1995A&A...294..715O

Query : 1995A&A...294..715O

1995A&A...294..715O - Astronomy and Astrophysics, volume 294715-722 (1995/2-3)

New observational limits on dynamo saturation in young solar-type stars.

O'DELL M.A., PANAGI P., HENDRY M.A. and COLLIER CAMERON A.

Abstract (from CDS):

We present statistically robust observational evidence which imposes new limits on dynamo saturation in young solar-type stars. These are inferred from the increasing amplitude of the V-band optical flux with rotation, caused by the filling of the disc with surface spots in a non-axisymmetric pattern. Assuming spot coverage acts as a tracer of the total magnetic surface flux, we find a minimum saturation level between 6-10 times greater than that inferred from chromospheric and transition line indicators, assuming that saturation occurs. We suggest that these new limits imply a minimum rotation for saturation of the dynamo and that for high rotation rates starspot coverage acts as an alternative diagnostic for the stellar dynamo to the chromospheric and transition region line emission fluxes. The fact that the dynamo does not appear to saturate at the lower rotation rates indicated by chromospheric indicators should assist evolutionary braking models that have to explain the sudden spin-down of young fast rotating G-dwarfs.

Abstract Copyright: ∼

Journal keyword(s): stars: activity - stars: rotation - stars: magnetic fields - stars: late-type - stars: chromospheres - open clusters and associations: general

Simbad objects: 60

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Number of rows : 60
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 V* V522 Per BY* 03 18 27.4049575488 +47 21 15.385103244   12.26 11.42     G3 48 0
3 V* V523 Per BY* 03 18 50.4642850824 +48 16 03.126543312   13.52       ~ 22 0
4 V* V524 Per BY* 03 18 58.6914978000 +48 50 42.355021776     13.609     K5 32 0
5 V* V525 Per BY* 03 19 02.7579384576 +48 10 59.576839464   12.92       ~ 29 0
6 * kap01 Cet BY* 03 19 21.6964175772 +03 22 12.714979884 5.71 5.52 4.85 4.27 3.91 G5V 948 0
7 V* V526 Per BY* 03 19 57.6810280256 +49 52 06.826530073   13.16       ~ 35 0
8 V* V527 Per BY* 03 20 01.2752430432 +46 53 01.103017128   13.69       ~ 16 0
9 V* V528 Per BY* 03 21 16.0681180463 +48 35 07.229481475   13.93       ~ 25 0
10 V* V529 Per BY* 03 22 06.8239849885 +47 34 06.690341597   12.76 11.64     K2 26 0
11 V* V484 Per BY* 03 22 21.9201012551 +49 08 27.732216837   12.07 11.37     G6V 78 0
12 V* V485 Per BY* 03 24 25.1123343624 +48 48 21.120434568   15.41 14.12     K5 39 0
13 V* V530 Per BY* 03 24 48.3831600744 +48 53 19.834031868   12.53       G8V 36 0
14 V* V531 Per BY* 03 24 49.7161166568 +48 52 18.296130288   12.41 11.62     G5 67 0
15 2MASS J03261639+4850284 Y*O 03 26 16.4037441384 +48 50 28.378535208   13.57 12.61     ~ 38 0
16 V* V532 Per BY* 03 26 22.2275044296 +49 25 37.501937904   11.98 11.27     G2-3V 76 0
17 V* V486 Per BY* 03 26 27.6565713168 +49 02 12.376063176   13.81 12.84     ~ 39 0
18 V* V487 Per BY* 03 27 23.3200091938 +48 22 24.564083842   14.08 12.86 12.82   ~ 37 0
19 V* V534 Per BY* 03 27 51.0409823520 +49 12 10.044080460   13.21 12.29     K2 36 0
20 V* V488 Per BY* 03 28 18.6829779012 +48 39 48.191915231   13.83 12.83   11.95 K0 60 0
21 V* V536 Per BY* 03 28 48.4904384760 +49 11 54.214693224   14.00       ~ 29 0
22 V* V489 Per RR* 03 30 22.5031162374 +48 24 41.305843822   15.63 14.31     ~ 30 0
23 V* V689 Per BY* 03 32 10.2250397496 +49 08 28.764388392   13.13 11.99     G5V 40 0
24 V* V537 Per BY* 03 32 30.6927252072 +49 10 34.585590360   13.79 11.89     G8 44 0
25 V* V540 Per BY* 03 36 22.0349113608 +49 09 20.817094139   12.61 11.57     K0 31 0
26 V* V541 Per BY* 03 36 53.6599882956 +48 23 58.020425682   13.05 12.13 12.13   ~ 26 0
27 V* V542 Per BY* 03 40 33.9235970480 +48 04 35.791781309           ~ 24 0
28 V* V810 Tau BY* 03 43 02.9441671032 +24 40 11.149283892 15.149 12.97 12.03   10.98 G8 105 0
29 V* V963 Tau BY* 03 43 37.7294586035 +23 32 09.560933897 11.82 11.4 10.6     G5V 95 0
30 V* V966 Tau BY* 03 44 11.2145003449 +23 22 45.575870257   12.30 11.46     G8e 140 0
31 V* V1038 Tau BY* 03 44 20.0898026175 +24 47 46.205031064   11.2 10.4 10.3   G1-2V 162 0
32 V* V632 Tau Y*O 03 44 21.9055121220 +24 46 06.290599502   14.14 13.10 12.81   K4 106 0
33 V* V811 Tau BY* 03 45 21.1862906887 +23 43 38.888404751 14.771 13.67 12.57   11.24 G5 102 0
34 V* OU Tau Y*O 03 45 32.9384507670 +24 18 11.646082836   14.63 13.36   12.02 K4V 122 0
35 V* V1085 Tau BY* 03 45 35.3982230827 +24 04 59.563296540   10.73 11.92 10.04 9.37 F2 103 0
36 V* V855 Tau Y*O 03 45 40.1782648711 +24 37 38.007136109   10.6 9.9   9.05 F9V 108 1
37 V* V969 Tau BY* 03 45 42.1185203606 +24 54 21.622880032   10.18 9.56   8.82 G3 145 1
38 V* V543 Per BY* 03 45 43.4401119112 +46 18 04.316087715   12.75 11.58     ~ 26 0
39 V* V812 Tau BY* 03 46 04.1263211184 +23 24 19.878193476 14.725 13.73 12.66   11.62 K3V 103 0
40 V* V813 Tau BY* 03 46 06.5022556056 +24 34 02.743919580   13.82 12.76 12.66 11.59 G5 101 0
41 V* V814 Tau BY* 03 46 39.3864483531 +24 01 46.867039992   13.04 12.13   11.24 K3V 122 0
42 V* V1065 Tau RS* 03 46 40.2476949658 +23 29 51.877806260 14.016 13.01 12.02   10.93 K0 99 0
43 V* V815 Tau BY* 03 47 13.5327654004 +23 42 51.437976573   13.45 12.41   11.43 K4V 112 0
44 V* QX Tau Y*O 03 47 41.4393422685 +23 58 18.939833580   14.85 13.58   12.11 K5 116 0
45 V* V660 Tau Er* 03 48 28.0289494257 +23 18 02.731712608   13.66 12.60   11.43 K2V 121 0
46 V* V545 Tau Y*O 03 48 49.3174984680 +23 58 38.132788908   13.61 12.65   11.50 K3 97 0
47 V* V664 Tau BY* 03 49 20.5942028352 +24 46 35.976331956   13.71 12.67   11.40 K2.5V 110 0
48 V* V1174 Tau Y*O 03 50 34.5788909903 +24 30 27.979927785   13.60 12.60   11.52 G8 79 1
49 V* V1176 Tau Er* 03 50 54.3588780269 +23 50 05.237700840   12.43 11.48 10.99 10.47 K2 77 0
50 V* V378 Tau Y*O 03 51 05.5717147278 +24 44 12.404879275   15.14 13.89   12.35 M2.3 80 0
51 V* V816 Tau BY* 03 51 53.3859880635 +24 23 13.082093440   13.67 12.69   11.54 K0V 97 0
52 HD 28099 BY* 04 26 40.1217122952 +16 44 48.885808416 8.98 8.78 8.12 7.56 7.23 G2+V 450 0
53 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
54 * chi01 Ori SB* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 895 0
55 * 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
56 * 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
57 V* EK Dra BY* 14 39 00.2104038120 +64 17 29.979649860   8.243 7.604     G5VFe-0.7CH-1(k) 500 0
58 V* PZ Tel BY* 18 53 05.8735056984 -50 10 49.897437168   9.22 8.342   7.464 G9IV 364 0
59 * 15 Sge PM* 20 04 06.2207683221 +17 04 12.676556401   6.390 5.788 5.4   G0V 420 0
60 V* HN Peg BY* 21 44 31.3299461136 +14 46 18.983292600       6.16   G0V+ 561 0

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