165 citations · 257 across the 7 of their papers we have counts for
7 papers
Morphological study of the nested planetary nebula Hubble 12
Chih-Hao Hsia, Yong Zhang, SeyedAbdolreza Sadjadi +3
We present a visible-infrared imaging study of young planetary nebula (PN) Hubble 12 (Hb 12; PN G111.8-02.8) obtained with Hubble Space Telescope (HST) archival data and our own Ca…
The spectra of evolved stars at 20--25\,GHz: tracing circumstellar chemistry during the asymptotic giant branch to planetary nebula transition
Yong Zhang, Wayne Chau, Jun-ichi Nakashima +1
We report an unbiased radio line survey towards the circumstellar envelopes of evolved stars at the frequency range from 20 to 25 GHz, aiming to obtain a more complete unbiased pic…
A young multipolar planetary nebula in the making: IRAS 21282+5050
Chih-Hao Hsia, Yong Zhang, Sun Kwok +1
We present high-angular-resolution {\it Hubble Space Telescope (HST)} optical and near-infrared imaging of the compact planetary nebula (PN) IRAS 21282+5050. Optical images of this…
Extended Structures of Planetary Nebulae Detected in H Emission
Xuan Fang, Yong Zhang, Sun Kwok +4
We present narrow-band near-infrared images of a sample of 11 Galactic planetary nebulae (PNe) obtained in the molecular hydrogen (H) 2.122 m and Br 2.166 m emission…
FastChem: A computer program for efficient complex chemical equilibrium calculations in the neutral/ionized gas phase with applications to stellar and planetary atmospheres
J. W. Stock, D. Kitzmann, A. B. C. Patzer +1
For the calculation of complex neutral/ionized gas phase chemical equilibria, we present a semi-analytical versatile and efficient computer program, called FastChem. The applied me…
A Molecular Line Survey of the Carbon-Rich Proto-Planetary Nebula AFGL 2688 in the 3mm and 1.3mm Windows
Yong Zhang, Sun Kwok, Jun-ichi Nakashima +2
We present a spectral line survey of the proto-planetary nebula AFGL 2688 in the frequency ranges of 71-111 GHz, 157-160 GHz, and 218-267 GHz using the Arizona Radio Observatory 12…