2016A&A...591A..43D

Query : 2016A&A...591A..43D

2016A&A...591A..43D - Astronomy and Astrophysics, volume 591A43-43 (2016/7-1)

Lower limit for differential rotation in members of young loose stellar associations.

DISTEFANO E., LANZAFAME A.C., LANZA A.F., MESSINA S. and SPADA F.

Abstract (from CDS):

Context. Surface differential rotation (SDR) plays a key role in dynamo models and determines a lower limit on the accuracy of stellar rotation period measurements. SDR estimates are therefore essential to constrain theoretical models and infer realistic rotation period uncertainties.
Aims. We measure a lower limit to SDR in a sample of solar-like stars belonging to young loose stellar associations with the aim of investigating how SDR depends on global stellar parameters in the age range (4-95Myr).
Methods. The rotation period of a solar-like star can be recovered by analyzing the flux modulation caused by dark spots and stellar rotation. The SDR and the latitude migration of dark-spots induce a modulation of the detected rotation period. We employed long-term photometry to measure the amplitude of such a modulation and to compute the quantity ΔΩphot=2π/Pmin-2π/Pmax that is a lower limit to SDR.
Results. We find that ΔΩphot increases with the stellar effective temperature and with the global convective turn-over timescale τc, which is the characteristic time for the rise of a convective element through the stellar convection zone. We find that ΔΩphot is proportional to Teff2.18±0.65 in stars recently settled on the ZAMS. This power law is less steep than those found by previous authors, but closest to recent theoretical models. We investigate how ΔΩphot changes in time in a ∼1M☉ star. We find that ΔΩphot steeply increases between 4 and 30Myr and that it is almost constant between 30 and 95Myr. We find also that the relative shear increases with the Rossby number Ro. Although our results are qualitatively in agreement with hydrodynamical mean-field models, our measurements are systematically higher than the values predicted by these models. The discrepancy between ΔΩphot measurements and theoretical models is particularly large in stars with periods between 0.7 and 2d. Such a discrepancy, together with the anomalous SDR measured by other authors for HD 171488 (rotating in 1.31d), suggests that the rotation period could influence SDR more than predicted by the models.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: solar-type - starspots - stars: rotation - open clusters and associations: general - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/591/A43): table2.dat table3.dat table4.dat table5.dat>

Simbad objects: 130

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Number of rows : 130
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME THA MGr 00 00 -62.0           ~ 540 0
2 HD 987 PM* 00 13 53.0108292528 -74 41 17.850099516   9.48 8.724   7.933 G8V 122 0
3 V* FK Psc RS* 00 23 34.666104 +20 14 28.63716   12.24 10.84 10.426   K7.5Ve 41 0
4 Smethells 165 ** 00 24 08.9692009536 -62 11 04.331547384   12.71 11.335 11.076 9.49 M0Ve 76 0
5 HD 3221 SB* 00 34 51.2017857192 -61 54 58.128126444   10.83 9.604   8.238 K4Ve 99 0
6 CD-78 24 PM* 00 42 20.3144575248 -77 47 39.737671044   11.41 10.189   8.994 K3Ve 45 0
7 CPD-64 120 PM* 01 13 15.3419456400 -64 11 35.057118228   11.02 10.213   9.248 K1Ve 36 0
8 V* DK Cet PM* 01 57 48.9775849512 -21 54 05.341104000   8.73 8.057   7.343 G4V 152 0
9 BD-16 351 PM* 02 01 35.5659047928 -16 10 00.917785668   11.32 10.344 9.78 9.349 ~ 41 0
10 HD 13183 SB* 02 07 18.0601078272 -53 11 56.531423652   9.34 8.65   7.87 G7V 99 0
11 CD-46 644 PM* 02 10 55.3914346080 -46 03 58.657073580   12.75 11.14   10.112 K3IVe 25 0
12 BD+30 397 PM* 02 27 29.2543096632 +30 58 24.596323968   11.3 10.12 9.32 8.78 K7V 124 1
13 BD+05 378 PM* 02 41 25.8882694248 +05 59 18.396173868   11.58 10.271   8.807 K6Ve 127 1
14 CD-58 553 PM* 02 42 33.0252542064 -57 39 36.830791404   12.05 11.004   9.522 K5Ve 65 0
15 V* IS Eri BY* 03 09 42.2876014080 -09 34 46.583173740   9.27 8.49   7.64 G8/K0V 120 0
16 CD-35 1167 PM* 03 19 08.6661869328 -35 07 00.303058092   12.27 11.12   9.517 K7Ve 44 0
17 CD-46 1064 PM* 03 30 49.1011356768 -45 55 57.363470616   10.67 9.622   8.494 K3V 53 0
18 HD 21955 ** 03 31 20.7985770402 -30 30 58.712896230   10.60 10.01 9.64 9.20 G7IV 31 0
19 CD-44 1173 PM* 03 31 55.6413793968 -43 59 13.559704980   12.05 10.927 10.447 9.347 K6Ve 66 0
20 G 80-21 PM* 03 47 23.3412414313 -01 58 19.947831323 14.052 13.048 11.537 10.452 9.098 M3.0V 153 0
21 HD 26980 Er* 04 14 22.5713382072 -38 19 01.574486904   9.76 9.069   8.397 G3V 59 0
22 CD-43 1395 ** 04 21 48.687480 -43 17 32.60616   10.809 10.178 10.217 9.373 G7V 19 0
23 CD-36 1785 Ro* 04 34 50.7800567112 -35 47 21.173442684   11.88 10.94   9.857 K1Ve 28 0
24 HD 31242 Ro* 04 51 53.5392748824 -46 47 13.303446108   10.44 9.762   8.872 G5V 34 0
25 BD-20 951 SB* 04 52 49.5205884288 -19 55 01.679458692   11.03 9.908   8.783 ~ 28 0
26 HD 272836 Er* 04 53 05.2001611416 -48 44 38.732150616   11.67 10.715   9.649 K2V(e) 27 0
27 HD 268729 s*b 04 53 43.2832436568 -68 42 53.288900892 10.195 11.05 10.93   10.970 B5Ia+ 48 0
28 V* V1005 Ori BY* 04 59 34.8342878424 +01 47 00.669818328   11.48 10.107 9.603 8.239 M0Ve 371 0
29 CD-57 1054 PM* 05 00 47.1296589456 -57 15 25.452888732   11.36 9.977 9.889 8.177 M0Ve 143 0
30 CD-40 1701 Ro* 05 02 30.4260906456 -39 59 13.025142636   11.47 10.56 10.22 9.493 K4V 28 0
31 BD-21 1074 ** 05 06 49.50216 -21 35 04.3044           M1.5V 30 0
32 BD-21 1074A Er* 05 06 49.9162124448 -21 35 09.128916564   11.86 10.41 9.40 9.07 M2 91 0
33 HD 271037 Er* 05 06 50.5780873344 -72 21 11.647599228   11.52 10.77   9.827 K0IV 29 0
34 CD-30 2310 Er* 05 18 29.0477262312 -30 01 32.156294448   13.00 11.57   10.13 K4Ve 27 0
35 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1080 0
36 HD 274561 V* 05 28 55.0976983704 -45 34 58.417870656   12.66 11.48     K1V(e) 23 0
37 V* UX Col RS* 05 28 56.518320 -33 28 15.46824   11.62 10.59 10.26 9.312 K3Ve 37 0
38 CD-34 2331 Pe* 05 35 04.1122452312 -34 17 51.974833236   12.92 11.760   10.551 K4Ve 23 0
39 V* AT Col BY* 05 37 05.3022359544 -39 32 26.420607096   10.45 9.552   8.567 K1V(e) 31 0
40 CD-38 2198 Er* 05 45 16.2394880520 -38 36 49.197340152   11.64 11.17     G9V 21 0
41 CD-29 2531 Ro* 05 50 21.4355238648 -29 15 20.593890000   12.00 11.164   10.257 K0V(e) 25 0
42 CD-52 1363 Er* 05 51 01.1588255856 -52 38 12.688428768   11.51 10.534   9.675 G9IV 22 0
43 HD 42270 PM* 05 53 29.3165563872 -81 56 53.185059492   9.85 9.154   8.185 K0V 51 0
44 V* TY Col RS* 05 57 50.7964287096 -38 04 03.139716828   10.28 9.595   8.765 G6V(e) 43 0
45 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 337 0
46 CD-34 2676 Ro* 06 08 33.8671602552 -34 02 54.947408820   10.99 10.285   9.372 G9Ve 27 0
47 V* AO Men PM* 06 18 28.2078302088 -72 02 41.447954904   11.06 9.809 9.299 8.456 K4Ve 153 0
48 CD-40 2458 Er* 06 26 06.9121433208 -41 02 53.789757864   10.82 9.99   9.151 K0V 31 0
49 CD-48 2324 Ro* 06 28 06.0768304632 -48 26 52.593107352   11.76 11.08   10.086 G9V 22 0
50 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 540 0
51 CD-61 1439 PM* 06 39 50.0234724000 -61 28 41.530139940 12.224 11.043 9.746 9.11 8.223 K7V(e) 89 0
52 ASAS J064119-3820.6 Er* 06 41 18.4938491352 -38 20 36.054015504   12.27 11.09     K2Ve 21 0
53 HD 49855 PM* 06 43 46.2456407136 -71 58 35.390963928   9.63 9.055   8.259 G6V 92 0
54 HD 51797 Er* 06 56 23.5485122448 -46 46 55.087734792   10.65 9.84 9.80 9.21 K0V(e) 44 0
55 HD 55279 PM* 07 00 30.4893149280 -79 41 45.989345904   11.12 10.084   9.014 K2V 76 1
56 CD-42 2906 Ro* 07 01 53.4055070760 -42 27 56.158534944   11.48 10.61   9.621 K1V 22 0
57 CD-57 1709 Er* 07 21 23.7052557888 -57 20 36.987622800   11.39 10.725   9.772 K0V 33 0
58 CD-48 2972 PM* 07 28 22.0257671592 -49 08 37.667060052   10.53 9.855   8.996 G8V 28 0
59 CD-29 4446 SB* 07 28 51.3552114700 -30 14 49.309736426 12.47 11.60 10.08 9.83 7.885 M1Ve 89 0
60 HD 61005 PM* 07 35 47.4623556456 -32 12 14.045086368   8.96 8.22     G8Vk 265 0
61 CD-63 408 Er* 08 24 05.9961354024 -63 34 02.557010820   10.63 9.96   9.12 G5V 25 0
62 Cl* IC 2391 PMM 7422 Ro* 08 28 45.6336171024 -52 05 26.764840032   11.08 10.525 10.38 9.832 G6 31 0
63 V* EG Cha Or* 08 36 56.2143359952 -78 56 45.633633000   11.82 10.457   9.010 K4Ve 110 0
64 V* V365 Vel BY* 08 40 06.2321644608 -53 38 06.875687760   11.07 10.47 10.44   G0 49 0
65 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
66 CD-61 2010 Er* 08 42 00.4939719000 -62 18 26.406083304   11.94 10.963   10.029 K0V 30 0
67 V* EI Cha Or* 08 42 23.7595500240 -79 04 02.976309552     12.7     M1.5 71 0
68 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
69 Cl* IC 2391 PMM 756 * 08 43 00.4034079504 -53 54 07.637837904   11.79 11.06 10.90   G9 35 0
70 V* EO Cha Or* 08 44 31.8938144088 -78 46 31.143275076     12.531   10.646 M0e 83 0
71 V* EP Cha Or* 08 47 01.6439909496 -78 59 34.380161016     11.1     K5IVe 109 0
72 CD-75 392 TT* 08 50 05.4486135048 -75 54 38.082436848   11.305 10.604 10.493 9.728 G9V 43 0
73 CD-53 2515 Ro* 08 51 56.4051135168 -53 55 56.722599840   11.57 10.65   9.917 G9V 30 0
74 ASAS J085746-5408.6 Ro* 08 57 45.6146969064 -54 08 36.667094100   12.35 11.756   10.635 K2IV(e) 31 0
75 CD-49 4008 EB* 08 57 52.1540799600 -49 41 50.551475820   11.17 10.513   9.692 G9V 25 0
76 CD-54 2499 Ro* 08 59 28.7412638040 -54 46 49.085070348   10.71 10.114   9.362 G5IV 25 0
77 V* V479 Car Er* 09 23 34.9796267688 -61 11 35.880777564   10.77 10.134   9.181 K1V(e) 52 0
78 ASAS J092854-4101.3 Ro* 09 28 54.1241028515 -41 01 19.122268617   12.40 11.653   10.554 K3V 18 0
79 ASAS J094247-7239.8 Ro* 09 42 47.4258710616 -72 39 49.952424240   13.08 12.301   11.191 K1V 18 0
80 HD 309851 PM* 09 55 58.3179410904 -67 21 21.855027312   10.50 9.852   9.121 G1V 20 0
81 HD 298936 PM* 10 13 14.7724609728 -52 30 54.001503468   10.81 9.763   8.687 K3Ve 69 0
82 V* BX Ant TT* 10 18 28.6987521312 -31 50 02.830052544   13.39 11.454 11.382 9.325 M0Ve 130 0
83 CPD-69 1432 Ro* 10 53 51.4793390424 -70 02 16.115092764   11.33 10.731   9.971 G2V 12 0
84 CPD-68 1388 Or* 10 57 49.3755342696 -69 13 59.950499520   11.34 10.310   9.163 K1V(e) 32 0
85 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
86 CD-29 8887 TT* 11 09 13.7928873024 -30 01 39.968872752   12.95 11.119 10.642 8.875 M2Ve 141 0
87 V* V1217 Cen Or* 11 21 05.4814169256 -38 45 16.522915140   14.04 12.58 12.34 10.515 M1Ve 86 0
88 CD-34 7390A TT* 11 21 17.2193334624 -34 46 45.503251608   12.88 11.46 11.43 9.57 M1Ve 111 0
89 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 401 0
90 CD-26 8623 TT* 11 32 41.2658824800 -26 51 55.961893800   13.69 12.23 11.14 9.637 M3Ve 118 0
91 CD-36 7429A TT* 11 48 24.2227406904 -37 28 49.114270524   12.54 11.17 10.92 9.552 K5V 145 0
92 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 98 0
93 RX J1159.7-7601 TT* 11 59 42.2711847672 -76 01 26.178271284   12.46 11.11   9.858 K4Ve 71 0
94 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 188 0
95 HD 104467 TT* 12 01 39.1168325928 -78 59 16.915311240   9.26 8.466   7.678 G3V(e) 62 0
96 RX J1202.1-7853 TT* 12 02 03.7125300480 -78 53 01.320796464     12.450   10.49 M0e 32 0
97 HD 105923 Or* 12 11 38.1470604024 -71 10 36.027201000   9.86 9.140   8.286 G8V 36 0
98 HD 106506 Or* 12 15 18.5537332944 -63 25 30.330934464   9.06 8.46     G1V 70 0
99 V* V1249 Cen TT* 12 15 30.7203201048 -39 48 42.606684144   13.09 11.160 10.919 9.50 M0.5 139 0
100 RX J1220.4-7407 TT* 12 20 21.7911659448 -74 07 39.516658140     12.780   10.52 M1V 42 0
101 CD-74 673 TT* 12 20 34.3777314336 -75 39 28.630039572   11.55 10.588   9.449 K3Ve 41 0
102 ASAS J122105-7116.9 LM* 12 21 04.9986446544 -71 16 49.276835688   13.05 11.73 11.32 10.08 K7V 30 0
103 CD-74 712 TT* 12 39 21.2761289184 -75 02 39.186556764   11.15 10.303   9.197 K3Ve 52 0
104 CD-69 1055 Or* 12 58 25.5840183960 -70 28 49.148391324   10.77 9.992   8.941 K0Ve 50 0
105 CD-75 652 TT* 13 49 12.9354906672 -75 49 47.448396768   10.22 9.680   8.724 G1V 29 0
106 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
107 V* LQ Lup TT* 15 08 37.7353724976 -44 23 17.049423444 11.46 11.54 10.645 10.22 9.804 G8IVe 97 0
108 HD 139084 SB* 15 38 57.5566916952 -57 42 27.346084668   8.78 7.977   7.106 K0V 174 0
109 HD 155555 RS* 17 17 25.5053342232 -66 57 03.732141636 7.795 7.499 6.723   6.39 G5V+K1V 292 1
110 HD 319139 SB* 18 14 10.4818675368 -32 47 34.516836060   11.47 10.68   9.11 K5+K7 423 0
111 V* EY Dra BY* 18 16 16.7795336184 +54 10 21.732232332   13.69 11.84     dM1.5e 75 0
112 HD 168210 EB* 18 19 52.2105321456 -29 16 32.828773368   9.44 8.844 8.505 8.132 G5V 58 0
113 V* V889 Her BY* 18 34 20.1028767504 +18 41 24.234675864   8.00 7.449   6.720 G2V 151 0
114 Smethells 20 BY* 18 46 52.5522032160 -62 10 36.612382764   13.07 11.831 11.612 9.99 M1Ve 64 0
115 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 364 0
116 CD-26 13904 ** 19 11 44.6658331104 -26 04 08.530229568   11.29 10.20   9.09 K4V(e) 46 0
117 CD-52 9381 LM* 20 07 23.7707562384 -51 47 27.266582652   11.57 10.608   9.087 K6Ve 33 0
118 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1344 0
119 HD 358623 BY* 20 56 02.738688 -17 10 53.80428   11.603 10.625 10.18 8.847 K7 103 0
120 HD 202917 PM* 21 20 49.9576157736 -53 02 03.155667216   9.32 8.67   7.882 G7V 191 0
121 Smethells 86 PM* 21 44 30.1227174024 -60 58 38.894635668 14.163 13.00 11.628 10.715 9.815 M0Ve 86 0
122 V* WW PsA BY* 22 44 57.9628374984 -33 15 01.744541676 14.583 13.627 12.111 10.916 9.109 M4IVe 142 0
123 V* HK Aqr BY* 23 08 19.5510173448 -15 24 35.766079704 13.4 12.282 10.872 9.964 9.019 M0Ve 219 0
124 HD 218860 PM* 23 11 52.0534851600 -45 08 10.631426784   9.52 8.782   7.930 G8V 85 0
125 CD-86 147 PM* 23 27 49.3975525344 -86 13 18.707579544   10.03 9.317   8.479 G8IV 27 0
126 BD-13 6424 PM* 23 32 30.8611320024 -12 15 51.462942408   12.38 10.639 10.320 8.646 M0Ve 89 0
127 HD 222575 PM* 23 41 54.2923187616 -35 58 39.809450460   10.07 9.411   8.599 G8V 45 0
128 NAME Octans Association As* ~ ~           ~ 101 0
129 NAME Carina Association As* ~ ~           ~ 188 1
130 NAME Argus Association As* ~ ~           ~ 266 0

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