搜索结果: 1-15 共查到“天文学 Planetary nebulae”相关记录78条 . 查询时间(0.081 秒)
Abundances in planetary nebulae: NGC1535, NGC6629, He2-108, and Tc1
ISM: abundances – planetary nebulae: individual: NGC1535 & Tc 1 (& IC1266) & NGC6629 & He2-108 – Infrared: ISM: lines and bands
2011/10/12
The aim of the paper is to determine abundances in a group of PNe with uniform morphology. The PNe discussed are circular excited by rather low-temperature central stars. The relation between abundanc...
The formation of fullerenes: clues from new C60, C70, and (possible) planar C24 detections in Magellanic Cloud Planetary Nebulae
formation fullerenes:Magellanic Cloud Planetary Nebulae
2011/10/9
We present ten new Spitzer detections of fullerenes in Magellanic Cloud Planetary Nebulae, including the first extragalactic detections of the C70 molecule. These new fullerene detections together wit...
From Bipolar to Elliptical: Simulating the Morphological Evolution of Planetary Nebulae
From Bipolar Elliptical: Simulating Morphological Evolution Planetary Nebulae
2011/9/27
The majority of Proto-planetary nebulae (PPN) are observed to have bipolar morphologies. The majority of mature PN are observed to have elliptical shapes. In this paper we address the evolution of PPN...
A view of the solar neighbourhood: the local population of planetary nebulae and their mimics
the solar neighbourhood the local population
2011/1/10
We have, for the first time, compiled a nearly complete census of planetary nebulae (PNe) centred on the Sun. Our goal is the generation of an unbiased volume-limited sample, in order to answer some l...
Central Stars of Planetary Nebulae: New spectral classifications and catalogue
Central Stars Planetary Nebulae spectral classifications
2011/1/11
Context. There are more than 3000 true and probable known Galactic Planetary Nebulae (PNe), but only for 13% of them there is central star spectroscopic information available. Aims. To contribute to t...
From pre- to young Planetary Nebulae: radio continuum variability
stars AGB and post-AGB circumstellar matter – radio continuum
2010/11/10
Searching for variability, we have observed a sample of hot post-AGB stars and young Planetary Nebulae candidates with the Very Large Array at 4.8, 8.4, and 22.4 GHz.The sources had been previously de...
Radio-continuum detections of Galactic Planetary Nebulae I. MASH PNe detected in large-scale radio surveys
Radio-continuum Galactic Planetary Nebulae I
2011/1/10
We present an updated and newly compiled radio-continuum data-base for MASH PNe detected in the extant large scale "blind" radio-continuum surveys (NVSS, SUMSS/MGPS-2 and PMN) and, for a small number ...
A Spitzer/IRS spectral study of a sample of galactic carbon-rich proto-planetary nebulae
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/27
Recent infrared spectroscopic observations have shown that proto-planetary nebulae (PPNs) are sites of active synthesis of organic compounds in the late stages of stellar evolution. This paper present...
Wolf-Rayet Central Stars of Planetary Nebulae: Their Evolution and Properties
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
Over the past decade, the number of planetary nebula central stars (CSPN) known to exhibit the Wolf-Rayet (WR) phenomenon has grown substantially. Many of these discoveries have resulted from the Macq...
The Physical Characteristics of Binary Central Stars of Planetary Nebulae
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
A number of efforts are underway to detect close binary stars in planetary nebulae. The primary goal of these studies is to determine the binary fraction of central stars.
New candidate Planetary Nebulae in the IPHAS survey: the case of PNe with ISM interaction
Planetary nebulae ISM interaction survey
2010/3/8
We present the results of the search for candidate Planetary Nebulae interacting with the interstellar medium (PN-ISM) in the framework of the INT Photometric H$\alpha$ Survey (IPHAS) and located in t...
An atlas of synthetic line profiles of planetary nebulae
line profiles synthetic planetary nebulae
2009/7/10
An atlas of synthetic line profiles of planetary nebulae。
A 1.4 GHZ and 14.7 GHZ analysis of density gradients in galactic planetary nebulae
A 1.4 GHZ 14.7 GHZ density gradients galactic planetary nebulae
2009/7/9
A 1.4 GHZ and 14.7 GHZ analysis of density gradients in galactic planetary nebulae。
The Use of KS Band Photometric Excesses to Investigate H2 Emission in Planetary Nebulae
KS Band Photometric Planetary Nebulae H2 Emission
2009/6/30
The Use of KS Band Photometric Excesses to Investigate H2 Emission in Planetary Nebulae。
Galactic Planetary Nebulae with Wolf-Rayet Nuclei III. Kinematical Analysis of a Large Sample of Nebulae
Galactic Planetary Nebulae inematical Analysis Wolf-Rayet Nuclei III
2009/6/30
Galactic Planetary Nebulae with Wolf-Rayet Nuclei III. Kinematical Analysis of a Large Sample of Nebulae。