2006A&A...449..655S


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.12CET03:09:26

2006A&A...449..655S - Astronomy and Astrophysics, volume 449, 655-671 (2006/4-2)

CNO in evolved intermediate mass stars.

SMILJANIC R., BARBUY B., DE MEDEIROS J.R. and MAEDER A.

Abstract (from CDS):

In order to investigate the possible influence of rotation on the efficiency of the first dredge-up we determined atmospheric parameters, masses, and abundances of carbon, nitrogen, and oxygen in a sample of evolved intermediate mass stars. We used high resolution spectra and conducted a model atmosphere analysis. The abundances were calculated through spectral synthesis and compared to the predictions of rotating and non-rotating evolutionary models. Almost all those objects in our sample where carbon and nitrogen abundances could be determined show signs of internal mixing. The stars, however, seem to be mixed to different extents. Among the mixed stars we identify five in our sample with abundances in agreement with the non-rotating models, four stars that seem to be mixed beyond that, and one star that seems to be slightly less mixed than predicted for the first dredge-up. There are also five stars that seem to be slightly more mixed than expected, but their abundances are in marginal agreement with both rotating and non-rotating models. Such differences in the extent of the mixing are not predicted by the standard models and imply the action of other mixing mechanisms than solely the convective dredge-up. We also identified for the first time an important correlation between the [N/C] ratio and the stellar mass.

Abstract Copyright:

Journal keyword(s): stars: fundamental parameters - stars: abundances - stars: supergiants - stars: rotation

Simbad objects: 22

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Number of rows : 22

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 * 3 Cet V* 00 04 30.1182732 -10 30 34.284891   6.541 4.924     K3Ib 103 0
2 HD 1219 * 00 16 23.6889462700 -51 36 41.128916636   10.213 9.665     K1IV 6 0
3 HD 6130 ** 01 03 37.00525 +61 04 29.3612   6.55 6.01 7.04   F0II 58 0
4 HD 25291 * 04 04 27.1618107506 +59 09 19.836700923 6.10 5.63 5.12 4.62 4.24 F0II 100 0
5 * alf Lep V* 05 32 43.8161188 -17 49 20.241380 3.02 2.77 2.57 2.35 2.14 F0Ib 266 0
6 HD 38713 * 05 47 07.8044685615 -16 14 17.089285006   7.058 6.157     G8III 26 0
7 HD 44362 * 06 18 46.7865658434 -50 21 32.762522408   7.866 7.031     G1.5Ib 28 0
8 * alf Car * 06 23 57.10988 -52 41 44.3810 -0.49 -0.59 -0.74 -0.96 -1.13 A9II 413 0
9 HD 49396 * 06 45 26.0553710861 -52 12 03.324659393   7.622 6.544     G5Iab 23 0
10 HD 49068 * 06 45 43.0119343043 -20 51 09.598832474   8.71 7.43     K1.5III 68 0
11 HD 51043 * 06 52 47.0221089698 -54 05 25.207010262   7.641 6.545     G5Ib/II 18 0
12 HD 58585 * 07 25 19.9744198699 -21 58 57.320044847   6.251 6.038     A5/7II 25 1
13 HD 66190 * 08 00 19.5323605410 -45 27 25.025508686   7.867 6.599     K1Ib/II 13 0
14 HD 71181 * 08 24 07.4650593691 -45 14 09.569694890   8.76 7.62     G6Ib/II 7 0
15 HD 76860 * 08 56 58.5448484822 -49 40 51.679503331   8.90 7.14     K3Ib 9 0
16 * iot Car V* 09 17 05.4068572 -59 16 30.835305 2.60 2.44 2.26 2.02 1.82 A7Ib 146 0
17 HD 90289 V* 10 23 50.6306803504 -57 57 14.151769672   7.834 6.325     K4III 17 0
18 HD 102839 * 11 49 56.6145709308 -70 13 32.831577564   6.333 4.964     G6Ib 34 0
19 HD 114792 * 13 14 01.9100844029 -62 39 13.999964406 8.29 7.72 6.84 7.54   F5/6Ib 29 0
20 HD 159633 * 17 37 26.9187964146 -38 03 58.910865846   7.52 6.27     G2Ib 23 0
21 * alf01 Cap ** 20 17 38.8690959065 -12 30 29.571594020 6.14 5.34 4.27 3.49 2.94 G3Ib 129 0
22 * bet Aqr * 21 31 33.5317148 -05 34 16.232006 4.27 3.71 2.89 2.29 1.84 G0Ib 425 0

    Equat.    Gal    SGal    Ecl

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2019.11.12-03:09:27

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