The point spread function in Lucky Imaging and variations in seeing on short timescales
The point spread function in Lucky Imaging and variations in seeing on short timescales
复制标题
Lucky Imaging 中的点扩散函数和短时间尺度上视宁度的变化
DOI:
10.1051/0004-6361:20079214
复制
发表时间:
2008
影响因子:
6.5
通讯作者:
Baldwin J
中科院分区:
文献类型:
--
作者:
Baldwin J
AimsWe investigate the properties of astronomical images made by combining the best images selected from a sequence of short-exposure frames (Lucky Imaging); we assess the match between modelling and observation and discover what variations in seeing occur on very short timescales.MethodsNumerical simulations of a random phase-changing screen passing across a telescope aperture with ideal optics are used to determine the expected point spread function and isoplanatic properties for a range of seeing conditions for comparison with observations.ResultsAll the model images comprise a diffraction-limited core with Strehl ratios from 0.05–0.5 and an underlying broad disk. The isoplanatic patch sizes are large and coherence times long. The observations are a close match to the models in most respects. Large variations in seeing occur on temporal scales as short as 0.2 s and spatial scales as small as 1 m.
登录
查看更多内容
影响因子:
6.5
作者:
Tubbs, RN;Baldwin, JE;Cox, GC
通讯作者:
Cox, GC
影响因子:
6.5
作者:
J. Baldwin;R. Tubbs;G. C. Cox;C. Mackay;R. Wilson;M. Andersen
通讯作者:
M. Andersen
DOI:
--
发表时间:
2003
期刊:
SPIE Astronomical Telescopes + Instrumentation
影响因子:
--
作者:
C. Mackay;J. Baldwin;R. Tubbs
通讯作者:
R. Tubbs
影响因子:
2.1
作者:
F. Roddier;J. Gilli;J. Vernin
通讯作者:
F. Roddier;J. Gilli;J. Vernin