2025ApJ...985...46Y

Query : 2025ApJ...985...46Y

2025ApJ...985...46Y - Astrophys. J., 985, 46 (2025/May-3)

Variations in the Magnetic Field Strength of Pre-main-sequence Stars, Solar-type Main-sequence Stars, and the Sun.

YAMASHITA M., ITOH Y. and TORIUMI S.

Abstract (from CDS):

The surface magnetic fields of pre-main-sequence stars and zero-age main-sequence stars are notably strong, resulting in the generation of numerous spots and the emission of bright chromospheric lines. Rotational variations in magnetic field strength have been identified in T Tauri stars (TTSs) and young main-sequence stars using Zeeman-Doppler imaging. This study investigates the relationship between the mean values and variation amplitudes of the magnetic field strengths of TTSs, main-sequence stars, and the Sun. The findings reveal a positive correlation of over 3 orders of magnitude, suggesting that a common mechanism drives the magnetic fields of these stars. This positive correlation implies that stars with larger spot sizes experience greater variation amplitudes due to rotational modulations. For the Sun, both the mean magnetic field strength value and its variation amplitude tend to be higher during solar maximum than during solar minimum.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Stellar astronomy - Starspots - Pre-main sequence stars - Stellar activity - Stellar magnetic fields - Solar magnetic fields

Simbad objects: 84

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Number of rows : 84
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 HD 166 BY* 00 06 36.7840068588 +29 01 17.412693890   6.82 6.07 5.6   G8V 392 0
2 V* PW And RS* 00 18 20.8895755560 +30 57 22.129174872   9.78 8.86 8.3 7.78 K2V 136 1
3 HD 6569 PM* 01 06 26.1533050824 -14 17 47.105517192   10.35 9.52   8.55 K1V 81 0
4 BD-16 351 PM* 02 01 35.5659047928 -16 10 00.917785668   11.32 10.344 9.78 9.349 ~ 41 0
5 HD 13482 ** 02 12 15.41003 +23 57 29.5301   9.01 8.75 8.44   K1III-IV 71 0
6 BD+05 378 PM* 02 41 25.8882694248 +05 59 18.396173868   11.58 10.271   8.807 K6Ve 127 1
7 HD 17925 RS* 02 52 32.1281856011 -12 46 10.968056223 7.48 6.91 6.05 5.34 4.89 K1V 557 0
8 * eta Eri PM* 02 56 25.6492431840 -08 53 53.316500640 5.97 4.99 3.87 3.08 2.50 K1+IIIb 203 0
9 * kap01 Cet BY* 03 19 21.6964175772 +03 22 12.714979884 5.71 5.52 4.85 4.27 3.91 G5V 948 0
10 BD+20 598 ** 03 37 34.9779179832 +21 20 35.451123144   10.282 9.362     K0V 101 1
11 Cl* Melotte 22 PELS 31 ** 03 43 19.035552 +22 26 57.12720   12.81 11.62 11.285 10.396 K0 38 0
12 V* V966 Tau BY* 03 44 11.2145003449 +23 22 45.575870257   12.30 11.46     G8e 140 0
13 V* V969 Tau BY* 03 45 42.1185203606 +24 54 21.622880032   10.18 9.56   8.82 G3 145 1
14 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
15 V* V984 Tau BY* 04 16 33.4775734800 +21 54 26.882025156   9.944 9.125     ~ 195 0
16 V* V410 Tau Or* 04 18 31.1081296680 +28 27 16.155955728   12.13 10.75 8.45 9.408 K3Ve 483 0
17 V* V1023 Tau Or* 04 18 47.0291197872 +28 20 07.493080560   14.31 12.00 11.21   K7 178 0
18 V* V1069 Tau Or* 04 18 51.7036254480 +17 23 16.582694856   13.32 12.22 12.22 10.944 K7e 143 0
19 V* BP Tau Or* 04 19 15.8339827632 +29 06 26.926959492   13.13 12.12 11.89   K5/7Ve 721 0
20 V* V988 Tau BY* 04 23 22.8504016872 +19 39 31.317351336   10.290 9.381     K0 138 0
21 HD 285830 Em* 04 27 47.0352816264 +14 25 03.899709120   10.402 9.475 8.966 8.526 K0 155 0
22 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
23 V* AA Tau Or* 04 34 55.4201902392 +24 28 53.033624580 13.14 13.34 12.20 12.03   K5Ve 801 0
24 V* DN Tau Or* 04 35 27.3776226144 +24 14 58.910343720 13.56 12.88 11.50 11.79   M1:Ve 448 0
25 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
26 HD 240629 ** 05 05 40.3801057412 +06 27 54.724586153   10.849 9.880 9.631   K2 74 0
27 * 111 Tau BY* 05 24 25.4632701888 +17 23 00.726415944   5.52   4.7   F8V 370 0
28 V* CO Ori Or* 05 27 38.3386648 +11 25 38.974625 12.96 12.33 10.30 10.33 9.63 F7Ve 180 0
29 V* GW Ori TT* 05 29 08.3928710640 +11 52 12.666457092   10.83 10.10 9.52   G5/8Ve 382 0
30 V* RY Ori Or* 05 32 09.9419233368 -02 49 46.770599784 12.62 12.76 10.80 10.82 10.34 F7 78 0
31 V* V1044 Ori Or* 05 34 16.4602894440 -05 36 45.644308236 12.701 12.123 11.510   10.417 G5IV/Ve 87 0
32 V* BN Ori Ae* 05 36 29.3484433464 +06 50 02.169401568   10.04 8.80 9.59   F4e 68 0
33 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
34 * chi01 Ori SB* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 895 0
35 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
36 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 337 0
37 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 540 0
38 BD-07 2388 Ro* 08 13 51.0010707504 -07 38 24.864373644   10.18 9.323   8.220 K0 27 0
39 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
40 HD 78366 PM* 09 08 51.0703818408 +33 52 55.986351384   6.53   5.6   G0IV-V 279 0
41 HD 82443 BY* 09 32 43.7594578944 +26 59 18.706023348   7.78   6.6   G9V(k) 271 1
42 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
43 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
44 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
45 HD 96064 BY* 11 04 41.4723234155 -04 13 15.920363614   8.41 7.64     G8V 153 0
46 BD+29 2215 * 11 48 37.6996662552 +28 16 30.534011652   11.15 10.38     G7 34 0
47 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
48 NGP 27 64 * 12 12 53.2353476736 +26 15 01.429093404   12.93 11.40 10.54 9.72 K2.2 37 0
49 BD+24 2462 * 12 27 20.6893226712 +23 19 47.455378752   11.12 10.32 9.83 9.46 G7.9 39 0
50 BD+27 2139 Em* 12 28 56.4263196744 +26 32 57.395882868   11.67 10.8 10.53 10.25 K5.3 55 0
51 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 467 1
52 BD+26 2362 SB* 12 33 42.1222320312 +25 56 33.960999876   11.40 10.59 9.9   G8.0 30 0
53 * tau Boo PM* 13 47 15.7381720026 +17 27 24.809555600 5.02 4.98 4.49 4.09 3.85 F7IV-V 1049 1
54 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
55 V* EK Dra BY* 14 39 00.2104038120 +64 17 29.979649860   8.243 7.604     G5VFe-0.7CH-1(k) 500 0
56 * ksi Boo A PM* 14 51 23.3884659504 +19 06 01.619801424   5.40 4.675     G7Ve 564 0
57 HD 137059 TT* 15 25 16.971744 -38 45 26.44020 9.56 10.13 9.50 9.32 7.99 G3V 25 0
58 HD 139751 ** 15 40 28.3892373004 -18 41 46.240929699     10.070 9.953 8.637 K5V 55 0
59 V* GQ Lup Or* 15 49 12.1053805848 -35 39 05.058139788 12.19 12.76 11.66 11.15   K7Ve 334 1
60 V* NZ Lup BY* 15 53 27.2916958608 -42 16 00.710765508   8.48 7.975   7.213 G2 112 0
61 HD 143006 Or* 15 58 36.9126279888 -22 57 15.220559196   10.92 10.14   8.70 G5IVe 338 0
62 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
63 Wa Oph 1 Or* 16 11 08.9057560608 -19 04 46.976720052     12.073   10.194 K2IV(e) 75 0
64 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
65 BD-18 4244 Or* 16 12 40.5144406080 -18 59 28.267620432   12.15 10.829   9.235 K0IV(e) 97 0
66 NAME Scorpius Cloud MoC 16 29 00 -19 00.0           ~ 37 0
67 NGC 6530 182 Or* 18 03 22.5892512144 -24 22 04.847360232   11.58 10.62   9.55 ~ 12 0
68 NGC 6530 OpC 18 04 31 -24 21.5           ~ 443 0
69 HD 319139 SB* 18 14 10.4818675368 -32 47 34.516836060   11.47 10.68   9.11 K5+K7 423 0
70 CD-26 13904 ** 19 11 44.6658331104 -26 04 08.530229568   11.29 10.20   9.09 K4V(e) 46 0
71 HD 179949 BY* 19 15 33.2300695008 -24 10 45.671448072   6.772 6.237     F8V 435 1
72 V* PX Vul Or* 19 26 40.2532914312 +23 53 50.782579116 12.56 12.57 11.83 10.90 10.30 F3Ve 64 0
73 ASAS J193304+0345.7 PM* 19 33 03.7515646488 +03 45 39.704195160   12.17 11.28 10.78 10.07 ~ 32 0
74 HD 189733 BY* 20 00 43.7129433648 +22 42 39.073143456 9.241 8.578 7.648 7.126 6.68 K2V 991 1
75 BD-03 4778 PM* 20 04 49.3615182672 -02 39 20.389044168   10.935 10.101 10.115 9.133 K1V 47 0
76 HD 190771 PM* 20 05 09.7757965056 +38 28 42.555790200   6.82   5.8   G2V 197 0
77 HD 358623 BY* 20 56 02.738688 -17 10 53.80428   11.603 10.625 10.18 8.847 K7 103 0
78 * 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
79 BD+22 4409 BY* 21 31 01.7140062576 +23 20 07.374015564   10.240 9.245 8.6 7.965 K3Vke 187 0
80 V* HN Peg BY* 21 44 31.3299461136 +14 46 18.983292600       6.16   G0V+ 561 0
81 HD 211472 BY* 22 15 54.1384992984 +54 40 22.406647980   8.33   7.0   K1V 111 0
82 HD 224085 RS* 23 55 04.0520383542 +28 38 01.245426862 8.88 8.20   6.9   K2+IVeFe-1 756 0
83 NAME Hercules-Lyra Moving Group MGr ~ ~           ~ 68 0
84 Ass Vul R 2 As* ~ ~           ~ 4 0

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