FOURIER-ANALYSIS OF SPOTTED STAR LIGHT CURVES AS A TOOL TO DETECT STELLAR DIFFERENTIAL ROTATION

被引：0
|
作者：
LANZA, AF [1 ]
RODONO, M [1 ]
ZAPPALA, RA [1 ]
机构：
[1] OSSERV ASTROFIS CATANIA, I-95125 CATANIA, ITALY
来源：
ASTRONOMY & ASTROPHYSICS | 1993年 / 269卷 / 1-2期
关键词：
STARS; ACTIVITY OF; ATMOSPHERES OF; ROTATION OF; VARIABLE; OBSERVATIONS FROM SPACE;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A model for the simulation of light curves of single magnetically active spotted stars has been developed. Simulated light curves are qualitatively compared to observed ones and quantitatively analysed by means of Fourier analysis. The time variable light modulation induced by an evolving spot pattern on a differentially rotating star is studied in order to test the capability of the Fourier analysis, by the Scargle method, to extract information on differential rotation. Light curve precision of DELTAF/F = 10(-5) - 10(-6), where F is the stellar flux, and uninterrupted time coverage of at least 2pi/DELTAOMEGA, where OMEGA is the angular velocity, prove adequate to detect differential rotation of the order of DELTAOMEGA. Such a result shows the importance of dedicated long term observations by space-borne telescopes.
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页码：351 / 354
页数：4
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