862 citations · 5.7k across the 135 of their papers we have counts for
8 papers · 1 filter
Non-LTE line formation for heavy elements in four very metal-poor stars
L. Mashonkina, G. Zhao, T. Gehren +6
Stellar parameters and abundances of Na, Mg, Al, K, Ca, Sr, Ba, and Eu are determined for four very metal-poor stars (-2.66 < [Fe/H] < -2.15) based on non-LTE line formation and an…
Oxygen abundance methods in the SDSS: view from modern statistics
F. Shi, G. Zhao, James Wicker
Our purpose is to find which is the most reliable one among various oxygen abundance determination methods. We will test the validity of several different oxygen abundance determin…
NeIII/OII as an oxygen abundance indicator in the HII regions and HII galaxies
F. Shi, G. Zhao, Y. C. Liang
To calibrate the relationship between Ne3O2 (Ne3O2 = log(\neiii/\oii)) and oxygen abundances, we present a sample of 3000 $\hii$ galaxies from the S…
Soft X-ray emissions of Si IX in Procyon
Guiyun Liang, Gang Zhao
An analysis of transition lines of carbon-like silicon reveals that some ratios of line intensities are sensitive to the electron density. The ratio between two group o…
A Comparative Study on Lithium Abundances in Solar--Type Stars With and Without Planets
Y. Q. Chen, G. Zhao
We have investigated the abundance anomalies of lithium for stars with planets in the temperature range of 5600--5900 K reported by Israelian and coworkers, as compared to 20 norma…
The Type Ic Hypernova SN 2002ap
P. A. Mazzali, J. Deng, K. Maeda +31
Photometric and spectroscopic data of the energetic Type Ic supernova (SN) 2002ap are presented, and the properties of the SN are investigated through models of its spectral evolut…
Modelling the Astronomical Silicate Features: I. On the Spectrum Subtraction Method
Aigen Li, J. Mayo Greenberg, Gang Zhao
The {\it assumption of additive absorptivity} by different components in compound particles is a widely used method applied in the literature to the analysis of the chemical and st…
On the Abundance of Potassium in Metal-Poor Stars
Yoichi Takeda, Gang Zhao, Yu-Qin Chen +2
Based on extensive statistical-equilibrium calculations, we performed a non-LTE analysis of the K {\sc i} 7699 equivalent-width data of metal-deficient stars for the purpose of cla…