2005A&A...432..657J


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET00:55:42

2005A&A...432..657J - Astronomy and Astrophysics, volume 432, 657-664 (2005/3-3)

Magnetic activity in the young solar analog AB Dor. Active longitudes and cycles from long-term photometry.

JAERVINEN S.P., BERDYUGINA S.V., TUOMINEN I., CUTISPOTO G. and BOS M.

Abstract (from CDS):

We analyse photometric observations of the young active dwarf AB Dor, spanning more than 20-years. Similar to the young solar analog LQ Hya, AB Dor shows long-lived, nonaxisymmetric spot distribution - active longitudes in opposite hemispheres. The active longitudes migrate nonlinearly in the fixed reference frame, because of the differential rotation and changes of the mean spot latitudes. At least two activity cycles are found in the data. One cycle originates from repeating switches of the activity between the two active longitudes in about (2-3)-year intervals. This results in the flip-flop cycle of about 5.5-years, which includes two consecutive switches. The 5.5-yr cycle also modulates variations of the minimum stellar brightness and the peak-to-peak amplitude, that suggests a periodic redistribution of the spot area between the opposite longitudes and supports the reality of the flip-flop cycle. The other cycle is clearly seen in variations of the mean and maximum stellar brightness on the time-scale of 20-years and is reminiscent of the 11-year sunspot cycle.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: starspots

VizieR on-line data: <Available at CDS (J/A+A/432/657): table2.dat table3.dat>

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3048 0
2 HD 35230 ** 05 17 35.5225517 -68 35 35.292960   8.44 7.59     G8III 33 0
3 HD 35474 PM* 05 20 00.3678561059 -66 03 28.085121734   7.86 7.50     F2/3IV/V 27 0
4 HD 35537 * 05 20 58.8702457015 -64 04 30.040382780   8.85 7.83     K0III 20 0
5 HD 271253 * 05 25 53.6482154733 -65 44 31.967912686   9.40 7.94     K3/4III 20 1
6 V* AB Dor TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 943 0
7 HD 36876 PM* 05 30 15.8732532685 -63 55 39.660592664   6.417 6.190     F0IV 28 0
8 HD 36269 * 05 30 34.6730550511 +00 21 56.032202312   7.80 7.57     A7IV 14 0
9 V* V1093 Ori a2* 05 30 45.2251381983 -00 22 24.085245672   8.15 8.21     ApSi 64 0
10 HD 37279 * 05 32 52.8769410647 -63 27 21.695575218   7.68 7.42     A1mA7-A9 13 0
11 * G Dor SB* 05 32 59.5689417 -64 13 39.063917   6.365 5.341     G8/K0III 54 0
12 HD 37292 * 05 38 29.8860384389 +23 42 38.350500290   9.54 9.06     G5 4 0
13 HD 38616 * 05 41 42.7744406169 -67 24 09.939891254   7.02 7.08     A2Ib/IIp 34 0
14 V* LQ Hya BY* 09 32 25.5684079124 -11 11 04.687410738 9.316 8.761 7.891 7.288 6.815 K1Vp 407 0

    Equat.    Gal    SGal    Ecl

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2021.01.24-00:55:42

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