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


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:42:55

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 - 2020
#notes
1 NAME THA As* 00 00 -62.0           ~ 340 0
2 HD 987 Ro* 00 13 53.0105874824 -74 41 17.851248731   9.48 8.724   7.933 G8V 79 0
3 Smethells 165 PM* 00 24 08.9765451863 -62 11 04.393080373   12.71 11.335 11.076 9.49 M0Ve 48 0
4 HD 3221 Ro* 00 34 51.2019905484 -61 54 58.129778039   10.83 9.604   8.238 K4Ve 67 0
5 CD-78 24 Ro* 00 42 20.3154071493 -77 47 39.737696603   11.41 10.189   8.994 K3Ve 19 0
6 CPD-64 120 Ro* 01 13 15.3419054655 -64 11 35.057807645   11.02 10.213   9.248 K1Ve 25 0
7 V* DK Cet Ro* 01 57 48.9776543901 -21 54 05.343324011   8.73 8.057   7.343 G4V 116 1
8 BD-16 351 Ro* 02 01 35.5652773691 -16 10 00.909900900   11.32 10.344 9.78 9.349 ~ 21 0
9 HD 13183 PM* 02 07 18.0602017151 -53 11 56.532126551   9.34 8.65   7.87 G7V 66 0
10 BD+05 378 Ro* 02 41 25.8882107790 +05 59 18.394803825   11.58 10.271   8.807 K6Ve 92 1
11 CD-58 553 Ro* 02 42 33.0255319323 -57 39 36.830495001   12.05 11.004   9.522 K5Ve 37 0
12 V* IS Eri BY* 03 09 42.2876652306 -09 34 46.584013998   9.27 8.49   7.64 G8/K0V 80 0
13 CD-35 1167 Ro* 03 19 08.6665060955 -35 07 00.304302638   12.27 11.12   9.517 K7Ve 23 0
14 CD-46 1064 Ro* 03 30 49.1011258865 -45 55 57.364966245   10.67 9.622   8.494 K3V 28 0
15 CD-44 1173 Ro* 03 31 55.6414458623 -43 59 13.561890069   12.05 10.927 10.447 9.347 K6Ve 34 0
16 G 80-21 PM* 03 47 23.3412010775 -01 58 19.945342289 14.052 13.048 11.537 10.452 9.098 M3.0V 81 0
17 BD-20 951 Ro* 04 52 49.5206608271 -19 55 01.675374185   11.03 9.908   8.783 ~ 17 0
18 HD 272836 Ro* 04 53 05.2001829374 -48 44 38.730891965   11.67 10.715   9.649 K2V(e) 17 0
19 V* V1005 Ori BY* 04 59 34.8341800543 +01 47 00.672080375   11.48 10.107 9.603 8.239 M0Ve 301 0
20 CD-57 1054 PM* 05 00 47.1300124315 -57 15 25.453371912   11.36 9.977 9.889 8.177 M0Ve 88 0
21 CD-40 1701 Ro* 05 02 30.4261493683 -39 59 13.024741102   11.47 10.56 10.22 9.493 K4V 17 0
22 HD 271037 Ro* 05 06 50.5785287488 -72 21 11.642857917   11.52 10.77   9.827 K0IV 14 0
23 HD 36705B ** 05 28 44.4833327579 -65 26 46.034324029     13.0     M5+M5-6 87 0
24 HD 36705C * 05 28 44.83 -65 26 54.9           M8: 58 1
25 HD 36705 TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 931 0
26 V* UX Col RS* 05 28 56.518320 -33 28 15.46824   11.62 10.59 10.26 9.312 K3Ve 26 0
27 V* AT Col BY* 05 37 05.2949412158 -39 32 26.475223330   10.45 9.552   8.567 K1V(e) 24 0
28 CD-52 1363 Ro* 05 51 01.1591341579 -52 38 12.687435675   11.51 10.534   9.675 G9IV 10 0
29 HD 42270 Ro* 05 53 29.3170612989 -81 56 53.185140942   9.85 9.154   8.185 K0V 29 0
30 V* TY Col RS* 05 57 50.7956981208 -38 04 03.135781409   10.28 9.595   8.765 G6V(e) 29 0
31 CD-34 2676 Ro* 06 08 33.8679933868 -34 02 54.957639218   10.99 10.285   9.372 G9Ve 15 0
32 NAME Columba Association As* 06 14.0 -40 03           ~ 204 0
33 V* AO Men Ro* 06 18 28.2084971476 -72 02 41.446399943   11.06 9.809 9.299 8.456 K4Ve 113 0
34 CD-40 2458 Ro* 06 26 06.9123290704 -41 02 53.788354883   10.82 9.99   9.151 K0V 17 0
35 CD-48 2324 Ro* 06 28 06.0769454392 -48 26 52.590638846   11.76 11.08   10.086 G9V 13 0
36 CD-61 1439 Ro* 06 39 50.0241378869 -61 28 41.529964006 12.224 11.043 9.746 9.11 8.223 K7V(e) 61 0
37 HD 49855 Ro* 06 43 46.2458255126 -71 58 35.392002354   9.63 9.055   8.259 G6V 55 0
38 HD 51797 Ro* 06 56 23.5485502861 -46 46 55.085809972   10.65 9.84 9.80 9.21 K0V(e) 26 0
39 HD 55279 Ro* 07 00 30.4887886421 -79 41 45.988308717   11.12 10.084   9.014 K2V 42 1
40 CD-42 2906 Ro* 07 01 53.4059392780 -42 27 56.157253619   11.48 10.61   9.621 K1V 15 0
41 CD-57 1709 Ro* 07 21 23.7053549147 -57 20 36.986045945   11.39 10.725   9.772 K0V 17 0
42 CD-48 2972 PM* 07 28 22.0257610739 -49 08 37.664065864   10.53 9.855   8.996 G8V 19 0
43 CD-29 4446 Ro* 07 28 51.37140 -30 14 48.5428 12.47 11.376 9.974 8.945 7.885 M1Ve 63 0
44 HD 61005 PM* 07 35 47.4624262763 -32 12 14.042600581   8.96 8.22     G8Vk 171 0
45 CD-63 408 V* 08 24 05.9949790820 -63 34 02.556994295   10.63 9.96   9.12 G5V 15 0
46 TYC 8162-1020-1 Ro* 08 28 45.6336228446 -52 05 26.762852346   11.08 10.525 10.38 9.832 G6 15 0
47 V* EG Cha Or* 08 36 56.2143612523 -78 56 45.644993177   11.82 10.457   9.010 K4Ve 80 0
48 V* V365 Vel BY* 08 40 06.2326031581 -53 38 06.873693649   11.07 10.47 10.44   G0 31 0
49 IC 2391 OpC 08 40 32 -53 02.0           ~ 714 0
50 CD-61 2010 Ro* 08 42 00.4944708216 -62 18 26.403138609   11.94 10.963   10.029 K0V 17 0
51 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 306 0
52 V* EI Cha Or* 08 42 23.7597511980 -79 04 02.974504684     12.7     K7 50 0
53 Cl* IC 2391 PMM 756 * 08 43 00.4031635455 -53 54 07.634118709   11.79 11.06 10.90   G9 16 0
54 V* EO Cha Or* 08 44 31.8938598641 -78 46 31.142380687     12.531   10.646 M0 61 0
55 V* EP Cha Or* 08 47 01.6438574841 -78 59 34.378576588     11.1     K5 72 0
56 2MASS J08500540-7554380 TT* 08 50 05.4487975343 -75 54 38.079584575   11.30 10.570   9.728 G9V 30 0
57 CD-53 2515 Ro* 08 51 56.4050653215 -53 55 56.720054140   11.57 10.65   9.917 G9V 16 0
58 TYC 8582-3040-1 Ro* 08 57 45.6147397110 -54 08 36.666271135   12.35 11.756   10.635 K2IV(e) 16 0
59 CD-49 4008 EB* 08 57 52.1542955419 -49 41 50.548448882   11.17 10.513   9.692 G9V 15 0
60 CD-54 2499 Ro* 08 59 28.7417992084 -54 46 49.083149190   10.71 10.114   9.362 G5IV 15 0
61 V* V479 Car Ro* 09 23 34.9795566274 -61 11 35.880725963   10.77 10.134   9.181 K1V(e) 31 0
62 TYC 7695-335-1 Ro* 09 28 54.1216479263 -41 01 19.142001701   12.40 11.653   10.554 K3V 13 0
63 TYC 9217-641-1 Ro* 09 42 47.4261344125 -72 39 49.950698153   13.08 12.301   11.191 K1V 12 0
64 HD 309851 Ro* 09 55 58.3178651055 -67 21 21.852540473   10.50 9.852   9.121 G1V 14 0
65 HD 298936 PM* 10 13 14.7723998693 -52 30 54.000802418   10.81 9.763   8.687 K3Ve 51 0
66 NGC 3372 HII 10 44 19.0 -59 53 21           ~ 888 2
67 CPD-69 1432 Ro* 10 53 51.4790380188 -70 02 16.105229010   11.33 10.731   9.971 G2V 9 0
68 CPD-68 1388 pr* 10 57 49.3756466179 -69 13 59.946988654   11.34 10.310   9.163 K1V(e) 25 0
69 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1532 1
70 NAME TW Hya Association As* 11 01.9 -34 42           ~ 819 0
71 CD-29 8887 TT* 11 09 13.8074415397 -30 01 40.070212113   12.95 11.119 10.642 8.875 M2Ve 111 0
72 V* V1217 Cen BY* 11 21 05.4812165874 -38 45 16.521880972   14.04 12.58 12.34 10.515 M1Ve 64 0
73 CD-34 7390A TT* 11 21 17.2193442623 -34 46 45.500772910   12.88 11.46 11.43 9.57 M1Ve 83 0
74 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 332 0
75 RX J1159.7-7601 TT* 11 59 42.2712277320 -76 01 26.175720428   12.46 11.11   9.858 K4Ve 47 0
76 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 120 1
77 HD 104467 TT* 12 01 39.1114993208 -78 59 16.909916962   9.26 8.466   7.678 G3V(e) 50 0
78 2MASS J12020369-7853012 TT* 12 02 03.7197660683 -78 53 01.328413446     12.450   10.49 M0e 23 0
79 HD 105923 pr* 12 11 38.1468993379 -71 10 36.026022010   9.86 9.140   8.286 G8V 25 0
80 V* V1249 Cen TT* 12 15 30.7203284919 -39 48 42.605543199   13.09 11.160 10.919 9.50 M0.5 83 0
81 RX J1220.4-7407 TT* 12 20 21.7903218923 -74 07 39.564137123     12.780   10.52 M1V 33 0
82 2MASS J12203437-7539286 TT* 12 20 34.3973522796 -75 39 28.840802607   11.55 10.588   9.449 K3Ve 30 0
83 ASAS J122105-7116.9 BY* 12 21 04.9982181061 -71 16 49.277088299   13.05 11.73 11.32 10.08 K7V 18 0
84 CD-74 712 TT* 12 39 21.2758227460 -75 02 39.184171990   11.15 10.303   9.197 K3Ve 37 0
85 CD-69 1055 pr* 12 58 25.5836293658 -70 28 49.148845210   10.77 9.992   8.941 K0Ve 33 0
86 2MASS J13491293-7549475 TT* 13 49 12.9346554910 -75 49 47.445082006   10.22 9.680   8.724 G1V 21 1
87 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 557 0
88 HD 139084 Ro* 15 38 57.5579600831 -57 42 27.297738209   8.78 7.977   7.106 K0V 142 0
89 HD 155555 RS* 17 17 25.5047544575 -66 57 03.732827572 7.795 7.499 6.723   6.39 K1Vp 249 2
90 HD 319139 BY* 18 14 10.4818974563 -32 47 34.516106830   11.47 10.68   9.11 K5+K7 290 0
91 HD 168210 EB* 18 19 52.2107643808 -29 16 32.832099665   9.44 8.844 8.505 8.132 G5V 35 0
92 Smethells 20 BY* 18 46 52.5519196041 -62 10 36.614339753   13.07 11.831 11.612 9.99 M1Ve 38 0
93 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 285 0
94 CoRoT-2 * 19 27 06.4944821296 +01 23 01.357597206   13.422 12.568 12.204 11.49 G7V+K9V 211 2
95 Kepler-17 Ro* 19 53 34.8642919207 +47 48 54.049941399   14.6   13.6   G5V 111 1
96 CD-52 9381 Ro* 20 07 23.7708661304 -51 47 27.269407474   11.57 10.608   9.087 K6Ve 19 0
97 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 893 0
98 HD 358623 BY* 20 56 02.738688 -17 10 53.80428   11.603 10.625 10.18 8.847 K7 78 0
99 HD 202917 Ro* 21 20 49.9575453387 -53 02 03.157635940   9.32 8.67   7.882 G7V 135 0
100 Smethells 86 Ro* 21 44 30.1228006899 -60 58 38.894974923 14.163 13.00 11.628 10.715 9.815 M0Ve 50 0
101 CD-86 147 Ro* 23 27 49.4006766449 -86 13 18.707332513   10.03 9.317   8.479 G8IV 16 0
102 BD-13 6424 Ro* 23 32 30.8615303174 -12 15 51.465549870   12.38 10.639 10.320 8.646 M0Ve 54 0
103 HD 222575 Ro* 23 41 54.2922181064 -35 58 39.810892344   10.07 9.411   8.599 G8V 27 0
104 NAME Argus Association As* ~ ~           ~ 162 0
105 NAME Octans Association As* ~ ~           ~ 64 0
106 NAME AB Dor Moving Group MGr ~ ~           ~ 355 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:42:55

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