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A young multipolar planetary nebula in the making—IRAS 21282+5050
Zhang, Yong; Kwok, Sun; Hsia, Chih-Hao +1 more
We present high-angular-resolution Hubble Space Telescope (HST) optical and near-infrared imaging of the compact planetary nebula (PN) IRAS 21282+5050. Optical images of this object reveal several complex morphological structures including three pairs of bipolar lobes and an elliptical shell lying close to the plane of the sky. From near-infrared …
Dust in BL Lac objects and Fanaroff-Riley radio galaxies: infrared region
Seal Braun, P.
Here 28 BL Lac objects, 18 FR I type radio galaxies, 4 FR I/II type radio galaxies and 10 FR II type radio galaxies are studied from FIR (far infrared) to optical region (180 µm to 0.44 µm) to understand the nature of infrared emission from these objects and the physical properties of dust in the emitting region. Using the flux densiti…
Mid- and far-infrared variability of PV Cep
Larionov, V. M.; Arkharov, A. A.; Di Paola, A. +4 more
We present the collection of all the mid- and far-IR observations (λ=3–170 µm) of the young eruptive variable PV Cep available so far in the literature. These data allow us to confirm that flux variability is a prominent feature at mid-IR wavelength (λ=3–25 µm). Color-magnitude plots clearly indicate that the observed variability is no…