2018A&A...615A.101D


Query : 2018A&A...615A.101D

2018A&A...615A.101D - Astronomy and Astrophysics, volume 615A, 101-101 (2018/7-1)

The VLT-FLAMES Tarantula Survey. XXVIII. Nitrogen abundances for apparently single dwarf and giant B-type stars with small projected rotational velocities.

DUFTON P.L., THOMPSON A., CROWTHER P.A., EVANS C.J., SCHNEIDER F.R.N., DE KOTER A., DE MINK S.E., GARLAND R., LANGER N., LENNON D.J., McEVOY C.M., RAMIREZ-AGUDELO O.H., SANA H., SIMON DIAZ S., TAYLOR W.D. and VINK J.S.

Abstract (from CDS):

Previous analyses of the spectra of OB-type stars in the Magellanic Clouds have identified targets with low projected rotational velocities and relatively high nitrogen abundances; the evolutionary status of these objects remains unclear. The VLT-FLAMES Tarantula Survey obtained spectroscopy for over 800 early-type stars in 30 Doradus of which 434 stars were classified as B-type. We have estimated atmospheric parameters and nitrogen abundances usingTLUSTY model atmospheres for 54 B-type targets that appear to be single, have projected rotational velocities, vesini≤80km/s and were not classified as supergiants. In addition, nitrogen abundances for 34 similar stars observed in a previous FLAMES survey of the Large Magellanic Cloud have been re-evaluated. For both samples, approximately 75-80% of the targets have nitrogen enhancements of less than 0.3dex, consistent with them having experienced only small amounts of mixing. However, stars with low projected rotational velocities, vesini≤40km/s and significant nitrogen enrichments are found in both our samples and simulations imply that these cannot all be rapidly rotating objects observed near pole-on. For example, adopting an enhancement threshold of 0.6dex, we observed five and four stars in our VFTS and previous FLAMES survey samples, yet stellar evolution models with rotation predict only 1.25±1.11 and 0.26±0.51 based on our sample sizes and random stellar viewing inclinations. The excess of such objects is estimated to be 20-30% of all stars with current rotational velocities of less than 40km/s. This would correspond to ∼2-4% of the total non-supergiant single B-type sample. Given the relatively large nitrogen enhancement adopted, these estimates constitute lower limits for stars that appear inconsistent with current grids of stellar evolutionary models. Including targets with smaller nitrogen enhancements of greater than 0.2 dex implies larger percentages of targets that are inconsistent with current evolutionary models, viz. ∼70% of the stars with rotational velocities less than 40km/s and ∼6-8% of the total single stellar population. We consider possible explanations of which the most promising would appear to be breaking due to magnetic fields or stellar mergers with subsequent magnetic braking.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: early-type - stars: rotation - stars: abundances - Magellanic Clouds - galaxies: star clusters: individual: Tarantula Nebula

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 112

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Number of rows : 112
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10205 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6285 1
3 [ELS2006] N11 093 * 04 55 29.9590344528 -66 30 37.660389228 14.180 14.783 14.930   15.062 B2.5III 7 0
4 [ELS2006] N11 072 * 04 55 51.6261590472 -66 21 57.848920668 13.563 14.435 14.565   14.841 B0.2V 12 0
5 [L72] LH 9-80 * 04 56 20.7724086528 -66 27 03.429374976   14.37 14.56     B1III 9 0
6 [ELS2006] N11 106 * 04 56 42.0804495648 -66 31 19.184196216 13.953 14.803 14.878   15.103 B0V 9 0
7 [L72] LH 9-41 * 04 56 43.7015625504 -66 28 36.745839912 13.916 14.562 14.840   14.962 B1V 10 0
8 PGMW 3128 * 04 56 47.2162457064 -66 24 42.120879876   14.59 14.71     B0.2V 10 0
9 LHA 120-N 11 HII 04 56 51.4 -66 24 24           ~ 244 0
10 PGMW 3239 * 04 57 04.6124533752 -66 24 22.515518916 14.076 14.523 14.696   14.727 B3III 9 0
11 PGMW 3270 * 04 57 21.2090991936 -66 25 01.384362876   14.783 15.011   15.075 B0.5V 12 0
12 [ELS2006] N11 110 * 04 57 37.1078489736 -66 23 44.956664448 14.396 15.057 15.187   15.054 B1III 10 0
13 [ELS2006] N11 115 * 04 57 43.25 -66 24 38.0   15.01 15.15     B1III 7 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16002 1
15 Cl* NGC 2004 MHF 75553 * 05 29 15.9602772072 -67 19 45.715957608 14.110 14.792 14.876   15.132 B2III 8 0
16 Cl* NGC 2004 ELS 36 * 05 29 20.7373735536 -67 17 54.638031624   14.21 14.43     B1.5III 7 0
17 Cl* NGC 2004 ELS 91 * 05 29 34.3289289768 -67 15 01.947199752 14.379 15.071 15.200   15.565 B1.5III 7 0
18 Cl* NGC 2004 ELS 103 * 05 30 20.6574277512 -67 13 40.646730792   15.18 15.30     B2III 6 0
19 Cl* NGC 2004 ELS 76 * 05 30 20.6734689768 -67 08 41.016034356 14.483 15.057 15.203   15.458 B2.5III 6 0
20 Cl* NGC 2004 ELS 68 * 05 30 23.0180185032 -67 08 53.383809444 14.441 14.949 14.998     B2.5III 6 0
21 Cl* NGC 2004 ELS 116 * 05 30 23.5977827232 -67 10 41.576460600 14.757 15.431 15.564   15.866 B2III 6 0
22 Cl* NGC 2004 ELS 117 * 05 30 29.1381369840 -67 09 51.083372124   15.33 15.47     B2III 6 0
23 Cl* NGC 2004 SAAO 187 * 05 30 29.5136055624 -67 16 45.864988284 14.679 15.339 15.502   15.707 B2III 7 0
24 Cl* NGC 2004 ELS 43 * 05 30 38.7499074456 -67 15 13.141391328 13.829 14.555 14.725   14.862 B1.5III 6 0
25 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 268 0
26 Cl* NGC 2004 ELS 46 * 05 30 42.970 -67 16 43.35 13.848 14.604 14.780   14.949 B1.5III 7 0
27 Cl* NGC 2004 ELS 53 * 05 30 43.7985078912 -67 15 22.542451740 13.837 14.797 14.906   15.117 B0.2Ve 8 0
28 Cl* NGC 2004 ELS 114 * 05 30 47.9007016344 -67 24 45.679072032   15.25 15.43     B2III 6 0
29 Cl* NGC 2004 ROB C16 * 05 30 53.4457774920 -67 17 10.472475804 14.003 14.713 14.880   15.012 B2III 9 0
30 Cl* NGC 2004 ELS 73 * 05 30 55.7351543040 -67 18 48.462525756 14.362 15.036 15.185   15.413 B2III 6 0
31 Cl* NGC 2004 ELS 86 * 05 30 58.0278624072 -67 14 04.741936008 14.426 15.098 15.248   15.496 B2III 6 0
32 Cl* NGC 2004 ELS 87 * 05 31 01.3078381608 -67 20 09.072357504 14.396 15.057 15.171   15.411 B1.5V 6 0
33 Cl* NGC 2004 ELS 70 * 05 31 03.6243802104 -67 16 07.665248676 14.137 14.890 15.069   15.371 B0.7-B1III 7 0
34 Cl* NGC 2004 ELS 84 * 05 31 08.0353790736 -67 20 00.802884804 14.253 15.046 15.206   15.460 B1.5III 7 0
35 Cl* NGC 2004 ELS 42 * 05 31 12.0114992976 -67 23 14.728784712 13.838 14.463 14.597   14.819 B2.5III 7 0
36 Cl* NGC 2004 ELS 119 * 05 31 14.6584337496 -67 11 59.713415484 14.837 15.462 15.632   15.874 B2III 7 0
37 Cl* NGC 2004 ELS 64 * 05 31 19.1105375208 -67 16 54.605386344 14.048 14.865 15.050   15.365 B0.7-B1III 7 0
38 Cl* NGC 2004 ELS 112 * 05 32 04.7256052656 -67 19 03.476635536 14.629 15.298 15.426   15.651 B2III 6 0
39 Cl* NGC 2004 ELS 111 * 05 32 05.7397569144 -67 15 58.011894072 14.632 15.295 15.434   15.671 B2.5III 6 0
40 VFTS 10 * 05 37 04.7155944408 -69 08 56.699266524   16.83 16.79     B2V 7 0
41 VFTS 24 * 05 37 16.6757586120 -69 08 50.336175552   16.39 16.02     B0.2III-II 6 0
42 VFTS 29 * 05 37 18.2880461760 -69 03 04.579956720   16.71 16.73     B1V 7 0
43 VFTS 44 * 05 37 26.060 -69 07 29.29   16.55 16.62     B2V 6 0
44 VFTS 50 * 05 37 27.430 -69 10 40.15   16.95 16.77     B0V 6 0
45 VFTS 52 * 05 37 28.8624420120 -69 07 06.453404472   14.48 14.55     B0.2III-II 7 0
46 VFTS 53 * 05 37 28.9080279024 -69 06 52.799448276   15.37 15.28     B1III 7 0
47 VFTS 75 * 05 37 34.6787081592 -69 07 13.286817372   16.96 16.93     B1V 7 0
48 VFTS 95 * 05 37 38.5130215104 -69 06 04.424553252   16.04 16.06     B0.2V 8 0
49 VFTS 111 * 05 37 40.8636093408 -69 00 04.139322264   14.32 14.40     B2III 7 0
50 VFTS 119 * 05 37 41.7168067752 -69 07 28.140003156   16.43 16.36     B0.7V 8 0
51 VFTS 121 * 05 37 42.2249912952 -69 07 14.317645296   16.02 15.96     B1IV 7 0
52 [ST92] 1-46 * 05 37 42.59 -69 09 18.9 16.253 16.778 16.634   16.375 B2.5III 8 0
53 VFTS 126 * 05 37 42.9468480888 -69 01 05.269337796   16.71 16.78     B1V 7 0
54 VFTS 152 * 05 37 46.6907186304 -69 06 19.531745532   15.57 15.32     B2IIIe 8 0
55 VFTS 167 * 05 37 48.810 -69 09 15.88   16.08 16.07     B1V 7 0
56 VFTS 170 * 05 37 49.9931174880 -69 07 42.084863184   16.18 16.03     B1IV 7 0
57 NGC 2060 SNR 05 37 51.4466169456 -69 10 23.947092084   9.69 9.59     ~ 336 2
58 VFTS 183 * 05 37 51.4956464784 -69 11 25.475373096   16.89 16.51     B0IV 8 0
59 2MASS J05375509-6908549 * 05 37 55.10 -69 08 55.0   16.29 16.4     B2V 9 0
60 VFTS 209 * 05 37 56.5913287992 -69 03 48.568296708   16.27 16.33     B1V 7 0
61 VFTS 214 * 05 37 58.0064935488 -69 13 09.484140720   16.11 15.84     B0IV-III 8 0
62 VFTS 237 * 05 38 06.630 -69 14 06.96   15.99 15.93     B1-1.5V-IVe 7 0
63 VFTS 241 * 05 38 07.0837970928 -69 04 14.659385844   16.62 16.65     B0IV 8 0
64 VFTS 242 * 05 38 07.8308612520 -69 00 57.006463392   16.86 16.82     B0IV 8 0
65 VFTS 273 * 05 38 15.6098074512 -69 12 12.077937432   16.77 16.74     B2.5V 7 0
66 H88 301 Cl* 05 38 16 -69 04.0   11.18 10.89     ~ 68 0
67 IRSF J05381724-6909110 * 05 38 17.195 -69 09 11.82   16.82 16.84     B1V 7 0
68 IRSF J05381841-6903517 * 05 38 18.370 -69 03 52.03   16.68 16.64     B1.5V 7 0
69 VFTS 308 * 05 38 19.4123355672 -69 04 03.086366376   15.87 15.88     B2V 7 0
70 VFTS 313 * 05 38 20.3765630928 -69 06 22.759874712   16.39 16.32     B0IV 9 0
71 VFTS 331 * 05 38 23.2791994800 -69 12 54.018144396   16.65 16.71     B1.5V 7 0
72 VFTS 347 * 05 38 27.8044188000 -69 05 27.231624204   16.69 16.68     B0V 8 0
73 VFTS 353 * 05 38 28.5414144168 -69 07 51.192863904   16.73 16.60     B2V-III 7 0
74 Cl* NGC 2070 MEL 60 * 05 38 29.9917123464 -69 05 05.218516212   14.81 14.88     B0.2III-II 12 0
75 [P93] 287 * 05 38 32.3255277144 -69 07 35.924055924   17.21 16.72     B0V-III 8 0
76 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1099 2
77 VFTS 469 * 05 38 39.4166227056 -69 03 07.722409968   16.09 16.09     B0V 7 0
78 [P93] 738 * 05 38 39.8245035816 -69 07 10.950647916   17.04 16.72     B0.7V-III 8 0
79 VFTS 504 * 05 38 41.390 -69 03 00.89   16.88 16.27     B0.7V 9 0
80 NGC 2070 Cl* 05 38 42 -69 06.0     7.25     ~ 348 1
81 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1857 1
82 Cl* NGC 2070 SMB 372 * 05 38 43.080 -69 06 36.88   16.78 16.55   16.42 B0V 10 0
83 Cl* NGC 2070 SMB 450 * 05 38 43.730 -69 06 27.18   17.06 17.00   16.87 B1V 7 0
84 2MASS J05384477-6908569 * 05 38 44.7277264104 -69 08 57.158809368   16.53 16.38     B1V 8 0
85 VFTS 593 * 05 38 45.7083868032 -69 09 40.159551420   16.93 16.84     B2.5V 7 0
86 [P93] 1389 * 05 38 47.4637391208 -69 07 13.482208848   16.57 16.48     B0.5:V 10 0
87 2MASS J05384814-6907415 * 05 38 48.1367289456 -69 07 41.600938944 15.250 15.874 15.516   15.772 B0.2V 12 0
88 VFTS 625 * 05 38 48.1746764520 -69 08 34.152222876   17.02 16.91     B1.5V 7 0
89 VFTS 650 * 05 38 50.690 -68 57 55.47   16.88 16.98     B1.5V 7 0
90 VFTS 666 * 05 38 52.7984152944 -69 01 38.138423592   16.34 16.42     B0.5V 7 0
91 VFTS 668 * 05 38 52.8629713752 -69 07 36.086327976   16.7 16.60     B0.7V 7 0
92 VFTS 673 * 05 38 54.1275058224 -69 06 53.059653396   17.01 16.98     B1V 7 0
93 [P93] 1786 * 05 38 56.859 -69 06 38.47   16.22 16.17     B0.2V 9 0
94 OGLE LMC-ECL-21573 EB* 05 38 58.9082571720 -69 06 42.177142584   15.66 15.59   15.459 B0.5V 13 0
95 VFTS 712 * 05 38 59.4572140512 -69 05 49.593525036   16.34 16.13     B1V 8 0
96 VFTS 725 * 05 39 03.2214054552 -69 08 18.353598288   15.95 15.84     B0.7III 12 0
97 VFTS 727 * 05 39 03.3253029528 -69 10 39.724563504   16.92 16.74     B3III 6 0
98 VFTS 740 * 05 39 06.0206068920 -69 15 41.638501620   16.85 16.50     B0.7III 7 0
99 VFTS 748 * 05 39 07.9498916184 -69 06 02.696372748   16.94 16.78     B0.7V 7 0
100 VFTS 772 * 05 39 17.8125147720 -68 57 33.772447908   16.88 16.89     B3-5V-III 6 0
101 VFTS 801 * 05 39 31.6551330792 -68 59 47.469536268   15.87 15.94     B1.5V 7 0
102 [SL63] 639 As* 05 39 39 -69 12.1   12.13 11.53     ~ 24 0
103 VFTS 835 * 05 39 40.840 -69 11 52.41           B1Ve 7 0
104 IRSF J05395154-6902226 * 05 39 51.533 -69 02 22.66   15.74 15.83     B2III 7 0
105 VFTS 860 * 05 39 55.1230235712 -69 11 22.128880344   16.8 16.67     B1.5V 7 0
106 VFTS 864 * 05 39 56.8158773688 -69 01 23.082294036   16.59 16.64     B1.5V 7 0
107 VFTS 868 * 05 40 04.2951140640 -69 11 02.946628572   16.92 16.65     B2V 6 0
108 VFTS 872 * 05 40 07.6250748720 -69 03 23.973697152   16.02 16.09     B0V-IV 7 0
109 VFTS 879 * 05 40 13.6910236896 -69 05 09.761910936   16.84 16.73     B3V-III 6 0
110 VFTS 881 * 05 40 17.2449275952 -69 06 27.073400508   15.6 15.66     B0.5III 7 0
111 IRSF J05402029-6903119 * 05 40 20.279 -69 03 12.01   15.91 15.90     B1.5V 7 0
112 VFTS 886 * 05 40 21.1904027592 -69 03 29.586666708   16.78 16.82     B1V 6 0

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2022.05.27-00:05:08

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