Recovering facular areas through Doppler imaging

被引:2
作者
Aarum-Ulvås, V
机构
[1] Res Council Norway, N-0131 Oslo, Norway
[2] Astrophys Inst Potsdam, D-14482 Potsdam, Germany
[3] Inst Theoret Phys, N-0315 Oslo, Norway
来源
ASTRONOMY & ASTROPHYSICS | 2005年 / 435卷 / 03期
关键词
methods : data analysis; techniques : spectroscopic; stars : activity; stars : atmospheres; stars : imaging stars : starspots;
D O I
10.1051/0004-6361:20041425
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Similar to the Sun, stellar active regions appear to consist of dark spots in combination with surrounding bright facular regions. The present study uses the Doppler imaging technique to recover the stellar surface structures from simulated spectral observations obtained from a given theoretical stellar surface. The objective of the study is to investigate how the recovered surface structure depends on observing parameters such as rotational phase coverage, choice of spectral lines, signal-to-noise ratio, and projected equatorial rotational velocity. The inversions demonstrate that those stellar surface active regions with high temperature contrast in both longitudinal and latitudinal directions can be satisfactorily reproduced using Doppler imaging. Observations must, however, fulfill such strict conditions that a complete reconstruction is somewhat unrealistic. Nevertheless, in a more realistic example, the hot facular areas result in quite distinct and easily recognizable features on the stellar surface map, even though they are not completely reconstructed.
引用
收藏
页码:1063 / 1071
页数:9
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