297+0257138 Pe* 12 20 32.9823766524 +02 57 13.914411847           ~ 3 0
56 2MASS J12233047-4216365 Pe* 12 23 30.4758837360 -42 16 36.578043300           ~ 2 0
57 2MASS J12255123-2351074 Pe* 12 25 51.2320886264 -23 51 07.691804232           ~ 3 0
58 TYC 1446-785-1 Pe* 12 33 16.7008643808 +16 22 56.356729824   12.93 12.17     ~ 2 0
59 2MASS J12351734+0945333 Pe* 12 35 17.3452177801 +09 45 33.260589897           ~ 1 0
60 UCAC2 1491417 Pe* 12 59 14.6288278872 -70 49 59.314926216   13.897 12.351 11.99 10.66 CEMP 10 0
61 UCAC4 392-055956 Pe* 13 05 21.3746981808 -11 37 22.078035876   14.305 13.370 13.350   CEMP 15 0
62 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
63 UCAC4 402-054869 RG* 13 26 17.9206079664 -09 45 17.612887752   14.097 13.284 13.215 12.305 ~ 18 0
64 2MASS J13273676-1710384 Pe* 13 27 36.7700176464 -17 10 38.500016124   13.27 12.53     ~ 9 0
65 2MASS J13275198+0342396 Pe* 13 27 51.9895567437 +03 42 39.572402752           ~ 2 0
66 2MASS J13373017-7717500 Pe* 13 37 30.1836632390 -77 17 50.064331417           ~ 4 0
67 UCAC2 892538 Pe* 13 49 47.1343553784 -74 23 39.529575168   13.475 12.453 12.23 11.20 ~ 12 0
68 UCAC4 082-032305 Pe* 13 51 15.3997994784 -73 40 36.399688464   14.082   13.018   ~ 7 0
69 UCAC4 515-056076 Pe* 13 52 48.3529857788 +12 54 21.523917638   13.727 12.889 12.732   ~ 3 0
70 2MASS J13554406-3750455 Pe* 13 55 44.0597243647 -37 50 45.519377676           ~ 3 0
71 2MASS J13592232-6821493 Pe* 13 59 22.3622559225 -68 21 49.386192547           ~ 1 0
72 2MASS J14100568-0701443 Pe* 14 10 05.6949277591 -07 01 44.347842463           ~ 3 0
73 2MASS J14112614-1137453 Pe* 14 11 26.1475305408 -11 37 45.253452864   13.818 12.370 11.73 10.793 CEMP 17 0
74 TYC 7809-2264-1 Pe* 14 23 43.7160463536 -40 25 52.592345616   12.87 12.17     ~ 1 0
75 TYC 5572-335-1 Pe* 14 33 55.9293287616 -12 40 35.683828752   12.911 11.575 10.771 10.240 ~ 6 0
76 UCAC4 414-058324 Pe* 14 35 58.5107736672 -07 19 26.557270212   13.686 12.877 12.924   CEMP 4 0
77 UCAC4 384-066066 Pe* 14 44 30.1429101144 -13 20 09.343689864   13.905 13.032 13.036   ~ 5 0
78 L 478-23 Pe* 14 53 32.6725120416 -36 14 55.625943516   12.26 11.74     ~ 4 0
79 2MASS J14534137+0040467 Pe* 14 53 41.3850769450 +00 40 46.749390235           ~ 6 0
80 UCAC4 493-062753 Pe* 14 54 37.9364342572 +08 30 37.815955205   13.583 12.783 12.557   ~ 6 0
81 TYC 6168-336-1 Pe* 14 56 45.5664343896 -16 15 43.201795104   12.390 11.782     ~ 6 0
82 2MASS J14590234-0916105 Pe* 14 59 02.3509101510 -09 16 10.485056513           ~ 4 0
83 2MASS J15013452-2443310 Pe* 15 01 34.5248875569 -24 43 30.995084830           ~ 2 0
84 2MASS J15042611-2231523 Pe* 15 04 26.1022933311 -22 31 52.230874658           ~ 1 0
85 2MASS J15133549-1244339 Pe* 15 13 35.4904222632 -12 44 34.077296220   13.573 12.742 12.59 11.688 CEMP 13 0
86 2MASS J15204531-1742486 Pe* 15 20 45.3115704972 -17 42 48.728338767           ~ 2 0
87 2MASS J15240713-0319509 Pe* 15 24 07.1400584260 -03 19 51.002438791           ~ 2 0
88 2MASS J15272126-1445153 Pe* 15 27 21.2673423524 -14 45 15.294576777           ~ 1 0
89 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 985 0
90 UCAC2 286531 Pe* 16 11 56.6821797672 -80 34 42.297390732   14.16   12.95 11.69 CEMP 8 0
91 CPD-56 7495 Pe* 16 16 35.9783757624 -57 00 57.227419188   11.40 10.71     ~ 6 0
92 UCAC2 2187586 Pe* 16 59 21.7447579848 -68 27 19.827981684   14.296 13.100 12.77 11.76 ~ 8 0
93 2MASS J17043634-6219457 Pe* 17 04 36.2915965825 -62 19 46.107055090           ~ 1 0
94 2MASS J17060555+0412354 Pe* 17 06 05.5500990480 +04 12 35.423583624           ~ 3 0
95 UCAC4 059-023588 Pe* 17 07 07.5851685264 -78 17 56.107979700   13.662 12.775 12.627   ~ 6 0
96 UCAC4 094-068802 Pe* 17 13 19.7536975224 -71 13 01.094371392   13.478 12.616 12.397   ~ 4 0
97 UCAC4 100-092660 Pe* 17 16 33.4048844664 -70 09 02.832579792   14.144 13.133 12.878   CEMP-r 8 0
98 2MASS J17360167-5145296 Pe* 17 36 01.6756105478 -51 45 29.634232785           ~ 2 0
99 UCAC4 191-184724 Pe* 17 54 15.6122469305 -51 48 26.860301249   13.915 12.896 12.585   ~ 4 0
100 UCAC4 166-202248 Pe* 18 27 24.3211083840 -56 55 16.628004876   13.758 12.597 12.325   ~ 3 0
101 TYC 9527-1073-1 SB* 18 28 43.5444877872 -84 41 34.807937568   12.854 11.527     ~ 8 0
102 UCAC2 10750221 Pe* 18 29 43.5957543384 -49 24 25.262159688   13.976 12.762 12.52 11.46 CEMP 10 0
103 2MASS J18332056-3802590 Pe* 18 33 20.5686728263 -38 02 58.930940863           ~ 1 0
104 UCAC2 10974918 Pe* 18 33 31.8822609432 -48 40 40.424756916   13.417 12.64 12.53 11.69 ~ 7 0
105 UCAC2 989194 Pe* 18 36 12.1452281712 -73 33 44.266568472   12.843 11.799 11.59 10.57 CEMP 10 0
106 2MASS J18405985-4841353 Pe* 18 40 59.8598618856 -48 41 35.314100052   13.83 13.00 12.84   ~ 5 0
107 UCAC4 130-172729 SB* 18 56 03.5997798259 -64 03 46.510822217       12.556   ~ 3 0
108 UCAC4 192-189715 Pe* 19 09 26.7765870807 -51 40 20.899958512     12.835 12.553   ~ 6 0
109 2MASS J19105886-4059412 Pe* 19 10 58.8594220587 -40 59 41.115786381           ~ 1 0
110 CD-54 8237 Pe* 19 17 55.8562797552 -54 40 14.805407208   11.568 10.763     CEMP-no 11 0
111 TYC 8772-745-1 SB* 19 19 27.6801156336 -59 59 14.035004556   11.841 10.523     CEMP 10 0
112 UCAC2 21882851 Pe* 19 28 21.6354525072 -24 57 54.712912608   13.533 12.600 12.41 11.42 CEMP 7 0
113 UCAC2 7906014 Pe* 19 29 19.0991557368 -55 28 18.190203996   14.116 12.842 12.57 11.48 CEMP 9 0
114 UCAC2 16072090 Pe* 19 31 04.2722229264 -37 07 39.820757988   14.00 12.78 12.49 11.46 ~ 6 0
115 V* EQ Pav RV* 19 32 04.4750968752 -73 09 17.956140192   11.464 10.22     G0e? 16 0
116 TYC 7443-1458-1 Pe* 19 50 49.8992452320 -33 21 10.772862372   13.247 12.272     ~ 8 0
117 2MASS J19532495-3647303 Pe* 19 53 24.9630659989 -36 47 30.480206601           ~ 1 0
118 TYC 8391-2145-1 Pe* 19 55 21.5805472944 -46 13 56.959496796   12.883 11.900 11.56 10.81 CEMP 19 0
119 UCAC2 14521355 Pe* 19 56 38.2150493136 -40 54 23.584476204   12.164 11.590 11.49 10.75 ~ 6 0
120 UCAC2 17842928 Pe* 19 57 08.9307969504 -33 17 32.019929088   13.491 12.405 12.21 11.14 ~ 8 0
121 TYC 8400-411-1 Pe* 20 03 55.3164703272 -50 28 10.076799504   12.775 11.927     ~ 8 0
122 BPS CS 22873-0166 Pe* 20 19 22.0362485016 -61 30 15.119987544   12.818 11.802 11.52 10.57 KIIvw 62 0
123 TYC 6914-800-1 Pe* 20 20 29.1778364280 -27 07 34.815333828   11.991 11.172     CEMP-r 11 0
124 2MASS J20234398-0815472 Pe* 20 23 43.9854164407 -08 15 47.264545554           ~ 3 0
125 UCAC2 20983981 Pe* 20 24 21.2295915504 -26 56 43.636308936   14.041 12.878 12.66 11.56 ~ 10 0
126 UCAC2 7910664 Pe* 20 37 40.4228537064 -55 20 50.043626628   13.62 12.74 12.58 11.68 CEMP 8 0
127 UCAC2 16079915 Pe* 20 44 50.6511374640 -37 14 00.059167896   13.483 12.350 12.10 11.07 CEMP 12 0
128 2MASS J20501790-0549230 Pe* 20 50 17.8905728582 -05 49 23.374594139           ~ 2 0
129 UCAC2 25221731 Pe* 20 58 55.0399546368 -17 59 00.741506640   13.283 12.392 12.31 11.26 ~ 7 0
130 2MASS J21220020-0820333 Pe* 21 22 00.2040007417 -08 20 33.324482620           ~ 2 0
131 UCAC4 407-134619 Pe* 21 23 45.8836139400 -08 39 45.176434848   13.488   11.898 10.823 ~ 13 0
132 2MASS J21352343-5722598 Pe* 21 35 23.4391898033 -57 22 59.778220681           ~ 5 0
133 2MASS J21553580-0905118 Pe* 21 55 35.8130634486 -09 05 11.796362802           ~ 4 0
134 2MASS J22182082-3827554 Pe* 22 18 20.8318448784 -38 27 55.460957580   14.0 13.4     ~ 7 0
135 TYC 7502-701-1 Pe* 22 21 57.9449028024 -36 02 09.116970216   12.54 11.88     ~ 2 0
136 TYC 9483-657-1 Pe* 22 22 03.4690643904 -80 24 59.200830684   12.884 11.793     CEMP 10 0
137 TYC 6391-1124-1 Pe* 22 25 34.4341992456 -20 27 17.157608172   12.97 12.59     ~ 4 0
138 UCAC4 133-185399 Pe* 22 30 02.3801921544 -63 32 19.111719444   13.853 13.080 12.889   ~ 3 0
139 2MASS J22302641-1949527 Pe* 22 30 26.4222025608 -19 49 52.860805392   13.88 12.83     CEMP 6 0
140 UCAC4 408-143929 Pe* 22 34 42.0305040048 -08 26 49.390761372   13.107 12.342 12.238   ~ 11 0
141 TYC 9124-1353-1 Pe* 22 34 54.4618230672 -66 05 17.159929476   12.27 11.38     ~ 11 0
142 UCAC4 410-143255 Pe* 22 39 48.2676993072 -08 03 53.649230652   14.48 13.18 12.94   ~ 5 0
143 UCAC2 571434 Pe* 23 10 03.2119609008 -77 02 16.575152208   12.954 11.966 11.80 10.93 ~ 11 0
144 UCAC2 3613819 Pe* 23 41 15.8197411728 -64 06 44.088256584   13.606 12.790 12.69 11.80 ~ 11 0

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