Planetary nebula IC 5148 and its ionized halo
نویسندگان
چکیده
منابع مشابه
Kinematics of the strange knots and halo of the planetary nebula IC 4593
Kinematical observations have been made with the Manchester Echelle Spectrometer combined with the San Pedro Mártir telescope of the various features of the strange planetary nebula IC 4593. In particular the outer knots are shown to be inert and extended high-speed flows are found to be emerging from the nebular core. Various models for the whole structure are discussed in the face of these ne...
متن کاملInfrared Spectrum and Abundances of the Planetary Nebula Ic 2448
We present the mid-infrared spectrum of the planetary nebula IC 2448. In order to determine the chemical composition of the nebula, we use the infrared line fluxes from the Spitzer spectrum along with optical line fluxes from the literature and ultraviolet line fluxes from archival IUE spectra. We determine an extinction of CHβ = 0.27 from hydrogen recombination lines and the radio to Hβ ratio....
متن کاملa model for the dynamical and ionization structure of planetary nebula ic 418
the interacting two winds model and a spherical density distribution function are introduced to study the dynamical and ionization structure of the planetary nebula ic 418. a fast wind with a mechanical luminousity 2/34×1034erg.s-1 of interacts with a super wind with a mass-loss rate of 2×10-5m(°)yr-1 and a velocity of 10 , and produces a dense and luminous medium. in this model, the expan...
متن کاملExpansion Parallax of the Planetary Nebula Ic 418
In this paper, we present radio continuum observations of the planetary nebula IC 418 obtained at two epochs separated by more than 20 years. These data allow us to show that the angular expansion rate of the ionization front in IC 418 is 5.8 ± 1.5 mas yr−1. If the expansion velocity of the ionization front is equal to the expansion velocity of the gas along the line of sight as measured by opt...
متن کاملPrecessing Collimated Outflows in the Planetary Nebula Ic 4846
We present [N ii] and Hα images and high resolution long–slit spectra of the planetary nebula IC4846, which reveal, for the first time, its complex structure and the existence of collimated outflows. The object consists of a moderately elongated shell, two (and probably three) pairs of collimated bipolar outflows at different orientations, and an attached circular shell. One of the collimated p...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2018
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201833981