2015ApJ...807..171J

Query : 2015ApJ...807..171J

2015ApJ...807..171J - Astrophys. J., 807, 171 (2015/July-2)

High-resolution spectroscopic study of extremely metal-poor star candidates from the SkyMapper survey.

JACOBSON H.R., KELLER S., FREBEL A., CASEY A.R., ASPLUND M., BESSELL M.S., DA COSTA G.S., LIND K., MARINO A.F., NORRIS J.E., PENA J.M., SCHMIDT B.P., TISSERAND P., WALSH J.M., YONG D. and YU Q.

Abstract (from CDS):

The SkyMapper Southern Sky Survey is carrying out a search for the most metal-poor stars in the Galaxy. It identifies candidates by way of its unique filter set which allows for estimation of stellar atmospheric parameters. The set includes a narrow filter centered on the Ca ii K 3933 Å line, enabling a robust estimate of stellar metallicity. Promising candidates are then confirmed with spectroscopy. We present the analysis of Magellan Inamori Kyocera Echelle high-resolution spectroscopy of 122 metal-poor stars found by SkyMapper in the first two years of commissioning observations. Forty-one stars have. Nine have, with three at. A 1D LTE abundance analysis of the elements Li, C, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, Zn, Sr, Ba, and Eu shows these stars have [X/Fe] ratios typical of other halo stars. One star with low [X/Fe] values appears to be ''Fe-enhanced,'' while another star has an extremely large [Sr/Ba] ratio: Only one other star is known to have a comparable value. Seven stars are ''CEMP-no'' stars (,). 21 stars exhibit mild r-process element enhancements (), while four stars have. These results demonstrate the ability to identify extremely metal-poor stars from SkyMapper photometry, pointing to increased sample sizes and a better characterization of the metal-poor tail of the halo metallicity distribution function in the future.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances

VizieR on-line data: <Available at CDS (J/ApJ/807/171): table1.dat table2.dat table3.dat table4.dat table7.dat>

Simbad objects: 131

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Number of rows : 131
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 SMSS J000113.96-363337.9 Pe* 00 01 13.9774780560 -36 33 37.973480112           ~ 3 0
2 SMSS J001039.86-525851.4 Pe* 00 10 39.8726217696 -52 58 51.429330588           ~ 3 0
3 SMSS J001952.15-525803.0 Pe* 00 19 52.1646062832 -52 58 03.018141804           ~ 4 0
4 SMSS J002148.06-471132.1 Pe* 00 21 48.0817619688 -47 11 32.119550988           CEMP-no 6 0
5 2MASS J00305580-4820109 Pe* 00 30 55.8144577968 -48 20 10.933611324   14.277 13.392 13.09 12.319 ~ 15 0
6 SMSS J003327.36-491037.9 Pe* 00 33 27.3724152168 -49 10 37.891125012           ~ 4 0
7 SMSS J004037.56-515025.2 Pe* 00 40 37.5651110832 -51 50 25.141528212           ~ 7 0
8 HE 0057-5959 Pe* 00 59 53.9857261680 -59 43 29.745171408   16.4       CEMP-no 39 0
9 SMSS J010332.63-534654.3 Pe* 01 03 32.6276303184 -53 46 54.429581856           ~ 4 0
10 HE 0104-5300 Pe* 01 06 51.9165053832 -52 44 10.577875704   14.382 13.550 13.038 12.518 CEMP-no 18 0
11 Bok I 98B Pe* 01 08 39.5880317064 -28 57 01.512032472   13.278 12.599 12.450   CEMP-r 22 0
12 SMSS J012147.80-495328.2 Pe* 01 21 47.8417302048 -49 53 28.137979572           ~ 1 0
13 SMSS J014624.60-352457.7 Pe* 01 46 24.5911232904 -35 24 57.598222896     12.9     ~ 3 0
14 SMSS J015350.94-775525.6 Pe* 01 53 50.9762027016 -77 55 25.558335408           ~ 2 0
15 SMSS J015941.53-781408.7 Pe* 01 59 41.5394641320 -78 14 08.781755496           ~ 4 0
16 2MASS J02031860-7930291 Pe* 02 03 18.5800198680 -79 30 29.172469320           ~ 6 0
17 SMSS J020748.93-465616.4 Pe* 02 07 48.9359510376 -46 56 16.323543960           ~ 4 0
18 SMSS J021323.26-495936.5 Pe* 02 13 23.2783224168 -49 59 36.495915432           ~ 3 0
19 HD 13979 Pe* 02 15 20.8534060680 -25 54 54.872825148   9.81 9.18     F/Gw 97 0
20 SMSS J022410.38-534659.9 Pe* 02 24 10.3966950408 -53 46 59.874707964           CEMP-no 8 0
21 SMSS J022423.27-573705.1 Pe* 02 24 23.2737498000 -57 37 05.015694000   14.12 13.43 13.41 12.52 ~ 15 0
22 SMSS J022452.58-731051.8 Pe* 02 24 52.5958298496 -73 10 51.725740692           ~ 3 0
23 SMSS J022545.31-774119.9 Pe* 02 25 45.2916341664 -77 41 20.056684704           ~ 2 0
24 SMSS J022756.48-684256.6 Pe* 02 27 56.4858289392 -68 42 56.513499228           ~ 2 0
25 SMSS J023139.43-523957.4 Pe* 02 31 39.4104938040 -52 39 57.215107404           CEMP-no 5 0
26 SMSS J023147.96-575341.7 Pe* 02 31 47.9645500584 -57 53 41.639412876           CEMP-no 7 0
27 SMSS J024643.28-352502.4 Pe* 02 46 43.2806386008 -35 25 02.477082756           CEMP-no 6 0
28 SMSS J024858.41-684306.4 Pe* 02 48 58.4472379200 -68 43 06.218230548           ~ 13 0
29 2MASS J03084611-4747083 Pe* 03 08 46.1084159376 -47 47 08.234387736           ~ 3 0
30 UCAC4 115-002803 Pe* 03 13 00.3747928560 -67 08 39.336144504   15.442 14.753 14.639   CEMP-no 122 0
31 SMSS J031556.09-473442.1 Pe* 03 15 56.1041622792 -47 34 42.109333248           ~ 5 0
32 SMSS J032132.29-363123.6 Pe* 03 21 32.3022733392 -36 31 23.348979660           ~ 4 0
33 SMSS J033005.90-681352.5 Pe* 03 30 05.8931093976 -68 13 52.352223708           CEMP-no 7 0
34 UCAC4 307-003860 Pe* 03 42 49.5250306080 -28 42 15.993435492   15.300 14.482 14.377   ~ 8 0
35 SMSS J040148.04-743537.3 Pe* 04 01 48.0617372184 -74 35 37.382341524           ~ 6 0
36 SMSS J041957.56-493818.3 Pe* 04 19 57.5644079400 -49 38 18.226204188           ~ 3 0
37 UCAC4 264-006015 Pe* 05 10 08.6113975920 -37 20 19.359351492   13.486 12.900 12.830   ~ 12 0
38 BPS CS 31068-0052 Pe* 05 57 46.4866680216 -57 50 57.260880924   14.94 14.31     ~ 3 0
39 SMSS J061725.30-600740.6 Pe* 06 17 25.2919635408 -60 07 40.647425700   15.202 14.388 14.339   CEMP-no 7 0
40 SMSS J062609.83-590503.2 Pe* 06 26 09.8286518496 -59 05 03.067000260           ~ 8 0
41 SMSS J063447.15-622355.0 Pe* 06 34 47.1451190808 -62 23 54.931811784           ~ 11 0
42 SMSS J064349.43-653038.6 Pe* 06 43 49.4084213376 -65 30 38.433384612           ~ 2 0
43 SMSS J065014.40-614328.0 Pe* 06 50 14.4002657016 -61 43 27.870613428           ~ 4 0
44 SMSS J070257.95-600422.4 Pe* 07 02 57.9591360792 -60 04 22.227233844   15.322 14.447 14.264   CEMP-no 6 0
45 SMSS J080050.54-724620.6 Pe* 08 00 50.5223984448 -72 46 20.553200760           ~ 3 0
46 SMSS J085924.06-120104.9 Pe* 08 59 24.0472976736 -12 01 04.930033764           ~ 6 0
47 SMSS J090247.43-122755.0 Pe* 09 02 47.4204784680 -12 27 54.944694144           ~ 3 0
48 SMSS J091210.40-064427.9 Pe* 09 12 10.3999536816 -06 44 27.728463120           ~ 3 0
49 SMSS J093209.41-003435.8 Pe* 09 32 09.4031155512 -00 34 35.839735572           ~ 5 0
50 2MASS J09380777-0600392 Pe* 09 38 07.7708086104 -06 00 39.385116396           ~ 2 0
51 SMSS J093829.27-070520.9 Pe* 09 38 29.2598113896 -07 05 20.614307964           ~ 2 0
52 SMSS J094029.05-060935.0 Pe* 09 40 29.0403518904 -06 09 35.058507336           ~ 4 0
53 UCAC4 398-048552 Pe* 09 47 55.0389374352 -10 27 24.473998980   14.249 13.629 13.516   ~ 5 0
54 SMSS J095120.49-401431.3 Pe* 09 51 20.4906004800 -40 14 31.239032424           ~ 2 0
55 UCAC2 31684370 Pe* 10 02 51.1399139112 -00 01 52.132295136   16.08 15.27 15.02   F5 6 0
56 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
57 2MASS J10242264-2904203 Pe* 10 24 22.6447105344 -29 04 20.382739968           ~ 4 0
58 2MASS J10275895-3006391 Pe* 10 27 58.9543223664 -30 06 39.170208420           ~ 2 0
59 2MASS J10283035-2951115 Pe* 10 28 30.3552210984 -29 51 11.560035636           ~ 6 0
60 2MASS J10294248-0103238 Pe* 10 29 42.4844401224 -01 03 23.995673208           ~ 2 0
61 SMSS J105320.99-435300.1 Pe* 10 53 20.9544100680 -43 52 59.939519700           ~ 3 0
62 SMSS J105438.86-435819.9 Pe* 10 54 38.8544880168 -43 58 19.783957980           ~ 1 0
63 SMSS J110850.60-080034.7 Pe* 11 08 50.5942220184 -08 00 34.127629308           ~ 2 0
64 SMSS J121353.63-441911.2 Pe* 12 13 53.6297005896 -44 19 11.078424588           ~ 1 0
65 SMSS J121716.48-442510.2 Pe* 12 17 16.4794872768 -44 25 10.288038936           ~ 1 0
66 SMSS J122455.61-151134.0 Pe* 12 24 55.6009776792 -15 11 33.897938388           ~ 2 0
67 SMSS J123158.00-162317.6 Pe* 12 31 57.9879346992 -16 23 17.494829484           ~ 2 0
68 SMSS J123246.06-054559.1 Pe* 12 32 46.0674930120 -05 45 59.235041124           CEMP-no 7 0
69 SMSS J125115.37-331448.1 Pe* 12 51 15.3689493000 -33 14 48.116897772           ~ 2 0
70 SMSS J125125.64-340343.4 Pe* 12 51 25.6355208240 -34 03 43.389696096           ~ 2 0
71 SMSS J125451.18-334440.3 Pe* 12 54 51.1789218072 -33 44 40.280619012           ~ 2 0
72 SMSS J125804.65-335045.1 Pe* 12 58 04.6623798864 -33 50 44.983345092           CEMP-no 6 0
73 SMSS J130537.01-294438.3 Pe* 13 05 37.0051981248 -29 44 38.304121848           ~ 2 0
74 UCAC4 232-064708 Pe* 13 30 13.5983879928 -43 46 32.344311504   14.406 13.276 13.063   ~ 7 0
75 SMSS J133532.32-210632.9 Pe* 13 35 32.3165001432 -21 06 32.892063516   14.670 13.828 13.658   ~ 5 0
76 Wolf 1492 Pe* 13 40 02.4921849768 -00 02 18.750053436 11.601 11.832 11.451 11.184 10.892 sdF0: 299 0
77 SMSS J135217.78-151405.7 Pe* 13 52 17.7844967640 -15 14 05.744796540           ~ 2 0
78 SMSS J135625.09-161538.7 Pe* 13 56 25.0778370576 -16 15 38.809377216           ~ 2 0
79 SMSS J135819.95-150937.4 Pe* 13 58 19.9339889712 -15 09 37.427895504           ~ 3 0
80 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
81 SMSS J141547.72-414034.0 Pe* 14 15 47.7138358848 -41 40 34.032470664           ~ 1 0
82 SDSS J142237.43+003105.2 Pe* 14 22 37.4316643608 +00 31 05.282518764           CEMP-no 17 0
83 SMSS J143511.34-420326.5 Pe* 14 35 11.3419735176 -42 03 26.527472316           CEMP-no 7 0
84 SMSS J151101.05-182103.0 Pe* 15 11 01.0553647224 -18 21 02.985458148           ~ 3 0
85 SMSS J151450.18-182946.0 Pe* 15 14 50.1819822744 -18 29 45.975596892           ~ 2 0
86 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 985 0
87 SMSS J155430.57-263904.8 Pe* 15 54 30.5656512240 -26 39 04.811772168           ~ 5 0
88 SMSS J155628.74-165533.4 Pe* 15 56 28.7415476448 -16 55 33.370589460   14.683 13.767 13.678   CEMP-no 5 0
89 SMSS J160447.75-293146.7 Pe* 16 04 47.7562996440 -29 31 46.657695072           ~ 5 0
90 SMSS J164921.94-041943.9 Pe* 16 49 21.9415553520 -04 19 43.920528060           ~ 3 0
91 SMSS J165023.82-252948.7 Pe* 16 50 23.8112976168 -25 29 48.738694488           ~ 2 0
92 SMSS J165219.76-253133.7 Pe* 16 52 19.7871022488 -25 31 33.417571800           ~ 1 0
93 SMSS J173823.36-145701.0 Pe* 17 38 23.3594019264 -14 57 00.811318932           CEMP-no 9 0
94 SMSS J174048.48-143635.6 Pe* 17 40 48.4890462264 -14 36 35.564526936           ~ 1 0
95 SMSS J174916.38-455427.5 Pe* 17 49 16.3828662480 -45 54 27.435029760           ~ 3 0
96 SMSS J174922.26-455103.8 Pe* 17 49 22.2700936200 -45 51 03.878672832           CEMP-no 4 0
97 SMSS J175021.86-414627.2 Pe* 17 50 21.9090739512 -41 46 26.987985408           ~ 3 0
98 SMSS J175046.30-425506.9 Pe* 17 50 46.3020549192 -42 55 06.980208600           ~ 7 0
99 SMSS J175738.37-454823.5 Pe* 17 57 38.3678171352 -45 48 23.497711236           ~ 7 0
100 NGC 6522 GlC 18 03 34.08 -30 02 02.3           ~ 569 0
101 SMSS J183246.49-343434.2 Pe* 18 32 46.4908096320 -34 34 34.182970140           ~ 5 0
102 SMSS J183753.10-380725.9 Pe* 18 37 53.0904964272 -38 07 26.165869320           ~ 2 0
103 SMSS J184226.25-272602.7 Pe* 18 42 26.2432169784 -27 26 02.952830868           ~ 5 0
104 SMSS J184825.29-305929.7 Pe* 18 48 25.2926849136 -30 59 29.594883984           CEMP-no 7 0
105 SMSS J185628.44-231809.8 Pe* 18 56 28.4317543608 -23 18 09.769844808           ~ 1 0
106 SMSS J190549.33-214945.0 Pe* 19 05 49.3335860424 -21 49 45.027845076           CEMP-no 6 0
107 SMSS J190911.03-213207.5 Pe* 19 09 11.0275146600 -21 32 07.380826620           ~ 3 0
108 SMSS J190931.13-214053.9 Pe* 19 09 31.1258051160 -21 40 53.831072172           ~ 5 0
109 SMSS J191802.51-851523.0 Pe* 19 18 02.4250469136 -85 15 22.997450520           ~ 2 0
110 SMSS J193528.46-462129.6 Pe* 19 35 28.4585603688 -46 21 29.456088192           ~ 2 0
111 SMSS J193617.38-790231.4 Pe* 19 36 17.5414070088 -79 02 31.322197608           ~ 2 0
112 SMSS J194432.13-720537.1 Pe* 19 44 32.1433057296 -72 05 37.176036864           ~ 3 0
113 SMSS J195614.75-320145.9 Pe* 19 56 14.7629077248 -32 01 45.918010488           ~ 2 0
114 SMSS J195931.70-643529.3 Pe* 19 59 31.7154456552 -64 35 29.356916820       12.916   ~ 9 0
115 SMSS J200228.85-533114.4 Pe* 20 02 28.8495705888 -53 31 14.412571716       13.701   ~ 9 0
116 SMSS J200654.42-321157.7 Pe* 20 06 54.4341798960 -32 11 57.498559980           ~ 4 0
117 SMSS J202057.49-522417.2 Pe* 20 20 57.4846992168 -52 24 17.152809840       13.554   ~ 6 0
118 SMSS J202123.89-515742.8 Pe* 20 21 23.8951959024 -51 57 42.804810324   14.17 13.27     ~ 6 0
119 SMSS J205313.80-651830.6 Pe* 20 53 13.8172581744 -65 18 30.495839148           ~ 2 0
120 SMSS J210021.85-653627.9 Pe* 21 00 21.8663090928 -65 36 27.734710068           ~ 1 0
121 SMSS J211340.44-520017.5 Pe* 21 13 40.4526843216 -52 00 17.576295516           ~ 2 0
122 BPS CS 22956-0050 Pe* 21 58 05.8340681280 -65 13 27.160682772   14.95 14.25 13.745 13.211 CEMP-no 42 0
123 SMSS J221448.33-453949.9 Pe* 22 14 48.3516819672 -45 39 49.915885536           ~ 5 0
124 SMSS J224838.41-550635.1 Pe* 22 48 38.4175282752 -55 06 35.141564664           ~ 2 0
125 UCAC2 8173367 Pe* 22 48 43.9593527016 -54 36 10.105379640   13.524 12.680 12.56 11.71 ~ 9 0
126 SMSS J225851.25-265434.9 Pe* 22 58 51.2618096904 -26 54 34.908392340           CEMP-no 6 0
127 SMSS J230013.16-263511.0 Pe* 23 00 13.1662844664 -26 35 11.179921920           ~ 4 0
128 SMSS J230113.95-291458.2 Pe* 23 01 13.9609203696 -29 14 58.207253244           ~ 2 0
129 2MASS J23203653-3637223 Pe* 23 20 36.5321231856 -36 37 22.439536284           ~ 1 0
130 2MASS J23261426-3719492 Pe* 23 26 14.2748822808 -37 19 49.243479384           ~ 2 0
131 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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