Multiple and changing cycles of active stars II. Results

被引：142

作者：

Olah, K. ^{[1
]}

Kollath, Z. ^{[1
]}

Granzer, T. ^{[2
]}

Strassmeier, K. G. ^{[2
]}

Lanza, A. F. ^{[5
]}

Jarvinen, S. ^{[2
,6
,7
]}

Korhonen, H. ^{[3
]}

Baliunas, S. L. ^{[4
]}

Soon, W. ^{[4
]}

Messina, S. ^{[5
]}

Cutispoto, G. ^{[5
]}

机构：

[1] Hungarian Acad Sci, Konkoly Observ, H-1525 Budapest, Hungary

[2] AIP, D-14482 Potsdam, Germany

[3] ESO, D-85748 Garching, Germany

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[5] Osserv Astrofis Catania, INAF, I-95123 Catania, Italy

[6] Univ Turku, Tuorla Observ, Piikkio 21500, Finland

[7] Univ Oulu, Astron Div, Oulu 90014, Finland

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 501卷 / 02期

关键词：

stars: activity; stars: atmospheres; stars: late-type; starspots; LONG-TERM PHOTOMETRY; MAIN-SEQUENCE STARS; STELLAR ACTIVITY CYCLES; SUN-LIKE STARS; MAGNETIC ACTIVITY; CHROMOSPHERIC VARIATIONS; DIFFERENTIAL ROTATION; FLUX MEASUREMENTS; WAVELET ANALYSIS; HK LACERTAE;

D O I：

10.1051/0004-6361/200811304

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We study the time variations in the cycles of 20 active stars based on decade-long photometric or spectroscopic observations. Methods. A method of time-frequency analysis, as discussed in a companion paper, is applied to the data. Results. 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. Conclusions. Stellar activity cycles are generally multiple and variable.

引用

页码：703 / 713

页数：11

共 55 条

[1]

AARUMULVAS V, 2003, ASTRON ASTROPHYS, V402, P1033

[2] Anharmonic and standing dynamo waves: theory and observation of stellar magnetic activity [J].

Baliunas, S ;

Frick, P ;

Moss, D ;

Popova, E ;

Sokoloff, D ;

Soon, W .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 365 (01) :181-190

[3] Magnetic field and rotation in lower main-sequence stars: An empirical time-dependent magnetic Bode's relation? [J].

Baliunas, S ;

Sokoloff, D ;

Soon, W .

ASTROPHYSICAL JOURNAL, 1996, 457 (02) :L99-L102

[4] A dynamo interpretation of stellar activity cycles [J].

Baliunas, SL ;

NesmeRibes, E ;

Sokoloff, D ;

Soon, WH .

ASTROPHYSICAL JOURNAL, 1996, 460 (02) :848-854

[5] CHROMOSPHERIC VARIATIONS IN MAIN-SEQUENCE STARS .2. [J].

BALIUNAS, SL ;

DONAHUE, RA ;

SOON, WH ;

HORNE, JH ;

FRAZER, J ;

WOODARDEKLUND, L ;

BRADFORD, M ;

RAO, LM ;

WILSON, OC ;

ZHANG, Q ;

BENNETT, W ;

BRIGGS, J ;

CARROLL, SM ;

DUNCAN, DK ;

FIGUEROA, D ;

LANNING, HH ;

MISCH, A ;

MUELLER, J ;

NOYES, RW ;

POPPE, D ;

PORTER, AC ;

ROBINSON, CR ;

RUSSELL, J ;

SHELTON, JC ;

SOYUMER, T ;

VAUGHAN, AH ;

WHITNEY, JH .

ASTROPHYSICAL JOURNAL, 1995, 438 (01) :269-287

[6] Magnetic activity in the young solar analog LQ Hydrae - I. Active longitudes and cycles [J].

Berdyugina, SV ;

Pelt, J ;

Tuominen, I .

ASTRONOMY & ASTROPHYSICS, 2002, 394 (02) :505-515

[7] Butterfly diagram and activity cycles in HR 1099 [J].

Berdyugina, Svetlana V. ;

Henry, Gregory W. .

ASTROPHYSICAL JOURNAL, 2007, 659 (02) :L157-L160

[8] On predicting the solar cycle using mean-field models [J].

Bushby, Paul J. ;

Tobias, Steven M. .

ASTROPHYSICAL JOURNAL, 2007, 661 (02) :1289-1296

[9]

CAMERON R, 2007, APJ IN PRESS

[10]

DETRE L, 1971, INF B VAR STARS, V520

← 1 2 3 4 5 6 →