Physical Structure of Planetary Nebulae. III. The Large and Evolved NGC 1360
نویسندگان
چکیده
منابع مشابه
Physical Structure of Planetary Nebulae. Iii. the Large and Evolved Ngc 1360
NGC1360 is a large planetary nebula (PN) without an obvious shell morphology. We have analyzed Hα images and high-dispersion echelle spectra of NGC1360 in order to construct spatio-kinematic models and to determine its density distribution. The best-fit model indicates that NGC 1360 is a prolate ellipsoidal shell whose major axis is twice as long as its minor axis and is tilted by 60 with respe...
متن کاملPhysical Structure of Planetary Nebulae . Ii . Ngc 7662
We present a study of the structure and kinematics of the triple-shell planetary nebula NGC7662 based on long-slit echelle spectroscopic observations and HST archival narrow-band images. The structure of NGC 7662 main nebula consists of a central cavity surrounded by two concentric shells. The bright inner shell has a non-negligible thickness and the highest density in the nebula. The outer she...
متن کاملAbundances in planetary nebulae: NGC 2792
The mid-infrared spectrum of the rather circular planetary nebula NGC 2792 taken with the Spitzer Space Telescope is presented. This spectrum is combined with the ultraviolet IUE spectrum and with the spectrum in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition of the nebula is then calculated in two ways. First by directly calculating ...
متن کاملSpectroscopy of the central stars of three evolved planetary nebulae ?
Abstract. We present results of a spectroscopic project that aims at investigations of stars in the upper left part of the HRD. We observed the central stars of the three old planetary nebulae PN G011.4+17.9, PN G308.2+07.7, and PN G332.5−16.9. The spectra (echelle) were analysed by fitting the H and He ii lines with theoretical profiles from a grid of non-LTE model atmospheres. The models are ...
متن کاملGalactic Planetary Nebulae with Wolf-rayet Nuclei Iii. Kinematical Analysis of a Large Sample of Nebulae
Expansion velocities (Vexp) of different ions and line widths at the base of the lines are measured and analyzed for 24 PNe with [WC]-type nuclei (WRPNe), 9 PNe ionized by WELS (WLPNe) and 14 ordinary PNe. A comparative study of the kinematical behavior of the sample clearly demonstrates that WRPNe have in average 40-45% larger Vexp, and possibly more turbulence than WLPNe and ordinary PNe. WLP...
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: The Astronomical Journal
سال: 2004
ISSN: 0004-6256,1538-3881
DOI: 10.1086/424623