2010A&A...517A..38P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST06:31:19

2010A&A...517A..38P - Astronomy and Astrophysics, volume 517, A38-38 (2010/7-1)

Mixing of CNO-cycled matter in massive stars.

PRZYBILLA N., FIRNSTEIN M., NIEVA M.F., MEYNET G. and MAEDER A.

Abstract (from CDS):

We test predictions of evolution models on mixing of CNO-cycled products in massive stars from a fundamental perspective. Relative changes within the theoretical C:N:O abundance ratios and the buildup of helium are compared with observational results. A sample of well-studied Galactic massive stars is presented. High-quality optical spectra are carefully analysed using improved NLTE line-formation and comprehensive analysis strategies. The results are put in the context of the existing literature data. A tight trend in the observed N/C vs. N/O ratios and the buildup of helium is found from the self-consistent analysis of main-sequence to supergiant stars for the first time. The catalytic nature of the CNO-cycles is confirmed quantitatively, though further investigations are required to derive a fully consistent picture. Our observational results support the case of strong mixing, as predicted e.g. by evolution models that consider magnetic fields or by models that have gone through the first dredge-up in the case of many supergiants.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: early-type - stars: evolution - stars: massive - supergiants

Simbad objects: 20

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Number of rows : 20

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 HD 13476 * 02 13 41.6106348614 +58 33 38.103912891 7.26 7.04 6.43 5.89 5.40 A2Iab 127 0
2 HD 14433 sg* 02 21 55.4352553767 +57 14 34.495206459 7.01 6.97 6.4800 5.79 6.7332 A1Ia 143 0
3 * bet Ori s*b 05 14 32.27210 -08 12 05.8981 -0.56 0.10 0.13 0.13 0.15 B8Iae 726 0
4 HD 36591 V* 05 32 41.3503640106 -01 35 30.577451332 4.240 5.150 5.340     B2II/III 227 1
5 V* PT Pup bC* 07 36 41.0358985359 -19 42 08.425242012 4.65 5.524 5.699     B2II 134 0
6 * P Pup ** 07 49 14.2953578 -46 22 23.542204 2.92 3.93 4.11 4.19 4.36 B0III 141 0
7 * alf Pyx V* 08 43 35.5375544 -33 11 10.989788 2.65 3.50 3.68 3.76 3.93 B1.5III 197 0
8 * eta Leo * 10 07 19.9518606 +16 45 45.580270 3.17 3.39 3.41 3.32 3.35 A0Ib 318 0
9 HD 92207 sg* 10 37 27.0681943657 -58 44 00.015326487 5.71 5.95 5.45     A0Ia 145 0
10 HD 111613 sg* 12 51 17.9762278922 -60 19 47.233954725 6.00 6.10 5.72 5.32 5.03 B9.5Iab 106 0
11 * chi Cen bC* 14 06 02.7682446 -41 10 46.678780 3.4 4.155 4.343     B2V 203 1
12 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 854 0
13 HD 187982 V* 19 52 01.5937220881 +24 59 31.772613798 6.41 6.28 5.57     A2Ia 104 0
14 * 42 Cyg pA* 20 29 20.3899981108 +36 27 17.011345364   6.291 5.899     A2Iab-Ib 78 0
15 * alf Cyg sg* 20 41 25.91514 +45 16 49.2197 1.11 1.34 1.25 1.14 1.04 A2Ia 716 0
16 * sig Cyg sg* 21 17 24.9524404 +39 23 40.852798 3.98 4.37 4.24 4.06 3.92 A0Ia 250 0
17 HD 207673 * 21 49 40.0940878996 +41 08 55.627207171 6.97 6.90 6.48     A2Ib 72 0
18 HD 210221 Pu* 22 07 25.5853748300 +53 18 26.771994597 6.81 6.555 6.171     A3Ib 73 0
19 * 4 Lac * 22 24 30.9907943432 +49 28 34.999228897 4.33 4.67 4.58 4.45 4.35 A0Ib 171 0
20 HD 213470 Em* 22 30 18.7033394914 +57 13 31.593381288 7.45 7.183 6.679     A3Ia 75 0

    Equat.    Gal    SGal    Ecl

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2020.07.09-06:31:19

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