2016A&A...592A..15C


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.14CEST14:12:34

2016A&A...592A..15C - Astronomy and Astrophysics, volume 592A, 15-15 (2016/8-1)

The dependence of convective core overshooting on stellar mass.

CLARET A. and TORRES G.

Abstract (from CDS):

Context. Convective core overshooting extends the main-sequence lifetime of a star. Evolutionary tracks computed with overshooting are very different from those that use the classical Schwarzschild criterion, which leads to rather different predictions for the stellar properties. Attempts over the last two decades to calibrate the degree of overshooting with stellar mass using detached double-lined eclipsing binaries have been largely inconclusive, mainly because of a lack of suitable observational data.
Aims. We revisit the question of a possible mass dependence of overshooting with a more complete sample of binaries, and examine any additional relation there might be with evolutionary state or metal abundance Z.
Methods. We used a carefully selected sample of 33 double-lined eclipsing binaries strategically positioned in the H-R diagram with accurate absolute dimensions and component masses ranging from 1.2 to 4.4M. We compared their measured properties with stellar evolution calculations to infer semi-empirical values of the overshooting parameter αov for each star. Our models use the common prescription for the overshoot distance dovovHp, where Hp is the pressure scale height at the edge of the convective core as given by the Schwarzschild criterion, and αov is a free parameter.
Results. We find a relation between αov and mass, which is defined much more clearly than in previous work, and indicates a significant rise up to about 2M followed by little or no change beyond this mass. No appreciable dependence is seen with evolutionary state at a given mass, or with metallicity at a given mass although the stars in our sample span a range of a factor of ten in [Fe/H], from -1.01 to +0.01.

Abstract Copyright: © ESO, 2016

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

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 OGLE SMC-ECL- 195 Al* 00 33 47.9302342963 -73 04 28.056208706 18.39 18.09 16.99   15.55 ~ 11 0
2 OGLE J004402.68-725422.5 Al* 00 44 02.6740731071 -72 54 22.961589680 18.63 17.85 16.65   15.45 ~ 12 0
3 * 21 Cas Al* 00 45 39.0741754240 +74 59 17.056290402   5.717 5.652     A2IV 198 0
4 OGLE SMC-ECL- 1421 Al* 00 48 22.6943827704 -72 48 48.978899980   17.94 17.17 16.81 16.22 ~ 14 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9082 1
6 OGLE SMC-ECL- 4152 Al* 01 00 18.0421545518 -72 24 07.781963264   16.07 15.21 14.69 14.21 ~ 14 0
7 OGLE SMC-ECL- 5123 Al* 01 06 10.33 -72 06 25.2     15.769 15.16 14.702 ~ 15 0
8 V* AI Phe Al* 01 09 34.1924817079 -46 15 56.074292976   9.26 8.60     G3V 117 0
9 OGLE LMC-ECL-1866 EB* 04 52 15.2764733790 -68 19 10.227539091     15.986 15.453 15.010 ~ 17 0
10 OGLE LMC-CEP-227 cC* 04 52 15.6982549282 -70 14 31.242341027     15.317   14.438 ~ 46 0
11 OGLE LMC-ECL-3160 LP* 04 55 51.4785449659 -69 13 47.923542825     16.83 15.978 15.869 ~ 21 0
12 2MASS J05043288-6920509 LP* 05 04 32.8762911382 -69 20 51.028896242     15.62 14.736 14.659 ~ 20 0
13 OGLE J051019.64-685812.3 EB* 05 10 19.65 -68 58 12.0     16.673   15.715 ~ 27 0
14 OGLE LMC-ECL-9144 EB* 05 10 23.30 -69 00 35.3     19.291   19.209 ~ 5 0
15 2MASS J05114945-6705451 LP* 05 11 49.4661000444 -67 05 45.128808383     16.21 15.70 15.130 ~ 17 0
16 2MASS J05140190-6841184 LP* 05 14 01.908 -68 41 18.41     16.58 16.04 15.377 ~ 17 0
17 2MASS J05140595-6915568 LP* 05 14 05.9512534732 -69 15 56.786389344     16.56 15.639   ~ 17 1
18 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1133 0
19 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14316 1
20 2MASS J05252555-6933044 LP* 05 25 25.550 -69 33 04.49     17.01 16.40 15.620 ~ 21 0
21 OGLE LMC-SC16 119952 cC* 05 36 04.456 -70 01 55.66     16.88 16.23 15.743 F4II+K1III-II 21 1
22 HD 38735 Al* 05 47 26.8899569020 -10 31 58.608868246   6.18 6.06     A2IV 105 0
23 OGLE LMC-CEP-4506 cC* 05 53 29.3579743272 -67 53 59.360079055     15.459   14.778 ~ 15 0
24 OGLE LMC-ECL-25658 EB* 06 01 58.7796308511 -68 30 55.139182728     16.995 16.53 15.870 G8III+G9III 13 0
25 V* AI Hya Al* 08 18 47.4972775781 +00 17 00.613256146   9.77 9.35     F2m+F0V 98 0
26 V* AY Cam Al* 08 25 51.7868721897 +77 13 06.848940127   10.12 9.72     A0V+F0V 54 0
27 * chi02 Hya bL* 11 05 57.5701066454 -27 17 16.268460458   5.64 5.71     B8V 104 0
28 V* VV Crv Al* 12 41 15.9524238803 -13 00 50.035083109   6.26 5.843     F4IVn 76 0
29 V* HY Vir Al* 13 08 29.9197792582 -02 40 44.388771340   8.28 7.86     ApSrEuCr 36 0
30 V* SZ Cen Al* 13 50 35.0927038963 -58 29 57.099764696   8.89 8.59     A6III 92 0
31 V* V885 Cyg bL* 19 32 49.8554298227 +30 01 16.977957822   10.20 9.99     Am+Am 35 0
32 V* V380 Cyg Al* 19 50 37.3267138269 +40 35 59.129715394 4.86 5.613 5.680     B1.1III+B2.5/3V: 264 0
33 HD 187669 EB* 19 52 22.0878217240 -32 33 39.742299764   10.12 8.88     K0III 19 0
34 V* EI Cep Al* 21 28 28.2054637198 +76 24 12.583727867   7.94 7.61     F3V+F1m 116 0
35 V* WX Cep Al* 22 31 15.7898100011 +63 31 21.553531992   9.38 9.00     A5V+A2V 94 0
36 V* V364 Lac Al* 22 52 14.8100601555 +38 44 44.632135645   8.54 8.36     A4m+A3m 79 0

    Equat.    Gal    SGal    Ecl

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2019.10.14-14:12:34

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