2012ApJ...754...91L

Query : 2012ApJ...754...91L

2012ApJ...754...91L - Astrophys. J., 754, 91 (2012/August-1)

Chemical and kinematical properties of blue straggler stars and horizontal branch stars in NGC 6397.

LOVISI L., MUCCIARELLI A., LANZONI B., FERRARO F.R., GRATTON R., DALESSANDRO E. and CONTRERAS RAMOS R.

Abstract (from CDS):

We used three sets of high-resolution spectra acquired with the multifiber facility FLAMES at the Very Large Telescope of the European Southern Observatory to investigate the chemical and kinematical properties of a sample of 42 horizontal branch (HB) stars, 18 blue straggler stars (BSSs), and 86 main-sequence (MS) turnoff (TO) and sub-giant branch stars in the nearby globular cluster NGC 6397. We measured rotational velocities and Fe, O, and Mg abundances. All of the unevolved stars in our sample have low rotational velocites (vsin i < 10 km/s), while the HB stars and BSSs show a broad distribution, with values ranging from 0 to ∼70 km/s. For HB stars with T < 10,500 K there is a clear temperature-oxygen anticorrelation that can be understood if the star position along the HB is mainly determined by the He content. The hottest BSSs and HB stars (with temperatures T > 8200 K and T > 10,500 K, respectively) also show significant deviations in their iron abundance with respect to the cluster metallicity (as traced by the unevolved stars, [Fe/H] = -2.12). While similar chemical patterns have already been observed in other hot HB stars, this is the first evidence ever collected for BSSs. We interpret these abundance anomalies as due to the metal radiative levitation, occurring in stars with shallow or no convective envelopes.

Abstract Copyright: ∼

Journal keyword(s): blue stragglers - globular clusters: individual: NGC 6397 - stars: abundances - stars: evolution - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJ/754/91): table2.dat table3.dat table4.dat>

Nomenclature: Tables 2-4: [LML2012] NNNNNNN N=146

Simbad objects: 156

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Number of rows : 156
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3917 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7067 0
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1430 0
4 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1420 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3427 0
6 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1850 0
7 [LML2012] 41662 * 17 39 22.1447847720 -53 38 23.494597152     15.83   14.85 ~ 1 0
8 [LML2012] 43151 * 17 39 22.5979996320 -53 35 52.761687108     16.05   15.13 ~ 1 0
9 [LML2012] 41395 * 17 39 22.741 -53 38 51.90     15.79   14.76 ~ 1 0
10 2MASS J17393795-5340531 RG* 17 39 37.9629703800 -53 40 53.233347648     15.935   15.01 ~ 3 0
11 [LML2012] 54581 * 17 39 38.8719773496 -53 38 07.333897992     16.15   15.28 ~ 1 0
12 [LML2012] 55400 * 17 39 39.8476986888 -53 37 07.359162672     15.64   14.61 ~ 1 0
13 [LML2012] 18705 BS* 17 39 40.3578061008 -53 30 55.479352356     15.55   15.16 ~ 1 0
14 [LML2012] 17909 * 17 39 40.8985364832 -53 32 55.906942920     16.26   15.43 ~ 1 0
15 [LML2012] 56930 * 17 39 41.6371576632 -53 34 56.929700100     16.00   15.08 ~ 1 0
16 2MASS J17394297-5339253 RG* 17 39 42.9863760576 -53 39 25.445301660     16.231   15.39 ~ 3 0
17 2MASS J17394372-5340506 RG* 17 39 43.7301630552 -53 40 50.711224728   16.44 15.966   15.05 ~ 4 0
18 2MASS J17394474-5339465 RG* 17 39 44.7646902408 -53 39 46.606485780     16.263   15.41 ~ 3 0
19 [LML2012] 51874 HB* 17 39 51.1892530176 -53 41 20.722482024     13.77   13.56 ~ 2 0
20 [LML2012] 53805 HB* 17 39 51.3307460952 -53 39 05.648765472     13.30   13.00 ~ 2 0
21 2MASS J17395282-5337028 * 17 39 52.8297420264 -53 37 03.046201500     16.17   15.31 ~ 2 0
22 2MASS J17395471-5337401 * 17 39 54.7146977232 -53 37 40.302857856     15.97   15.05 ~ 2 0
23 2MASS J17395491-5342240 RG* 17 39 54.9206759256 -53 42 24.298961220     16.171   15.31 ~ 4 0
24 Cl* NGC 6397 GVS 793 HB* 17 39 55.9063498560 -53 35 11.987646072   16.090 15.551   14.56 ~ 9 0
25 2MASS J17395678-5340298 RG* 17 39 56.7916070952 -53 40 29.965931076     15.954   15.08 ~ 4 0
26 2MASS J17395770-5338394 RG* 17 39 57.7147411536 -53 38 39.621849252     15.832   14.89 ~ 4 0
27 2MASS J17395891-5343160 RG* 17 39 58.9163061408 -53 43 16.161291084     15.976   15.09 ~ 4 0
28 2MASS J17395945-5338382 * 17 39 59.4565391496 -53 38 38.347441548     15.60   14.57 ~ 2 0
29 NGC 6397 26 HB* 17 39 59.4974161944 -53 35 53.380247712   13.63 13.46   13.15 ~ 7 0
30 2MASS J17400078-5335350 * 17 40 00.7817318400 -53 35 35.159697384     15.98   15.09 ~ 2 0
31 2MASS J17400120-5337527 * 17 40 01.2172460496 -53 37 52.801123476     16.12   15.26 ~ 2 0
32 2MASS J17400152-5343467 RG* 17 40 01.5245688048 -53 43 46.863165288     15.932   14.98 ~ 4 0
33 2MASS J17400157-5336494 * 17 40 01.5843653640 -53 36 49.369093272     15.73   14.73 ~ 2 0
34 2MASS J17400295-5335356 * 17 40 02.9621459928 -53 35 35.659420296     15.97   15.07 ~ 2 0
35 2MASS J17400311-5336468 * 17 40 03.1270930848 -53 36 46.954456920     15.69   14.68 ~ 2 0
36 [LML2012] 18540 HB* 17 40 03.2778668184 -53 31 18.450064956     13.23   12.93 ~ 3 0
37 2MASS J17400332-5342468 RG* 17 40 03.3243491736 -53 42 46.891680660     16.229   15.38 ~ 4 0
38 2MASS J17400376-5345095 * 17 40 03.7638580416 -53 45 09.551373912     16.22   15.36 ~ 2 0
39 2MASS J17400430-5339303 RG* 17 40 04.303 -53 39 30.33     15.971   15.09 ~ 4 0
40 2MASS J17400434-5343058 * 17 40 04.3406404560 -53 43 05.939050440     16.03   15.12 ~ 2 0
41 2MASS J17400478-5345307 * 17 40 04.7770217184 -53 45 30.745705140     15.96   15.03 ~ 2 0
42 2MASS J17400493-5340247 * 17 40 04.932 -53 40 24.77     15.67   14.66 ~ 2 0
43 2MASS J17400543-5338198 RG* 17 40 05.4383957304 -53 38 19.899666420     16.119   15.26 ~ 4 0
44 2MASS J17400635-5342090 RG* 17 40 06.354 -53 42 09.05   16.48 15.973   15.07 ~ 5 0
45 2MASS J17400640-5345360 * 17 40 06.3999733704 -53 45 36.124990344     16.00   15.09 ~ 2 0
46 NGC 6397 29 HB* 17 40 06.8859204696 -53 34 44.922826164     13.55   13.28 ~ 5 0
47 [BH2018] J265.030000-53.583306 * 17 40 07.2105775608 -53 34 59.946698136     16.26   15.42 ~ 2 0
48 2MASS J17400749-5344476 * 17 40 07.4922301992 -53 44 47.627541456     16.09   15.22 ~ 2 0
49 2MASS J17400841-5342515 RG* 17 40 08.4076426512 -53 42 51.711498612     15.934   15.02 ~ 4 0
50 2MASS J17400842-5341351 * 17 40 08.42400 -53 41 35.1888     15.62   14.61 ~ 2 0
51 2MASS J17400952-5334260 * 17 40 09.5409348144 -53 34 26.100340176     15.99   15.10 ~ 2 0
52 2MASS J17401067-5337413 * 17 40 10.6867477944 -53 37 41.341898100     16.20   15.35 ~ 2 0
53 [BH2018] J265.047833-53.646000 * 17 40 11.463 -53 38 45.36     16.15   15.28 ~ 2 0
54 2MASS J17401170-5344305 * 17 40 11.704 -53 44 30.58     15.51   14.46 ~ 2 0
55 2MASS J17401242-5340418 * 17 40 12.425 -53 40 41.85     15.60   14.60 ~ 2 0
56 2MASS J17401262-5343411 * 17 40 12.6192546672 -53 43 41.245306320     16.31   15.47 ~ 2 0
57 2MASS J17401325-5339538 * 17 40 13.2609527568 -53 39 53.905878396     15.87   14.91 ~ 2 0
58 2MASS J17401371-5345365 * 17 40 13.7146835832 -53 45 36.533579904     15.77   14.78 ~ 2 0
59 2MASS J17401372-5339153 RG* 17 40 13.7204045136 -53 39 15.489134244     16.238   15.43 ~ 4 0
60 2MASS J17401402-5339330 * 17 40 14.022 -53 39 33.07     16.32   15.48 ~ 2 0
61 NGC 6397 135 HB* 17 40 15.3889980408 -53 38 47.500286712     13.64   13.37 ~ 5 0
62 2MASS J17401585-5334362 * 17 40 15.8511686664 -53 34 36.311981592     15.98   15.09 ~ 2 0
63 2MASS J17401616-5338570 * 17 40 16.1803472784 -53 38 57.203025396     16.29   15.44 ~ 2 0
64 2MASS J17401674-5335117 * 17 40 16.7485907592 -53 35 11.751032256     15.83   14.89 ~ 2 0
65 [LML2012] 46551 * 17 40 17.2048612272 -53 48 24.547662900     16.22   15.35 ~ 1 0
66 2MASS J17401804-5342483 * 17 40 18.0434359776 -53 42 48.364337808     16.04   15.16 ~ 2 0
67 2MASS J17401809-5344576 * 17 40 18.0962958528 -53 44 57.639948360     16.15   15.30 ~ 2 0
68 2MASS J17401835-5344386 * 17 40 18.351 -53 44 38.61     16.08   15.24 ~ 2 0
69 2MASS J17401964-5345234 * 17 40 19.6516662576 -53 45 23.481289692     15.95   15.05 ~ 2 0
70 2MASS J17401990-5339489 RG* 17 40 19.9133032536 -53 39 49.106111616     16.010   15.16 ~ 4 0
71 [BH2018] J265.083750-53.696417 * 17 40 20.1077286600 -53 41 47.197378284     16.22   15.38 ~ 2 0
72 2MASS J17402036-5343185 RG* 17 40 20.365 -53 43 18.57     15.821   14.90 ~ 4 0
73 2MASS J17402104-5340011 * 17 40 21.0484607064 -53 40 01.248930624     15.84   14.93 ~ 3 0
74 2MASS J17402135-5341433 RG* 17 40 21.351 -53 41 43.39     16.043   15.19 ~ 4 0
75 2MASS J17402139-5343054 RG* 17 40 21.3897894864 -53 43 05.413614852   16.50 15.988   15.12 ~ 5 0
76 2MASS J17402180-5343565 * 17 40 21.8045953248 -53 43 56.694724644     15.79   14.82 ~ 2 0
77 2MASS J17402200-5335222 * 17 40 22.0124788488 -53 35 22.266633084     16.00   15.10 ~ 2 0
78 2MASS J17402205-5337540 * 17 40 22.0635926832 -53 37 54.215481900     15.93   15.01 ~ 2 0
79 2MASS J17402574-5335209 * 17 40 25.7470253136 -53 35 21.010525116     15.93   14.99 ~ 2 0
80 NGC 6397 101 HB* 17 40 27.3069728088 -53 37 38.979995340     13.31   13.02 ~ 4 0
81 2MASS J17402742-5336537 * 17 40 27.4390386264 -53 36 53.908676532     16.33   15.53 ~ 2 0
82 2MASS J17402876-5333558 * 17 40 28.7698664424 -53 33 55.816841088     16.24   15.43 ~ 2 0
83 2MASS J17402901-5337422 * 17 40 29.0240611752 -53 37 42.385984392     15.88   14.95 ~ 2 0
84 NGC 6397 39 HB* 17 40 29.4633856560 -53 35 16.493898768     13.41   13.16 ~ 6 0
85 2MASS J17403077-5344011 * 17 40 30.7831674048 -53 44 01.333474476     16.00   15.14 ~ 2 0
86 2MASS J17403103-5345519 * 17 40 31.0427617368 -53 45 51.935334048     15.85   14.95 ~ 2 0
87 2MASS J17403151-5337032 * 17 40 31.5269853696 -53 37 03.334982484     15.81   14.86 ~ 2 0
88 2MASS J17403184-5334144 * 17 40 31.8322088616 -53 34 14.372493600     16.21   15.40 ~ 2 0
89 Cl* NGC 6397 ABCPO 1687 BS* 17 40 31.8334832712 -53 44 23.936242236   15.34 14.99   14.55 ~ 4 0
90 [LML2012] 12158 HB* 17 40 32.1030658152 -53 26 32.803747116     13.72   13.52 ~ 3 0
91 2MASS J17403221-5337426 * 17 40 32.219 -53 37 42.66     15.91   14.97 ~ 2 0
92 2MASS J17403263-5343417 * 17 40 32.6324842944 -53 43 41.856727656     16.04   15.19 ~ 2 0
93 2MASS J17403360-5347524 * 17 40 33.6181535424 -53 47 52.500926904     16.22   15.39 ~ 2 0
94 2MASS J17403398-5337148 * 17 40 33.984 -53 37 14.85     16.33   15.52 ~ 2 0
95 [LML2012] 2200028 HB* 17 40 34.1894848944 -53 39 20.887171380     13.54   13.29 ~ 2 0
96 Cl* NGC 6397 GVS 206810 * 17 40 34.5834591072 -53 33 20.863550880   16.058 15.514   14.54 ~ 8 0
97 [LML2012] 11363 HB* 17 40 34.6366251000 -53 28 49.084317840     13.73   13.51 ~ 2 0
98 2MASS J17403641-5346476 * 17 40 36.4133100600 -53 46 47.812232316     15.98   15.16 ~ 2 0
99 [LML2012] 65798 HB* 17 40 36.7761596952 -53 43 38.403952824     13.50   13.24 ~ 2 0
100 2MASS J17403705-5344177 * 17 40 37.05720 -53 44 17.7288     15.83   14.90 ~ 2 0
101 2MASS J17403716-5337294 * 17 40 37.16808 -53 37 29.4924     15.60   14.58 ~ 2 0
102 Cl* NGC 6397 LOAM 11 SX* 17 40 37.525 -53 40 36.13   16.33 15.97   15.46 ~ 11 0
103 [HKD2016] 2553 BS* 17 40 37.5708813935 -53 41 35.023121695     15.66   15.03 ~ 2 0
104 [LML2012] 65209 * 17 40 37.922 -53 44 02.71     15.87   14.98 ~ 1 0
105 Cl* NGC 6397 SAW V8 EB* 17 40 39.2669740848 -53 38 46.931702352   16.72 16.28   15.76 ~ 11 1
106 Cl* NGC 6397 LOAM 16 SX* 17 40 39.312 -53 40 46.61   16.21 15.66   15.14 ~ 6 0
107 GSC 08729-01817 HB* 17 40 39.4565269128 -53 45 13.687316028     13.10   12.80 ~ 3 0
108 NGC 6397 44 HB* 17 40 39.6009439080 -53 34 09.962507568   13.45 13.27   12.89 A0p 6 0
109 NGC 6397 45 HB* 17 40 39.8052361848 -53 34 39.028916676     13.77   13.55 ~ 6 0
110 [LML2012] 1100024 HB* 17 40 40.3499870040 -53 40 54.068096208     13.54   13.37 ~ 2 0
111 2MASS J17404174-5344410 * 17 40 41.7401790408 -53 44 41.028377820     15.89   14.99 ~ 2 0
112 2MASS J17404206-5346456 * 17 40 42.0654917736 -53 46 45.759191520     15.19   14.15 ~ 2 0
113 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1976 0
114 [LML2012] 76738 HB* 17 40 42.1501744296 -53 38 09.022688520     13.61   13.37 ~ 2 0
115 Cl* NGC 6397 DSZ 3 BS* 17 40 42.1871355917 -53 40 28.470933331 14.340 14.67 14.54   14.35 ~ 4 0
116 [BH2018] J265.177500-53.646139 BS* 17 40 42.6228140136 -53 38 46.399719444     15.18   14.70 ~ 2 0
117 NGC 6397 604 HB* 17 40 42.6542792712 -53 47 04.408062324     13.55   13.34 ~ 7 0
118 [LML2012] 1100191 BS* 17 40 43.607 -53 40 27.58     15.78   15.19 ~ 1 0
119 [LML2012] 1100029 HB* 17 40 43.735 -53 41 05.92     13.64   13.43 ~ 2 0
120 Cl* NGC 6397 GVS 669 * 17 40 43.7537697168 -53 37 17.519866212   15.899 15.339   14.34 ~ 8 0
121 Cl* NGC 6397 V W HB* 17 40 43.9060970016 -53 31 00.576235596   12.91 13.72   13.49 ~ 3 0
122 Cl* NGC 6397 LOAM 9 SX* 17 40 44.107 -53 40 40.43   15.75 15.40   14.88 ~ 14 0
123 Cl* NGC 6397 LOAM 10 SX* 17 40 45.389 -53 40 24.88   15.78 15.43   14.93 ~ 7 0
124 2MASS J17404542-5334173 * 17 40 45.4319003040 -53 34 17.605981632     16.23   15.39 ~ 2 0
125 [LML2012] 1100208 BS* 17 40 46.569 -53 40 09.70     15.78   15.39 ~ 1 0
126 [LML2012] 76330 HB* 17 40 47.761 -53 38 22.56     13.53   13.29 ~ 4 0
127 2MASS J17404779-5339515 RG* 17 40 47.8107166536 -53 39 51.685430256     13.43   13.20 ~ 4 0
128 [BH2018] J265.210042-53.692417 BS* 17 40 50.4394209864 -53 41 32.941468104     15.62   15.22 ~ 2 0
129 Cl* NGC 6397 ABCPO 251 BS* 17 40 53.1308373264 -53 35 56.467068540   15.59 15.37   15.06 ~ 4 0
130 Cl* NGC 6397 ABCPO 711 BS* 17 40 54.6654163656 -53 38 57.066222948   16.39 15.95   15.37 ~ 3 0
131 [LML2012] 81828 BS* 17 40 54.8811983904 -53 34 19.356352680     15.19   14.76 ~ 1 0
132 [LML2012] 64937 HB* 17 40 55.8654018336 -53 44 16.239878808     13.43   13.17 ~ 3 0
133 2MASS J17405746-5340000 HB* 17 40 57.46248 -53 40 00.0876     13.12   12.76 ~ 2 0
134 NGC 6397 187 HB* 17 40 57.5994216048 -53 37 56.443103580   13.616 13.57   13.33 ~ 5 0
135 [LML2012] 82561 HB* 17 41 00.1028195520 -53 33 36.978728832     13.56   13.31 ~ 2 0
136 [LML2012] 74883 HB* 17 41 01.1331471144 -53 39 08.220743856     13.47   13.21 ~ 3 0
137 2MASS J17410181-5339555 HB* 17 41 01.81584 -53 39 55.5012     13.66   13.43 ~ 3 0
138 [LML2012] 62594 BS* 17 41 04.7567899320 -53 46 12.873874836     16.33   15.74 ~ 1 0
139 [LML2012] 11063 HB* 17 41 05.0068721880 -53 29 37.032327240     13.49   13.20 ~ 2 0
140 NGC 6397 78 HB* 17 41 05.4723643440 -53 37 35.075236224     13.09   12.76 ~ 4 0
141 Cl* NGC 6397 ABCPO 599 BS* 17 41 05.4966659880 -53 38 24.435812976   15.78 15.47   15.12 ~ 3 0
142 [LML2012] 72734 HB* 17 41 06.0466427976 -53 40 09.470050644     13.43   13.19 ~ 2 0
143 [LML2012] 74430 HB* 17 41 08.7123717432 -53 39 22.606755192     13.02   12.64 ~ 2 0
144 NGC 6397 4 RG* 17 41 09.6622579176 -53 32 46.399833456   13.61 13.43   13.06 A0p 8 0
145 [LML2012] 60940 HB* 17 41 10.651 -53 47 39.63     13.14   12.88 ~ 1 0
146 NGC 6397 245 HB* 17 41 10.6899309000 -53 40 58.586148552     13.33   13.07 ~ 4 0
147 NGC 6397 210 HB* 17 41 13.2644023176 -53 39 31.151295720     13.58   13.36 ~ 6 0
148 NGC 6397 215 HB* 17 41 18.7520952768 -53 38 27.570830532     13.67   13.45 ~ 4 0
149 NGC 6397 1 HB* 17 41 25.9267938312 -53 32 42.746214048   14.58 13.48   13.24 ~ 5 0
150 [LML2012] 1655 HB* 17 41 34.1153531832 -53 30 00.998788284     13.14   12.80 ~ 2 0
151 [LML2012] 89014 HB* 17 41 38.1082431816 -53 42 30.804350832     13.15   12.87 ~ 2 0
152 [LML2012] 91315 HB* 17 41 38.9900614536 -53 38 44.736131796     13.52   13.29 ~ 2 0
153 [LML2012] 90302 HB* 17 41 58.2898770720 -53 40 25.710933072     13.43   13.18 ~ 3 0
154 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 847 1
155 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1379 0
156 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1069 0

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