منابع مشابه
Molecular Line Observations of Proto-planetary Nebulae
We present our recent results on mm-wave CO observations of proto-planetary nebulae. These include high-resolution interferometric maps of various CO lines in three well known bipolar PPNe: M 1–92, M 2–56 and OH 231.8+4.2. The global properties of the high velocity molecular emission in post-AGB sources have been also studied, by means of high-sensitivity single dish observations of the J=1–0 a...
متن کاملPlanetary Nebulae
Planetary nebulae (PNe) can be used to trace intermediate and old stellar populations in galaxies and the intracluster medium out to approximately 20 Mpc. PNe can be easily identified with narrow-band surveys, and their chemical abundances and radial velocities can be measured with multi-slit or multi-fiber spectrographs. We briefly review what has been accomplished to date, and include tables ...
متن کاملCase studies for planetary nebulae with tilted axes
In this paper we discuss themorphology of two elliptical, point-symmetric planetary nebulae (PNe) with tilted axes: M1-79 and Wei 1-5. By means of simple geometry and the assumption of optical thinness in [OIII] wewere able to reproduce the observational (morphological) data on these two objects.We have constructed three-dimensional models consisting of an inner and an outer ellipsoid which can...
متن کاملIntracluster Planetary Nebulae
We review the progress of research on intracluster planetary nebulae (IPN). In the past five years, hundreds of IPN candidates have been detected in the Virgo and Fornax galaxy clusters and searches are also underway in poorer galaxy groups. From the observations to date, and applying the known properties of extragalactic planetary nebulae, the intracluster light in Virgo and Fornax: 1) is sign...
متن کاملHydrogen-poor planetary nebulae
Five planetary nebulae are known to show hydrogen-poor material near the central star. In the case of A58, this gas was ejected following a late thermal pulse similar to Sakurai. In this paper I will review these five objects. One of them, IRAS 18333−2357, may not be a true PN. I will show that there is a strong case for a relation to the [WC] stars and their relatives, the weak emission-line s...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2016
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921317000497