2009A&A...501..703O

Query : 2009A&A...501..703O

2009A&A...501..703O - Astronomy and Astrophysics, volume 501703-713 (2009/7-2)

Multiple and changing cycles of active stars. II. Results.

OLAH K., KOLLATH Z., GRANZER T., STRASSMEIER K.G., LANZA A.F., JAERVINEN S., KORHONEN H., BALIUNAS S.L., SOON W., MESSINA S. and CUTISPOTO G.

Abstract (from CDS):

We study the time variations in the cycles of 20 active stars based on decade-long photometric or spectroscopic observations.A method of time-frequency analysis, as discussed in a companion paper, is applied to the data.Fifteen stars definitely show multiple cycles, but the records of the rest are too short to verify a timescale for a second cycle. The cycles typically show systematic changes. For three stars, we found two cycles in each of them that are not harmonics and vary in parallel, indicating a common physical mechanism arising from a dynamo construct. The positive relation between the rotational and cycle periods is confirmed for the inhomogeneous set of active stars.Stellar activity cycles are generally multiple and variable.

Abstract Copyright: ∼

Journal keyword(s): stars: activity - stars: atmospheres - stars: late-type - starspots

Simbad objects: 22

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Number of rows : 22
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 V* XX Tri RS* 02 03 47.1141597864 +35 35 28.665702672   9.52 8.42     K0III 137 0
2 V* UX Ari RS* 03 26 35.3756804760 +28 42 54.226408428 7.76 7.28 6.37     K0IV 726 0
3 HD 22468 RS* 03 36 47.2904292073 +00 35 15.943692002 7.09 6.79 5.90     K2:Vnk 1206 0
4 V* EI Eri RS* 04 09 40.8923562192 -07 53 34.175993568   7.71 7.04     G3V 298 0
5 V* V410 Tau Or* 04 18 31.1081296680 +28 27 16.155955728   12.13 10.75 8.45 9.408 K3Ve 483 0
6 HD 283750 BY* 04 36 48.2421502608 +27 07 55.888214520   9.19 8.10 7.4   K2.5Ve 289 0
7 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
8 V* XY UMa RS* 09 09 55.9354759992 +54 29 17.724193872       9.620   G5 262 0
9 V* IL Hya RS* 09 24 49.0136973144 -23 49 34.714396272   8.38 7.37     K2IV/Vp 176 0
10 V* LQ Hya BY* 09 32 25.5683895648 -11 11 04.692242760 9.316 8.761 7.891 7.288 6.815 K1Vp 480 0
11 HD 95735 PM* 11 03 20.1948195942 +35 58 11.576182057 10.030 8.960 7.520 5.99 4.79 M2+V 795 0
12 * 88 Leo ** 11 31 44.9441592503 +14 21 52.210714391   6.77   5.9   F9.5V 226 0
13 V* HU Vir RS* 12 13 20.6914862928 -09 04 46.880926320   9.69 8.71   7.639 K1V 154 0
14 V* FK Com PM* 13 30 46.7996390256 +24 13 57.781233768   9.04 8.245   7.204 G4III 384 1
15 * ksi Boo B PM* 14 51 23.0436810216 +19 06 06.887747916   7.981 6.816     K5Ve 376 0
16 * ksi Boo A PM* 14 51 23.3884659504 +19 06 01.619801424   5.40 4.675     G7Ve 564 0
17 V* UZ Lib SB* 15 32 23.2091053080 -08 32 00.933064764   10.12 9.115   7.904 K0III 124 1
18 V* EY Dra BY* 18 16 16.7795336184 +54 10 21.732232332   13.69 11.84     dM1.5e 75 0
19 * 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
20 * 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
21 V* HK Lac RS* 22 04 56.6083608840 +47 14 04.479131004   8.01 6.96     K0III 250 0
22 V* IM Peg RS* 22 53 02.2663977960 +16 50 28.300547040   7.024 5.890     K2III 357 1

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