Monday, June 10, 2013

1306.1600 (FengFei Wang et al.)

The Effects of Spectrograph Slit Modes on the Accuracy of Stellar Radial Velocity Measurement and Atmospheric Parameter Estimation    [PDF]

FengFei Wang, HaoTong Zhang, A-Li Luo, ZhongRui Bai, Bing Du, YongHeng Zhao
Spectrograph slit is conventionally used to enhance the spectral resolution and manage how much light can be allowed to enter spectrograph. A narrower slit provides a higher resolution but sacrifices efficiency of spectrograph and results in a low signal to noise ratio (S/N) spectra product. We take GuoShouJing telescope as an example and carry out a series of experiments to study how its 2/3 slit mode affects the precision of stellar radial velocity measurement and atmosphere parameters estimate. By transforming the resolution and adding a Gaussian White Noise to the extremely high quality spectra from the Sloan Digital Sky Survey, we generate synthetic stellar spectra of various brightness with different S/Ns. Comparing the measurements on these noise added spectra with the original high quality ones, we summarize the influences of the 2/3 slit mode on the measurement accuracy of stellar radial velocity and atmospheric parameters.
View original:

No comments:

Post a Comment