2025A&A...702A.179L

Query : 2025A&A...702A.179L

2025A&A...702A.179L - Astronomy and Astrophysics, volume 702A179 (2025/10-1)

Predicting the length of magnetic cycles in late-type stars II. Solar and stellar butterfly diagrams: A forked dynamo model.

LORENTE R. and MONTESINOS B.

Abstract (from CDS):

Aims. We present a one-dimensional dynamo model, along with its application to a sample of late-type stars with well-determined activity cycles.
Methods. In addition to reproducing the observed dependence of the cycle period, Pcyc, on the stellar rotation period, Prot, for the stars in the sample, the model also reproduces the main properties of the solar butterfly diagram and generates possible magnetic diagrams for the other stars.
Results. The adopted interface dynamo model, which incorporates the essential magnetic generation processes, needs to be modified into a 'forked dynamo' at high latitudes to generate strong magnetic fields near the equator. This simple model offers an intuitive view of the dynamo mechanisms that might be operating in the stellar interiors.

Abstract Copyright: © The Authors 2025

Journal keyword(s): stars: activity - stars: late-type - stars: magnetic field - stars: rotation - stars: solar-type - starspots

Simbad objects: 34

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Number of rows : 34
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 * 9 Cet BY* 00 22 51.7884553555 -12 12 33.969921319 7.29 7.05 6.39     G2.5V 510 0
2 * 54 Psc PM* 00 39 21.8053928046 +21 15 01.712899720 7.29 6.71 5.88 5.21 4.82 K0.5V 630 1
3 HD 4628 PM* 00 48 22.9759750919 +05 16 50.209484954 7.22 6.64 5.74 4.99 4.52 K2.5V 544 0
4 * 107 Psc PM* 01 42 29.7625251280 +20 16 06.645657710 6.57 6.08 5.24 4.55 4.12 K1V 594 0
5 HD 16160 PM* 02 36 04.9013368983 +06 53 12.383654295   6.81   5.2   K3V 583 0
6 * iot Hor PM* 02 42 33.4666679022 -50 48 01.055138166   5.97 5.40     F8V 446 1
7 * kap01 Cet BY* 03 19 21.6964175772 +03 22 12.714979884 5.71 5.52 4.85 4.27 3.91 G5V 948 0
8 HD 22468 RS* 03 36 47.2904292073 +00 35 15.943692002 7.09 6.79 5.90     K2:Vnk 1206 0
9 * omi02 Eri PM* 04 15 16.3196189945 -07 39 10.330779018 5.69 5.25 4.43 3.74 3.29 K0V 879 0
10 HD 32147 PM* 05 00 48.9993452248 -05 45 13.224327192 8.27 7.27 6.21 5.36 4.87 K3+V 500 1
11 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
12 * pi.01 UMa BY* 08 39 11.7046112880 +65 01 15.263122512 6.33 6.26 5.64 5.12 4.79 G0.5V 608 0
13 HD 76151 PM* 08 54 17.9470964696 -05 26 04.054298491 6.89 6.67 6.00     G2V 580 0
14 HD 78366 PM* 09 08 51.0703818408 +33 52 55.986351384   6.53   5.6   G0IV-V 279 0
15 HD 81809 ** 09 27 46.8088908054 -06 04 17.008787302           G1.5IV-V 322 0
16 HD 82443 BY* 09 32 43.7594578944 +26 59 18.706023348   7.78   6.6   G9V(k) 271 1
17 * 88 Leo ** 11 31 44.9441592503 +14 21 52.210714391   6.77   5.9   F9.5V 226 0
18 HD 103095 Pe* 11 52 58.7673387755 +37 43 07.254113125 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 842 1
19 * bet Com PM* 13 11 52.3938268062 +27 52 41.462309460 4.92 4.84 4.25 3.77 3.47 F9.5V 946 0
20 HD 115404 PM* 13 16 51.0514297623 +17 01 01.840901307   7.69 6.66     K2V 316 0
21 V* EK Dra BY* 14 39 00.2104038120 +64 17 29.979649860   8.243 7.604     G5VFe-0.7CH-1(k) 500 0
22 * 18 Sco PM* 16 15 37.2702755653 -08 22 09.982125430   6.15 5.50     G2Va 671 0
23 * 12 Oph BY* 16 36 21.4496896968 -02 19 28.513024233 7.00 6.55 5.77 5.13 4.74 K1V 525 0
24 HD 152391 PM* 16 52 58.8025159848 -00 01 35.118396116   7.40 6.64     G8.5Vk: 396 0
25 V* V2215 Oph RS* 17 16 13.3624141798 -26 32 46.136563394   7.50 6.34   4.8 K5V 334 0
26 HD 160346 SB* 17 39 16.9163262 +03 33 18.875718   7.496 6.525 5.9   K3-V 321 0
27 * 70 Oph A SB* 18 05 27.2484131991 +02 30 00.526614953       3.6   K0V 252 0
28 HD 166620 PM* 18 09 37.4162111401 +38 27 27.998016381 7.86 7.27 6.40 5.63 5.14 K2V 481 0
29 * 15 Sge PM* 20 04 06.2207683221 +17 04 12.676556401   6.390 5.788 5.4   G0V 420 0
30 * 61 Cyg A BY* 21 06 53.9395895022 +38 44 57.902349973 7.50 6.39 5.21 4.19 3.54 K5V 1099 0
31 * 61 Cyg B PM* 21 06 55.2638444466 +38 44 31.358519864 8.63 7.40 6.03 4.86 3.55 K7V 765 0
32 V* HN Peg BY* 21 44 31.3299461136 +14 46 18.983292600       6.16   G0V+ 561 0
33 V* EV Lac PM* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0Ve 993 2
34 * 94 Aqr B PM* 23 19 06.5609055384 -13 27 18.901354254         8.37 K2 96 1

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