1997A&A...323..151O


Query : 1997A&A...323..151O

1997A&A...323..151O - Astronomy and Astrophysics, volume 323, 151-157 (1997/7-1)

On the cycle periods of stellar dynamos.

OSSENDRIJVER A.J.H.

Abstract (from CDS):

We show that the cycle periods (Pcyc) of slowly rotating lower main-sequence stars with well-defined periodic chromospheric activity can be parametrized by the rotation period Prot and the convective turnover time τc through a relation of the form Pcyc∝Protbτcc, with b=2.0±0.3 and c=-2.0±0.3. This suggests a common dynamo mechanism for slowly rotating stars lower main-sequence stars. Using a simple linear mean-field dynamo model, we are able to reproduce the observed relation if {DELTA}{OMEGA}, the total difference in angular velocity along the radial direction, scales as {DELTA}{OMEGA}∝Protp with p=1.1±0.2, and if the α-coefficient scales as α∝Roq with q=-5.1±0.6. This would suggest that, with increasing rotation rate, differential rotation decreases while |α| rapidly increases.

Abstract Copyright:

Journal keyword(s): stars: magnetic fields - stars: activity - stars: late-type - MHD

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * 54 Psc PM* 00 39 21.8053928046 +21 15 01.712899720 7.29 6.71 5.88 5.21 4.82 K0.5V 548 1
2 HD 4628 PM* 00 48 22.9759750919 +05 16 50.209484954 7.22 6.64 5.74 4.99 4.52 K2.5V 471 0
3 HD 9562 PM* 01 33 42.8357181696 -07 01 31.238801760 6.61 6.40 5.76     G1V 250 0
4 * 107 Psc PM* 01 42 29.7625251280 +20 16 06.645657710 6.57 6.08 5.24 4.55 4.12 K1V 527 0
5 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1171 1
6 HD 16160 PM* 02 36 04.9013368983 +06 53 12.383654295   6.81   5.2   K3V 513 1
7 * omi02 Eri Er* 04 15 16.3196189945 -07 39 10.330779018 5.69 5.25 4.43 3.74 3.29 K0V 774 0
8 HD 32147 PM* 05 00 48.9993452248 -05 45 13.224327192 8.27 7.27 6.21 5.36 4.87 K3+V 432 1
9 HD 81809 SB* 09 27 46.8088908054 -06 04 17.008787302           G1.5IV-V 286 0
10 HD 103095 PM* 11 52 58.7673387755 +37 43 07.254113125 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 768 1
11 HD 115404 PM* 13 16 51.0514297623 +17 01 01.840901307   7.69 6.66     K2V 264 0
12 * lam Ser PM* 15 46 26.6142121632 +07 21 11.047378824 5.13 5.03 4.42 3.92 3.60 G0-V 552 0
13 * rho CrB PM* 16 01 02.6604891411 +33 18 12.639472357   6.01   5.0   G0+VaFe-1 609 1
14 HD 152391 PM* 16 52 58.8025159848 -00 01 35.118396116   7.40 6.64     G8.5Vk: 351 0
15 V* V2215 Oph RS* 17 16 13.3624141798 -26 32 46.136563394   7.50 6.34   4.8 K5V 290 0
16 HD 160346 SB* 17 39 16.9163262 +03 33 18.875718   7.496 6.525 5.9   K3-V 283 0
17 HD 166620 PM* 18 09 37.4162111401 +38 27 27.998016381 7.86 7.27 6.40 5.63 5.14 K2V 406 0
18 * 61 Cyg A BY* 21 06 53.9395895022 +38 44 57.902349973 7.50 6.39 5.21 4.19 3.54 K5V 991 0
19 * 61 Cyg B Er* 21 06 55.2638444466 +38 44 31.358519864 8.63 7.40 6.03 4.86 3.55 K7V 694 1
20 * 94 Aqr B PM* 23 19 06.5609055384 -13 27 18.901354254         8.37 K2 76 1
21 * 94 Aqr SB* 23 19 06.7191981624 -13 27 31.825994400   5.95 5.18     G8.5IV 202 0

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2022.05.23-10:48:33

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