2017A&A...604A.123C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:28:53

2017A&A...604A.123C - Astronomy and Astrophysics, volume 604A, 123-123 (2017/8-1)

Chemical abundances of fast-rotating massive stars. II. Interpretation and comparison with evolutionary models.

CAZORLA C., NAZE Y., MOREL T., GEORGY C., GODART M. and LANGER N.

Abstract (from CDS):

Aims. Past observations of fast-rotating massive stars exhibiting normal nitrogen abundances at their surface have raised questions about the rotational mixing paradigm. We revisit this question thanks to a spectroscopic analysis of a sample of bright fast-rotating OB stars, with the goal of quantifying the efficiency of rotational mixing at high rotation rates.
Methods. Our sample consists of 40 fast rotators on the main sequence, with spectral types comprised between B0.5 and O4. We compare the abundances of some key element indicators of mixing (He, CNO) with the predictions of evolutionary models for single objects and for stars in interacting binary systems.
Results. The properties of half of the sample stars can be reproduced by single evolutionary models, even in the case of probable or confirmed binaries that can therefore be true single stars in a pre-interaction configuration. The main problem for the rest of the sample is a mismatch for the [N/O] abundance ratio (we confirm the existence of fast rotators with a lack of nitrogen enrichment) and/or a high helium abundance that cannot be accounted for by models. Modifying the diffusion coefficient implemented in single-star models does not solve the problem as it cannot simultaneously reproduce the helium abundances and [N/O] abundance ratios of our targets. Since part of them actually are binaries, we also compared their chemical properties with predictions for post-mass transfer systems. We found that these models can explain the abundances measured for a majority of our targets, including some of the most helium-enriched, but fail to reproduce them in other cases. Our study thus reveals that some physical ingredients are still missing in current models.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: abundances - stars: early-type - stars: fundamental parameters - stars: massive - stars: rotation - stars: rotation

Simbad objects: 51

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Number of rows : 51

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
2 HD 13268 * 02 11 29.7002216680 +56 09 31.717631935 7.48 8.24 8.18     ON8.5IIIn 161 0
3 HD 14434 Em* 02 21 52.4122106464 +56 54 18.032877629 7.87 8.65 8.49 8.29 8.20 O5.5Vnn((f))p 169 0
4 HD 14442 V* 02 22 10.7000311184 +59 32 58.894123083 9.01 9.58 9.27     O5n(f)p 97 0
5 HD 15137 SB* 02 27 59.8115835376 +52 32 57.594553098 7 7.92 7.86     O9.5II-IIIn 113 0
6 HD 15642 * 02 32 56.3834041116 +55 19 39.056615952 9.305 8.56 8.55     O9.5II-IIIn 90 0
7 BD+60 594 * 02 57 04.1272029480 +61 24 57.668385897 10.563 9.58 9.30     O9V 85 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
9 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 901 0
10 * 1 Cam A * 04 32 01.8403464388 +53 54 39.016782733   5.87 5.77 6.71   O9.7IIn 6 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
12 BD+34 1058 * 05 28 39.4051594939 +34 40 08.728124803 8.31 8.99 8.84     O8nn 39 0
13 HD 41161 * 06 05 52.4560396927 +48 14 57.426040975 5.66 6.658 6.764     O8Vn 119 0
14 HD 41997 * 06 08 55.8225631699 +15 42 18.192142635 8.16 9.47 9.13 8.83   O7.5Vn((f)) 85 0
15 HD 46056 Em* 06 31 20.8609777928 +04 50 03.842065994 7.60 8.36 8.16 8.16 8.09 O8Vn 202 0
16 NGC 2244 OpC 06 31 55 +04 56.5   5.26 4.8     ~ 563 4
17 HD 46485 * 06 33 50.9569280058 +04 31 31.615740046 7.92 8.60 8.27   8.10 O7V((f))nzvar? 125 0
18 HD 47129 SB* 06 37 24.0417003671 +06 08 07.376246443 5.23 6.11 6.06     O8I+O7.5III 368 0
19 ALS 18675 * 06 38 14.7 +00 44 17 13.73 14.18 13.6     ~ 6 0
20 HD 52266 SB* 07 00 21.0761535622 -05 49 35.948161271 6.32 7.22 7.23     O9.5IIIn 106 0
21 HD 52533 EB* 07 01 27.0485530401 -03 07 03.281136257 6.66 7.57 7.68     O8.5IVn 103 0
22 V* V569 Mon bC* 07 05 49.63971 -10 39 36.2907 5.55 6.44 6.49 7.55   B1II/III 103 0
23 CD-27 4734 * 07 55 33.9879226974 -27 56 56.745845485 10.08 10.76 10.63 10.68   B0V 18 0
24 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1091 1
25 HD 69106 * 08 14 03.7993590115 -36 57 07.936730901 6.12 7.020 7.128 8.02   O9.7IIn 110 0
26 HD 74920 * 08 45 10.3407397959 -46 02 19.237276569 6.64 9.46 9.09 8.58   O7.5IVn((f)) 60 0
27 HD 84567 * 09 45 22.0069455345 -30 12 09.895878176 5.38 6.32 6.45     B0IV 61 0
28 HD 90087 * 10 22 20.8755454432 -59 45 19.691963587 6.91 9.49 8.92 8.96   O9.2III(n) 83 1
29 HD 92554 * 10 39 45.6467797062 -60 54 39.581104934 8.77 10.24 10.15 9.82   O9/B0 67 0
30 * tet Car SB* 10 42 57.4019674 -64 23 40.020796 1.53 2.54 2.76 2.87 3.10 B0Vp 313 0
31 IC 2602 OpC 10 42 58 -64 24.0           ~ 549 0
32 HD 93521 * 10 48 23.5116139485 +37 34 13.089937784 5.67 6.79 7.03     O9.5IIInn 402 1
33 HD 102415 * 11 46 54.4038347193 -61 27 46.985374046 8.51 9.44 9.35 9.67   ON9IIInn 35 0
34 V* V889 Cen El* 13 26 59.8291185701 -62 01 49.330309452 12.71 12.81 11.66 11.27   O4f+_+_O6/7:(f:) 21 0
35 HD 117490 * 13 32 08.5984445366 -60 48 55.483502747 8.13 8.94 8.92 9.52   ON9.5IIInn 31 0
36 HD 124979 * 14 18 11.9393634596 -51 30 13.855846589 7.81 8.61 8.51 9.37   O7.5IV(n)((f)) 77 1
37 HD 149404 s*b 16 36 22.5628576926 -42 51 31.909559692 5.23 5.88 5.52 6.90   O8.5Iab(f)p 224 1
38 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1723 2
39 HD 150574 * 16 44 07.2106897294 -46 08 29.843997832 8.01 8.74 8.50 9.30   ON9III(n) 56 0
40 HD 163892 * 17 59 26.3103513485 -22 28 00.866179563 6.81 7.61 7.44 8.55   O9.5IV(n) 92 0
41 HD 172367 * 18 40 09.7129677433 -07 15 01.976764451 9.45 9.88 9.54     B1Ib/II 28 0
42 HD 175876 * 18 58 10.7660968929 -20 25 25.544115183 5.79 6.82 6.94 6.93   O6.5III(n)(f) 142 0
43 * kap Aql * 19 36 53.4495162 -07 01 38.917563 4.050 4.930 4.960 4.90 4.94 B0.5IIIn 323 0
44 HD 188439 Pu* 19 53 01.2461804443 +47 48 27.790937434 5.24 6.147 6.279     B0.5IIIn 94 1
45 HD 191423 * 20 08 07.1135734619 +42 36 21.963024228 7.43 8.19 8.03     ON9II-IIInn 102 0
46 V* V2011 Cyg SB* 20 12 33.1205906584 +40 16 05.442931142 7.32 7.85 7.55     O4.5V(n)((f)) 195 0
47 HD 228841 Em* 20 18 29.6947589641 +38 52 39.772785669 9.08 9.50 9.01     O6.5Vn((f)) 55 0
48 HD 198781 * 20 49 17.3908439894 +64 02 32.125046483 5.75 6.472 6.451     B0.5V 91 0
49 * 68 Cyg SB* 21 18 27.1855667264 +43 56 45.388423736 4.05 4.99 5.00     O7.5IIIn((f)) 359 0
50 BD+53 2790 HXB 22 07 56.2368407539 +54 31 06.405811141 9.4 10.11 9.84 9.64 9.43 O9.5Vep 173 0
51 * lam Cep s*b 22 11 30.5750839949 +59 24 52.147736074 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 646 1

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2020.07.04-14:28:53

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