Search Publications
Discovery of extended structures around two evolved planetary nebulae M2-55 and Abell 2
Zhang, Yong; Hsia, Chih-Hao; Zhang, Xi-Liang +1 more
We report a multi-wavelength study of two evolved planetary nebulae (PNs)M2-55 and Abell 2. Deep optical narrow-band images ([O III], Hα, and [N II]) of M2-55 reveal two pairs of bipolar lobes and a new faint arc-like structure. This arc-shaped filament around M2-55 appears as a well-defined boundary from southwest to southeast, strongly suggestin…
The pc-scale radio structure of MIR-observed radio galaxies
Yuan, Ye; Gu, Min-Feng; Chen, Yong-Jun
We investigated the relationship between the accretion process and jet properties by utilizing very long baseline array (VLBA) and mid-infrared (MIR) data for a sample of 45 3CRR radio galaxies selected with a flux density at 178 MHz > 16.4 {Jy}, 5 GHz very large array (VLA) core flux density ≥ 7 {mJy} and MIR observations. The pc-scale radio s…
Properties of the high-mass star forming region IRAS 22475+5939
Wang, Jun-Jie; Liu, Xiao-Lan
IRAS 22475+5939 has been well studied by previous astronomers, but we can still discover new characteristics about it, using the first observations of the lines from CO J=2-1, 13CO J=2-1 and 13CO J=3-2 by the KOSMA 3m telescope. The mapping of the intensity ratio of 13CO J=3-2 and 13CO J=2-1 shows that t…
Infrared spectral evolution of carbon stars
Chen, Pei-Sheng; Shan, Hong-Guang; Yang, Xiao-Hong
We collected almost all Highly Processed Data Products (HPDP) of ISO SWS01 spectra for the Galactic visual carbon stars, infrared carbon stars, extreme carbon stars and carbon-rich proto-planetary nebulae (PPNs). Those infrared spectra are primarily analyzed and discussed. It is shown that either spectral shapes/peaks, or main molecular/dust featu…
An infrared study of Be stars based on ISO SWS01 spectra
Zhang, Pin; Fu, Zai-Qi
The Infrared Space Observatory (ISO) Short-Wavelength Spectrometer (SWS) spectra of 10 Be stars are presented. It can be seen that the Be stars show a diversity in their ISO SWS01 spectral classifications by Kraemer et al., from naked stars, stars associated with dust, stars with warm dust shells, stars with cool dust shells to very red sources. I…
Spectral variations of carbon stars based on ISO SWS data
Chen, Pei-Sheng; Yang, Xiao-Hong
We investigate the spectral variations of seven carbon stars in the infrared using ISO SWS spectral data. Continuum variations of those carbon stars show that during the central star pulsations when carbon stars become fainter in the infrared, their ISO SWS spectra become redder and the near-IR temperature (Tnir) decreases. When carbon …