2018A&A...616A.112S


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST19:54:04

2018A&A...616A.112S - Astronomy and Astrophysics, volume 616A, 112-112 (2018/8-1)

Deep secrets of intermediate-mass giants and supergiants. Models with rotation seem to overestimate mixing effects on the surface abundances of C, N, and Na.

SMILJANIC R., DONATI P., BRAGAGLIA A., LEMASLE B. and ROMANO D.

Abstract (from CDS):


Context. Recent observational results have demonstrated an increase in the surface Na abundance that correlates with stellar mass for red giants between 2 and 3M. This trend supports evolutionary mixing processes as the explanation for Na overabundances seen in some red giants. In this same mass range, the surface Al abundance was shown to be constant.
Aims. Our main aim was to extend the investigation of the Na and Al surface abundances to giants more massive than 3M. We sought to establish accurately whether the Na abundances keep increasing with stellar mass or a plateau is reached. In addition, we investigated whether mixing can affect the surface abundance of Al in giants more massive than 3M.
Methods. We obtained new high-resolution spectra of 20 giants in the field of 10 open clusters; 17 of these stars were found to be members of 9 clusters. The giants have masses between 2.5M and 5.6M. A model atmosphere analysis was performed and abundances of up to 22 elements were derived using equivalent widths. Additionally, abundances of C, N, and O were determined using spectrum synthesis. The abundances of Na and Al were corrected for non-local thermodynamic equilibrium (non-LTE) effects. Moreover, to extend the mass range of our sample, we collected from the literature high-quality C, N, O, and Na abundances of 32 Galactic Cepheids with accurate masses in the range between 3M and 14M.
Results. The surface abundances of C, N, O, Na, and Al were compared to predictions of stellar evolution models with and without the inclusion of rotation-induced mixing. The surface abundances of most giants and Cepheids of the sample can be explained by models without rotation. For giants above I2.5M, the Na abundances reach a plateau level of about [Na/Fe]∼0.20-0.25dex (in non-LTE). This is true for both Cepheids and giants in open clusters. Regarding Al, the non-LTE [Al/Fe] ratios are mostly close to solar and suggest that Al is not affected by the first dredge-up up to ∼5.0M. Our results support previous works that found models with rotation to overestimate the mixing effects in intermediate-mass stars.

Abstract Copyright: © ESO 2018

Journal keyword(s): open clusters and associations: general - stars: abundances - stars: evolution - stars: late-type - stars: variables: Cepheids

VizieR on-line data: <Available at CDS (J/A+A/616/A112): stars.dat table5.dat table6.dat tablea1.dat>

CDS comments: Table 1, NGC 2099 1898 and NGC 2099 2520 are respectively Cl* NGC 2099 MMU 454 and Cl* NGC 2099 MMU 67 in SIMBAD.

Simbad objects: 79

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Number of rows : 79

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 627 ** 00 10 46.3658298024 +58 46 10.259789721   8.37 8.25     B7V 43 1
2 BD+58 204 * 01 15 57.8347454736 +58 47 57.428882389   12.32 11.22     K0 7 0
3 NGC 436 OpC 01 15 58 +58 48.7   8.01 8.8     ~ 64 0
4 Cl Stock 2 OpC 02 14 43 +59 29.1           ~ 101 0
5 HD 14173 * 02 19 41.5268033400 +60 00 46.995461393   8.16 7.19     G5II 28 0
6 HD 16068 * 02 36 52.7996071580 +55 54 55.441758278   9.18 7.45     K3II-III 27 0
7 Cl Trumpler 2 OpC 02 36 53 +55 54.9           ~ 91 0
8 V* V791 Cas EB* 02 36 55.2984361030 +59 53 00.984651625   8.03 7.78     B8V 21 1
9 V* SU Cas cC* 02 51 58.7508894403 +68 53 18.601570075 6.92 6.44 5.80     F5.5III+ 412 1
10 Cl Alessi 95 Cl* 02 52 15.1 +68 53 19           ~ 10 0
11 NGC 1342 OpC 03 31 38 +37 22.6   7.35 6.7     ~ 105 0
12 HD 275507 * 03 32 02.4666811572 +37 21 21.543781579   11.2 9.98     G0 12 0
13 HD 275501 * 03 32 11.2287127470 +37 22 55.443702404   10.57 9.26     K0 23 0
14 TYC 3340-990-1 * 04 14 33.5454711360 +51 28 05.547212026   11.27 9.69     ~ 2 0
15 BD+50 937 * 04 14 55.2066162213 +51 10 42.275459208   11.57 10.00     ~ 7 0
16 NGC 1528 5 * 04 15 19.7108074006 +51 14 23.259187740   11.22 10.05     ~ 5 0
17 NGC 1528 OpC 04 15 23 +51 12.9   6.83 6.4     ~ 101 0
18 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2758 0
19 NGC 1662 OpC 04 48 27 +10 56.2   7.0 6.4     ~ 110 0
20 TYC 687-481-1 * 04 48 27.8716360479 +10 55 45.728468578   10.87 10.26     ~ 7 0
21 HD 30485 * 04 48 29.5101635104 +10 55 48.268059163   9.52 8.34     G8III 25 0
22 HD 287148 * 04 48 32.0830735220 +10 57 59.017350805   10.03 8.87     G5 26 0
23 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15356 1
24 NGC 2099 454 * 05 52 12.5189650885 +32 38 42.819322214   12.40 11.16     ~ 8 0
25 NGC 2099 67 * 05 52 16.5414428088 +32 34 45.867703339   12.34 11.15     ~ 12 0
26 M 37 OpC 05 52 18 +32 33.2   6.19 5.6     ~ 339 2
27 V* T Mon cC* 06 25 12.9997562821 +07 05 08.561189768 8.24 7.20 5.98   4.996 G3Iabv+A0p 450 1
28 V* CV Mon cC* 06 37 04.8448658715 +03 03 50.276498200   11.32 9.90   8.631 ~ 217 0
29 BD+41 1511 * 06 48 15.0939491108 +41 04 22.222373881   9.82 8.86     G0 10 0
30 NGC 2281 OpC 06 48 17 +41 04.7   6.05 5.4     ~ 129 0
31 HD 49009 * 06 48 21.7239039959 +41 18 08.358803707   8.61 7.24     K2III 30 0
32 BD+41 1517 * 06 48 27.9728957850 +41 04 50.781041116   10.62 9.51     K0 6 0
33 V* AQ Pup cC* 07 58 22.0887170720 -29 07 48.335325928   9.70 8.54   7.175 F5-G2Ib 182 0
34 V* BN Pup cC* 08 06 21.4748690781 -30 05 48.768197196   10.99 9.75 8.97 8.981 G4 109 0
35 V* RS Pup cC* 08 13 04.2157137938 -34 34 42.691837063 8.89 8.00 6.70   5.453 F8Iab 325 0
36 V* RZ Vel cC* 08 37 01.3029337589 -44 06 52.844429407   8.507 7.260     G1Ib 203 0
37 V* T Vel cC* 08 37 40.8268486937 -47 21 43.082343785   8.92 7.68   6.970 G0II 154 0
38 V* SW Vel cC* 08 43 38.6904013543 -47 24 11.196771088   9.58 8.32     F8/G0Ib 171 0
39 * l Car cC* 09 45 14.8112246 -62 30 28.451894   4.33 3.40     G5Iab/b 296 1
40 V* RY Vel cC* 10 20 41.0317627466 -55 19 17.035924264   9.71 7.86   6.840 F5Ib/II 134 0
41 V* VY Car cC* 10 44 32.6908129391 -57 33 55.326019898 8.12 7.70 6.87   6.299 F7Iab/b 200 0
42 [KPR2005] 61 OpC 10 46.1 -56 52           ~ 15 0
43 V* WZ Car cC* 10 55 18.7272542108 -60 56 23.951208594   10.40 9.37     F8 135 0
44 V* U Car cC* 10 57 48.1866898409 -59 43 55.880151632 8.31 7.21 6.11   5.073 G5/8Iab 216 0
45 Cl Feinstein 1 OpC 11 06 43 -59 49.2   4.84 4.7     ~ 33 0
46 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4 12.27     O9III/Veq 1009 0
47 V* UU Mus cC* 11 52 17.7225421742 -65 24 15.060675590   10.5 9.54     F7/G0p 120 0
48 V* VW Cen cC* 13 33 59.0299132697 -64 03 19.999430004   11.60 10.36   8.785 ~ 108 0
49 V* KN Cen cC* 13 36 36.8945451169 -64 33 29.916343439   11.22 9.86     G8Iab+B6.0V 128 0
50 V* XX Cen cC* 13 40 18.6446943543 -57 36 47.444003198   8.72 7.30   6.747 F7/8II 174 0
51 V* V Cen cC* 14 32 33.0828020969 -56 53 15.774776152 8.44 7.84 6.93   5.798 F5Ib/II 247 0
52 NGC 5662 OpC 14 35 37 -56 37.1   6.18 5.5     ~ 102 0
53 V* U Nor cC* 15 42 20.9180199642 -55 18 42.941765163   10.68 9.22     F8Ib/II 128 0
54 NGC 6067 OpC 16 13 11 -54 13.1           ~ 177 0
55 V* V340 Nor cC* 16 13 17.3998357878 -54 14 05.588347830   9.61 8.47 8.83   G2Iab 138 0
56 NGC 6087 OpC 16 18 50 -57 56.1   5.85 5.4     ~ 158 0
57 V* S Nor cC* 16 18 51.8313333962 -57 53 59.253617873 8.15 7.49 6.49   5.427 F8/G0Ib 348 1
58 V* BF Oph cC* 17 06 05.4979763004 -26 34 50.031704299 8.00 7.61 6.93   6.377 G0II 206 0
59 V* RY Sco cC* 17 50 52.3454231474 -33 42 20.410667234 9.77 8.79 7.51   6.256 F6Ib 172 0
60 Cl Turner 2 OpC 18 16 51 -19 01.8           ~ 17 0
61 V* WZ Sgr cC* 18 16 59.7158915244 -19 04 32.989119557   9.10 7.45     F7(III) 233 0
62 IC 4725 OpC 18 31 47 -19 07.0           ~ 197 0
63 V* U Sgr cC* 18 31 53.3321808602 -19 07 30.262730218 8.50 7.81 6.68   5.413 G1Ib 439 0
64 NGC 6664 OpC 18 36 37 -07 48.8   8.81 7.8     ~ 106 0
65 V* EV Sct cC* 18 36 39.6017832876 -08 11 05.360422056   10.99 9.90     G0II 234 0
66 V* BB Sgr cC* 18 50 59.8730479535 -20 17 42.828317888 8.07 7.53 6.69   5.824 G0Ib 237 0
67 NGC 6705 OpC 18 51 05 -06 16.2   6.32 5.8     ~ 366 0
68 NGC 6709 OpC 18 51 18 +10 19.1   7.18 6.7     ~ 98 0
69 BD+10 3697 * 18 51 31.8013099867 +10 18 49.848902419   10.51 9.03     K2Ib 5 0
70 UCAC4 502-094200 * 18 51 35.4577529364 +10 19 05.138703004       11.29   ~ 2 0
71 Cl Collinder 394 OpC 18 52 16 -20 12.2     6.3     ~ 61 0
72 V* SV Vul cC* 19 51 30.9059608126 +27 27 36.835645654 8.65 7.86 6.74   5.703 F8Ia 404 0
73 * eta Aql cC* 19 52 28.3677478 +01 00 20.369619 5.12 4.61 3.80   3.030 F6Iab+B9.8V 642 0
74 C 2021+415 OpC 20 23.3 +41 42     10.1     ~ 16 0
75 HD 229204 * 20 23 19.9310504805 +41 41 46.236823085   11.61 10.12     ~ 4 0
76 TYC 3160-453-1 * 20 23 28.7337526496 +41 41 23.888443754   12.60 10.60     ~ 1 0
77 TYC 3160-463-1 * 20 23 36.1520266541 +41 44 01.271548364   11.98 10.61     ~ 3 0
78 V* X Cyg cC* 20 43 24.1918662954 +35 35 16.075732392 8.69 7.70 6.47   5.241 F7Ib 444 0
79 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 689 0

    Equat.    Gal    SGal    Ecl

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2021.05.16-19:54:04

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