2017A&A...606A..58D


Query : 2017A&A...606A..58D

2017A&A...606A..58D - Astronomy and Astrophysics, volume 606A, 58-58 (2017/10-1)

Activity cycles in members of young loose stellar associations.

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

Abstract (from CDS):

Context. Magnetic cycles analogous to the solar cycle have been detected in tens of solar-like stars by analyzing long-term time series of different magnetic activity indexes. The relationship between the cycle properties and global stellar parameters is not fully understood yet. One reason for this is the lack of long-term time series for stars covering a wide range of stellar parameters.
Aims. We searched for activity cycles in a sample of 90 young solar-like stars with ages between 4 and 95Myr with the aim to investigate the properties of activity cycles in this age range.
Methods. We measured the length Pcyc of a given cycle by analyzing the long-term time series of three different activity indexes: the period of rotational modulation, the amplitude of the rotational modulation and the median magnitude in the V band. For each star, we also computed the global magnetic activity index <IQR> that is proportional to the amplitude of the rotational modulation and can be regarded as a proxy of the mean level of the surface magnetic activity.
Results. We detected activity cycles in 67 stars. Secondary cycles were also detected in 32 stars of the sample. The lack of correlation between Pcyc and Prot and the position of our targets in the Pcyc/Prot-Ro–1 diagram suggest that these stars belong to the so-called transitional branch and that the dynamo acting in these stars is different from the solar dynamo and from that acting in the older Mt. Wilson stars. This statement is also supported by the analysis of the butterfly diagrams whose patterns are very different from those seen in the solar case. We computed the Spearman correlation coefficient rS between Pcyc, <IQR> and various stellar parameters. We found that Pcyc in our sample is uncorrelated with all the investigated parameters. The <IQR> index is positively correlated with the convective turnover timescale, the magnetic diffusivity timescale τdiff, and the dynamo number DN, whereas it is anti-correlated with the effective temperature Teff, the photometric shear ΔΩphot and the radius RC at which the convective zone is located. We investigated how Pcyc and <IQR> evolve with the stellar age. We found that Pcyc is about constant and that <IQR> decreases with the stellare age in the range 4-95Myr. Finally we investigated the magnetic activity of the star AB Dor A by merging All Sky Automatic Survey (ASAS) time series with previous long-term photometric data. We estimated the length of the AB Dor A primary cycle as Pcyc=16.78±2yr and we also found shorter secondary cycles with lengths of 400d, 190d, and 90d, respectively.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: solar-type - starspots - stars: activity - open clusters and associations: general - stars: rotation - stars: magnetic field - stars: magnetic field

VizieR on-line data: <Available at CDS (J/A+A/606/A58): table2.dat table3.dat vmed/* iqr/* prot/*>

Simbad objects: 106

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Number of rows : 106
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 NAME THA As* 00 00 -62.0           ~ 438 0
2 HD 987 Er* 00 13 53.0108292528 -74 41 17.850099516   9.48 8.724   7.933 G8V 100 0
3 Smethells 165 ** 00 24 08.9692009536 -62 11 04.331547384   12.71 11.335 11.076 9.49 M0Ve 64 0
4 HD 3221 Er* 00 34 51.2017857192 -61 54 58.128126444   10.83 9.604   8.238 K4Ve 81 0
5 CD-78 24 Er* 00 42 20.3144575248 -77 47 39.737671044   11.41 10.189   8.994 K3Ve 30 0
6 CPD-64 120 Er* 01 13 15.3419456400 -64 11 35.057118228   11.02 10.213   9.248 K1Ve 31 0
7 V* DK Cet PM* 01 57 48.9775849512 -21 54 05.341104000   8.73 8.057   7.343 G4V 128 1
8 BD-16 351 PM* 02 01 35.5659047928 -16 10 00.917785668   11.32 10.344 9.78 9.349 ~ 31 0
9 HD 13183 SB* 02 07 18.0601078272 -53 11 56.531423652   9.34 8.65   7.87 G7V 82 0
10 BD+05 378 PM* 02 41 25.8882694248 +05 59 18.396173868   11.58 10.271   8.807 K6Ve 102 1
11 CD-58 553 Er* 02 42 33.0252542064 -57 39 36.830791404   12.05 11.004   9.522 K5Ve 51 0
12 V* IS Eri BY* 03 09 42.2876014080 -09 34 46.583173740   9.27 8.49   7.64 G8/K0V 98 0
13 CD-35 1167 Ro* 03 19 08.6661869328 -35 07 00.303058092   12.27 11.12   9.517 K7Ve 30 0
14 CD-46 1064 PM* 03 30 49.1011356768 -45 55 57.363470616   10.67 9.622   8.494 K3V 38 0
15 CD-44 1173 Er* 03 31 55.6413793968 -43 59 13.559704980   12.05 10.927 10.447 9.347 K6Ve 49 0
16 G 80-21 Er* 03 47 23.3412414313 -01 58 19.947831323 14.052 13.048 11.537 10.452 9.098 M3.0V 112 0
17 BD-20 951 SB* 04 52 49.5205884288 -19 55 01.679458692   11.03 9.908   8.783 ~ 22 0
18 HD 272836 Ro* 04 53 05.2001611416 -48 44 38.732150616   11.67 10.715   9.649 K2V(e) 21 0
19 V* V1005 Ori BY* 04 59 34.8342878424 +01 47 00.669818328   11.48 10.107 9.603 8.239 M0Ve 327 0
20 CD-57 1054 Er* 05 00 47.1296589456 -57 15 25.452888732   11.36 9.977 9.889 8.177 M0Ve 114 0
21 CD-40 1701 Ro* 05 02 30.4260906456 -39 59 13.025142636   11.47 10.56 10.22 9.493 K4V 23 0
22 HD 271037 Ro* 05 06 50.5780873344 -72 21 11.647599228   11.52 10.77   9.827 K0IV 22 0
23 V* AB Dor B ** 05 28 44.4839440512 -65 26 46.035814884     13.0     M5+M5-6 89 0
24 V* AB Dor C LM* 05 28 44.83 -65 26 54.9           M8: 62 0
25 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 994 0
26 V* UX Col RS* 05 28 56.518320 -33 28 15.46824   11.62 10.59 10.26 9.312 K3Ve 32 0
27 V* AT Col BY* 05 37 05.3022359544 -39 32 26.420607096   10.45 9.552   8.567 K1V(e) 28 0
28 CD-52 1363 Er* 05 51 01.1588255856 -52 38 12.688428768   11.51 10.534   9.675 G9IV 18 0
29 HD 42270 Er* 05 53 29.3165563872 -81 56 53.185059492   9.85 9.154   8.185 K0V 40 0
30 V* TY Col RS* 05 57 50.7964287096 -38 04 03.139716828   10.28 9.595   8.765 G6V(e) 36 0
31 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 264 0
32 CD-34 2676 Ro* 06 08 33.8671602552 -34 02 54.947408820   10.99 10.285   9.372 G9Ve 23 0
33 V* AO Men Er* 06 18 28.2078302088 -72 02 41.447954904   11.06 9.809 9.299 8.456 K4Ve 133 0
34 CD-40 2458 Ro* 06 26 06.9121433208 -41 02 53.789757864   10.82 9.99   9.151 K0V 27 0
35 CD-48 2324 Ro* 06 28 06.0768304632 -48 26 52.593107352   11.76 11.08   10.086 G9V 20 0
36 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 442 0
37 CD-61 1439 Er* 06 39 50.0234724000 -61 28 41.530139940 12.224 11.043 9.746 9.11 8.223 K7V(e) 74 0
38 HD 49855 Er* 06 43 46.2456407136 -71 58 35.390963928   9.63 9.055   8.259 G6V 73 0
39 HD 51797 Ro* 06 56 23.5485122448 -46 46 55.087734792   10.65 9.84 9.80 9.21 K0V(e) 36 0
40 HD 55279 Er* 07 00 30.4893149280 -79 41 45.989345904   11.12 10.084   9.014 K2V 58 1
41 CD-42 2906 Ro* 07 01 53.4055070760 -42 27 56.158534944   11.48 10.61   9.621 K1V 19 0
42 CD-57 1709 Ro* 07 21 23.7052557888 -57 20 36.987622800   11.39 10.725   9.772 K0V 25 0
43 CD-48 2972 PM* 07 28 22.0257671592 -49 08 37.667060052   10.53 9.855   8.996 G8V 24 0
44 CD-29 4446 SB* 07 28 51.3552114700 -30 14 49.309736426 12.47 11.60 10.08 9.83 7.885 M1Ve 75 0
45 HD 61005 PM* 07 35 47.4623556456 -32 12 14.045086368   8.96 8.22     G8Vk 210 0
46 CD-63 408 Er* 08 24 05.9961354024 -63 34 02.557010820   10.63 9.96   9.12 G5V 20 0
47 Cl* IC 2391 PMM 7422 Ro* 08 28 45.6336171024 -52 05 26.764840032   11.08 10.525 10.38 9.832 G6 22 0
48 V* EG Cha Or* 08 36 56.2143359952 -78 56 45.633633000   11.82 10.457   9.010 K4Ve 92 0
49 V* V365 Vel BY* 08 40 06.2321644608 -53 38 06.875687760   11.07 10.47 10.44   G0 36 0
50 IC 2391 OpC 08 41 10 -52 59.5           ~ 796 0
51 CD-61 2010 Ro* 08 42 00.4939719000 -62 18 26.406083304   11.94 10.963   10.029 K0V 24 0
52 V* EI Cha Or* 08 42 23.7595500240 -79 04 02.976309552     12.7     K7 60 0
53 NAME eta Cha Association OpC 08 42 33 -78 57.8           ~ 351 0
54 Cl* IC 2391 PMM 756 * 08 43 00.4034079504 -53 54 07.637837904   11.79 11.06 10.90   G9 26 0
55 V* EO Cha Or* 08 44 31.8938144088 -78 46 31.143275076     12.531   10.646 M0 70 0
56 V* EP Cha Or* 08 47 01.6439909496 -78 59 34.380161016     11.1     K5 86 0
57 CD-75 392 TT* 08 50 05.4486135048 -75 54 38.082436848   11.305 10.604 10.493 9.728 G9V 37 0
58 CD-53 2515 Ro* 08 51 56.4051135168 -53 55 56.722599840   11.57 10.65   9.917 G9V 24 0
59 ASAS J085746-5408.6 Ro* 08 57 45.6146969064 -54 08 36.667094100   12.35 11.756   10.635 K2IV(e) 21 0
60 CD-49 4008 EB* 08 57 52.1540799600 -49 41 50.551475820   11.17 10.513   9.692 G9V 19 0
61 CD-54 2499 Ro* 08 59 28.7412638040 -54 46 49.085070348   10.71 10.114   9.362 G5IV 20 0
62 V* V479 Car Ro* 09 23 34.9796267688 -61 11 35.880777564   10.77 10.134   9.181 K1V(e) 41 0
63 ASAS J092854-4101.3 Ro* 09 28 54.1216479263 -41 01 19.142001701   12.40 11.653   10.554 K3V 16 0
64 ASAS J094247-7239.8 Ro* 09 42 47.4258710616 -72 39 49.952424240   13.08 12.301   11.191 K1V 15 0
65 HD 309851 PM* 09 55 58.3179410904 -67 21 21.855027312   10.50 9.852   9.121 G1V 17 0
66 HD 298936 PM* 10 13 14.7724609728 -52 30 54.001503468   10.81 9.763   8.687 K3Ve 58 0
67 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 975 2
68 CPD-69 1432 Ro* 10 53 51.4793390424 -70 02 16.115092764   11.33 10.731   9.971 G2V 11 0
69 CPD-68 1388 Y*O 10 57 49.3755342696 -69 13 59.950499520   11.34 10.310   9.163 K1V(e) 29 0
70 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1791 1
71 NAME TW Hya Association As* 11 01.9 -34 42           ~ 907 0
72 CD-29 8887 TT* 11 09 13.7928873024 -30 01 39.968872752   12.95 11.119 10.642 8.875 M2Ve 121 0
73 V* V1217 Cen BY* 11 21 05.4814169256 -38 45 16.522915140   14.04 12.58 12.34 10.515 M1Ve 75 0
74 CD-34 7390A TT* 11 21 17.2193334624 -34 46 45.503251608   12.88 11.46 11.43 9.57 M1Ve 94 0
75 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 359 0
76 RX J1159.7-7601 TT* 11 59 42.2711847672 -76 01 26.178271284   12.46 11.11   9.858 K4Ve 61 0
77 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 147 1
78 HD 104467 TT* 12 01 39.1168325928 -78 59 16.915311240   9.26 8.466   7.678 G3V(e) 56 0
79 RX J1202.1-7853 TT* 12 02 03.7125300480 -78 53 01.320796464     12.450   10.49 M0e 27 0
80 HD 105923 Y*O 12 11 38.1470604024 -71 10 36.027201000   9.86 9.140   8.286 G8V 29 0
81 V* V1249 Cen TT* 12 15 30.7203201048 -39 48 42.606684144   13.09 11.160 10.919 9.50 M0.5 102 0
82 RX J1220.4-7407 TT* 12 20 21.7911659448 -74 07 39.516658140     12.780   10.52 M1V 36 0
83 CD-74 673 TT* 12 20 34.3777314336 -75 39 28.630039572   11.55 10.588   9.449 K3Ve 33 0
84 ASAS J122105-7116.9 LM* 12 21 04.9986446544 -71 16 49.276835688   13.05 11.73 11.32 10.08 K7V 25 0
85 CD-74 712 TT* 12 39 21.2761289184 -75 02 39.186556764   11.15 10.303   9.197 K3Ve 46 0
86 CD-69 1055 Y*O 12 58 25.5840183960 -70 28 49.148391324   10.77 9.992   8.941 K0Ve 42 0
87 CD-75 652 TT* 13 49 12.9354906672 -75 49 47.448396768   10.22 9.680   8.724 G1V 24 0
88 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 710 0
89 HD 139084 SB* 15 38 57.5566916952 -57 42 27.346084668   8.78 7.977   7.106 K0V 154 0
90 HD 155555 RS* 17 17 25.5053342232 -66 57 03.732141636 7.795 7.499 6.723   6.39 K1Vp 264 2
91 HD 319139 SB* 18 14 10.4818675368 -32 47 34.516836060   11.47 10.68   9.11 K5+K7 341 0
92 HD 168210 EB* 18 19 52.2105321456 -29 16 32.828773368   9.44 8.844 8.505 8.132 G5V 43 0
93 Smethells 20 BY* 18 46 52.5522032160 -62 10 36.612382764   13.07 11.831 11.612 9.99 M1Ve 51 0
94 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 316 0
95 CoRoT-2 * 19 27 06.4944378024 +01 23 01.359897468   13.422 12.568 12.204 11.49 G7V+K9V 239 2
96 Kepler-17 Ro* 19 53 34.8643397568 +47 48 54.049530564   14.6   13.6   G5V 139 1
97 CD-52 9381 LM* 20 07 23.7707562384 -51 47 27.266582652   11.57 10.608   9.087 K6Ve 27 0
98 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1056 0
99 HD 358623 BY* 20 56 02.738688 -17 10 53.80428   11.603 10.625 10.18 8.847 K7 92 0
100 HD 202917 Er* 21 20 49.9576157736 -53 02 03.155667216   9.32 8.67   7.882 G7V 162 0
101 Smethells 86 Er* 21 44 30.1227174024 -60 58 38.894635668 14.163 13.00 11.628 10.715 9.815 M0Ve 66 0
102 CD-86 147 PM* 23 27 49.3975525344 -86 13 18.707579544   10.03 9.317   8.479 G8IV 20 0
103 BPM 82931 Er* 23 32 30.8611320024 -12 15 51.462942408   12.38 10.639 10.320 8.646 M0Ve 67 0
104 HD 222575 Er* 23 41 54.2923187616 -35 58 39.809450460   10.07 9.411   8.599 G8V 37 0
105 NAME Octans Association As* ~ ~           ~ 83 0
106 NAME Argus Association As* ~ ~           ~ 212 0

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2023.02.08-01:48:59

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