2007A&A...475.1019C


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.15CET19:59:30

2007A&A...475.1019C - Astronomy and Astrophysics, volume 475, 1019-1025 (2007/12-1)

Does convective core overshooting depend on stellar mass? Tests using double-lined eclipsing binaries.

CLARET A.

Abstract (from CDS):

We have selected 13 double-line eclipsing binary systems (DLEBS), strategically positioned in the HR diagram, to infer the mass dependence of the core overshooting parameter αov. In order to compare the data from these DLEBS with the theoretical predictions we computed four grids of evolutionary stellar models with variable amounts of core overshooting (αov=0.0, 0.2, 0.4, and 0.6) in addition to those previously computed. In some particular cases specific models were computed for the precise observed masses. This procedure avoids interpolations and extrapolations, and only considers chemical compositions within the limits of the usual primordial helium abundance and enrichment law. We used the ratio TR=Teff2/Teff1 instead of the effective temperatures themselves as we consider it a much better constrained parameter. This is because it is directly derived from the analysis of light curves and is independent of calibrations, distances, and model atmospheres. In contrast to previous studies on the subject, we have found that standard models or models with moderate core overshooting (αov≃0.2) are able to match the absolute dimensions of key DLEBS such as V380 Cyg or V453 Cyg. The resulting logM-αov diagram indicates that the dependence of αov on mass is more uncertain and less pronounced that previously established. This result is also consistent with the analysis of colour-magnitude diagrams for clusters and with previous comparisons of stellar models with larger samples of DLEBS.

Abstract Copyright:

Journal keyword(s): stars: binaries: eclipsing - stars: evolution - stars: interiors

Simbad objects: 27

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Number of rows : 27

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 * 21 Cas Al* 00 45 39.0741754240 +74 59 17.056290402   5.717 5.652     A2IV 198 0
2 * mu. Cas SB* 01 08 16.39470 +54 55 13.2264 5.93 5.86 5.17 4.55 4.13 G5Vb 537 1
3 NGC 752 OpC 01 57 41 +37 47.1           ~ 526 0
4 V* TZ For Al* 03 14 40.0927132298 -35 33 27.595013257   7.620 6.878     F7III+G8III 112 0
5 SV* HV 2274 EB* 05 02 40.7806907576 -68 24 21.497024742 13.298 13.984 14.127 14.192 14.390 ~ 73 0
6 HD 38735 Al* 05 47 26.8899569020 -10 31 58.608868246   6.18 6.06     A2IV 106 0
7 V* AI Hya Al* 08 18 47.4972775781 +00 17 00.613256146   9.77 9.35     F2m+F0V 98 0
8 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1991 0
9 * 163 Car Al* 09 54 33.8842290875 -58 25 16.572216816 5.6 6.47 6.64     B2V 102 0
10 * chi02 Hya bL* 11 05 57.5701066454 -27 17 16.268460458   5.64 5.71     B8V 105 0
11 V* EM Car Al* 11 12 04.5059542892 -61 05 42.941349454 8.06 8.80 8.54 9.25   O7.5V((f))+O7.5V((f)) 146 0
12 NGC 3680 OpC 11 25 38 -43 14.6   8.40 7.6     ~ 285 0
13 * alf Vir bC* 13 25 11.57937 -11 09 40.7501 -0.20 0.74 0.97 1.06 1.30 B1V 810 2
14 V* SZ Cen Al* 13 50 35.0927038963 -58 29 57.099764696   8.89 8.59     A6III 92 0
15 V* V760 Sco Al* 16 24 43.7186408435 -34 53 37.535017356   7.16 7.05     B4V 140 0
16 V* U Oph Al* 17 16 31.7132736201 +01 12 37.996480495   5.941 5.921     B3V 357 1
17 IC 4651 OpC 17 24 49 -49 56.0           ~ 306 0
18 NGC 6475 OpC 17 53 51 -34 47.6           ~ 329 0
19 V* V906 Sco Al* 17 53 54.7731227 -34 45 09.785378   5.95 5.96     B9V+B9V 117 0
20 HD 165921 Or* 18 09 17.7002679002 -23 59 18.232366605 6.65 7.45 7.31 8.36   O7V(n)z+B0:V: 125 2
21 V* V451 Oph Al* 18 29 14.0426408049 +10 53 31.427616263   7.95 7.91     A0IV 152 0
22 V* DI Her Al* 18 53 26.2400114975 +24 16 40.792385926   8.46 8.47     B5III 233 0
23 V* V380 Cyg Al* 19 50 37.3267138269 +40 35 59.129715394 4.86 5.613 5.680     B1.1III+B2.5/3V: 267 0
24 NGC 6871 OpC 20 05 59 +35 46.6   5.43 5.2     ~ 193 0
25 V* V453 Cyg Al* 20 06 34.9662773363 +35 44 26.267177168 7.83 8.52 8.40     B1III 179 0
26 V* Y Cyg Al* 20 52 03.5773450587 +34 39 27.481355846 6.31 7.23 7.32     O9.5IV+O9.5IV 351 1
27 V* WX Cep Al* 22 31 15.7898100011 +63 31 21.553531992   9.38 9.00     A5V+A2V 94 0

    Equat.    Gal    SGal    Ecl

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2019.12.15-19:59:30

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