2019A&A...626A.121O


Query : 2019A&A...626A.121O

2019A&A...626A.121O - Astronomy and Astrophysics, volume 626A, 121-121 (2019/6-1)

γ Doradus stars as a test of angular momentum transport models.

OUAZZANI R.-M., MARQUES J.P., GOUPIL M.-J., CHRISTOPHE S., ANTOCI V., SALMON S.J.A.J. and BALLOT J.

Abstract (from CDS):

Helioseismology and asteroseismology of red giant stars have shown that distribution of angular momentum in stellar interiors, and the evolution of this distribution with time remains an open issue in stellar physics. Owing to the unprecedented quality and long baseline of Kepler photometry, we are able to seismically infer internal rotation rates in γ Doradus stars, which provide the main-sequence counterpart to the red-giants puzzle. Here, we confront these internal rotation rates to stellar evolution models which account for rotationally induced transport of angular momentum, in order to test angular momentum transport mechanisms. On the one hand, we used a stellar model-independent method developed by our team in order to obtain accurate, seismically inferred, buoyancy radii and near-core rotation for 37 γ Doradus stars observed by Kepler. We show that the stellar buoyancy radius can be used as a reliable evolution indicator for field stars on the main sequence. On the other hand, we computed rotating evolutionary models of intermediate-mass stars including internal transport of angular momentum in radiative zones, following the formalism developed in the series of papers started by Zahn (1992A&A...265..115Z), with theCESTAM code. This code calculates the rotational history of stars from the birth line to the tip of the RGB. The initial angular momentum content has to be set initially, which is done here by fitting rotation periods in young stellar clusters. We show a clear disagreement between the near-core rotation rates measured in the sample and the rotation rates obtained from the evolutionary models including rotationally induced transport of angular momentum following Zahn's prescriptions. These results show a disagreement similar to that of the Sun and red giant stars in the considered mass range. This suggests the existence of missing mechanisms responsible for the braking of the core before and along the main sequence. The efficiency of the missing mechanisms is investigated. The transport of angular momentum as formalized by Zahn and Maeder cannot explain the measurements of near-core rotation in main-sequence intermediate-mass stars we have at hand.

Abstract Copyright: © R.-M. Ouazzani et al. 2019

Journal keyword(s): stars: evolution - stars: low-mass - stars: oscillations - stars: rotation - stars: statistics - asteroseismology

VizieR on-line data: <Available at CDS (J/A+A/626/A121): obs.dat list.dat files/*>

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 869 OpC 02 18 58 +57 08.0           ~ 458 0
2 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1716 0
3 NGC 2362 OpC 07 18 41 -24 57.2           ~ 388 0
4 TYC 3540-1251-1 Er* 18 45 59.4908800752 +46 30 43.220586924   11.32 10.95     Am 16 0
5 2MASS J18465745+4316153 gD* 18 46 57.4608655344 +43 16 15.261625956           ~ 16 0
6 TYC 3130-1355-1 gD* 18 49 11.9650486872 +43 47 53.499344244   12.19 11.91     F1V 15 0
7 2MASS J19073544+4215120 dS* 19 07 35.4438561216 +42 15 12.019864464           F1V 11 0
8 TYC 3128-1500-1 Er* 19 08 39.9879531936 +42 27 11.752221924   11.33 10.91     ~ 12 0
9 TYC 3129-3189-1 Er* 19 10 05.7191 +42 09 54.588   12.03 11.72     ~ 13 0
10 TYC 3550-369-1 gD* 19 11 29.4137959896 +50 14 29.689592532   11.82 11.72     F1V 19 0
11 TYC 3125-2566-1 Pu* 19 12 23.3843371344 +40 42 14.006113488   10.73 10.42     ~ 11 0
12 BD+42 3281 Pu* 19 13 42.0647011272 +42 31 13.040195484   11.13 10.82     F1V 15 0
13 TYC 3129-2465-1 Pu* 19 13 57.9409700304 +43 04 57.941776668   12.59 12.18     F5Vaw 14 0
14 2MASS J19162335+3922208 dS* 19 16 23.3575784976 +39 22 20.784372528           F1V 10 0
15 2MASS J19185013+4837138 gD* 19 18 50.1442224456 +48 37 13.888752924           F0V 16 0
16 TYC 3551-405-1 gD* 19 22 45.4021467288 +49 04 48.010155528   12.26 11.67     F1V 17 0
17 TYC 3134-1158-1 Er* 19 23 33.3144 +37 59 00.555   11.91 11.74     ~ 15 0
18 TYC 3138-167-1 Pu* 19 24 11.0703856512 +41 00 41.571716832   12.24 11.73     F1V 16 0
19 2MASS J19251682+4423467 gD* 19 25 16.8181718232 +44 23 46.715917920           F1V 15 0
20 2MASS J19301049+4920280 gD* 19 30 10.5082520640 +49 20 28.074825204           F2IV 14 0
21 BD+42 3365 gD* 19 30 35.2323316632 +42 58 10.667202312   9.41 9.15     F0IV 16 0
22 BD+38 3623 Er* 19 30 35.7783151344 +38 35 16.641418560   10.28 9.91     F1V 18 0
23 TYC 3139-428-1 gD* 19 31 03.4961644056 +40 56 13.936587792   12.25 11.85     F1V 17 0
24 2MASS J19325124+4228465 Er* 19 32 51.2385295320 +42 28 46.505971020           F0IV 17 0
25 TYC 3564-346-1 Er* 19 34 22.5640094208 +50 15 46.286368848   11.62 11.14     F1V 13 0
26 TYC 3564-16-1 Er* 19 37 03.2104066656 +50 30 20.417184432   10.64 10.23     ~ 19 0
27 TYC 3139-1321-1 gD* 19 39 19.0310201352 +39 55 10.670435976   12.74 12.63     ~ 13 0
28 TYC 3564-2927-1 gD* 19 39 57.1045031568 +50 13 32.046786192   10.16 9.86     F1V 16 0
29 BD+44 3210 Er* 19 40 47.6250694104 +44 20 11.860432548   11.31 11.00     G0 16 0
30 2MASS J19412534+4845150 dS* 19 41 25.3411383552 +48 45 14.990032692           A 34 0
31 TYC 3140-1590-1 gD* 19 42 43.5450213000 +40 15 00.654172164   11.98 11.56     ~ 13 0
32 TYC 3565-1474-1 gD* 19 43 27.8459534976 +49 51 25.396514964   11.96 11.73     F2V 17 0
33 GSC 03136-00730 dS* 19 44 23.9052764784 +39 15 52.226380836   11.972 11.554 11.624   ~ 6 0
34 TYC 3144-1294-1 gD* 19 46 41.5861162776 +42 59 35.301181776   12.58 12.46     F1V 18 0
35 BD+49 3115 Pu* 19 49 50.4959273376 +50 00 57.364523352   10.62 10.21     F0 14 0
36 TYC 3562-121-1 Er* 19 52 37.5094311336 +48 38 43.971786744   10.42 10.02     F5IV 15 0
37 HD 226446 gD* 19 54 04.2405250560 +41 48 31.021976628   10.36 9.96     F1V 16 0
38 2MASS J19544343+4039364 gD* 19 54 43.4360015424 +40 39 36.436683132           ~ 6 0
39 2MASS J19544900+4148135 gD* 19 54 48.9986085624 +41 48 13.570741512           ~ 15 0
40 UCAC3 272-168550 dS* 20 01 57.4414553568 +45 37 15.518521776   14.848 14.212 14.094   F2IV 24 0

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2022.11.28-10:00:55

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