Results 41 to 50 of about 191,657 (282)
Planetary Nebulae as Sources of Chemical Enrichment of the Galaxy
Frontiers in Astronomy and Space Sciences, 2022 During the late asymptotic giant branch (AGB) phase of stellar evolution, the element carbon is created through the triple-α nuclear reaction. This is followed by the synthesis of other heavy elements via neutron capture in the core and the dredge-up of ...
Sun Kwok, Sun Kwok
doaj +1 more source
Annual Review of Astronomy and Astrophysics, 1993 The progress in the search for proto-planetary nebulae (PPN) in the last 5 years is reviewed. An observational definition of PPN is developed and a list of current PPN candidates is given. The optical, infrared, and radio properties of PPN are summarized and compared with theoretical models.
openaire +3 more sources
Distinguishing between symbiotic stars and planetary nebulae [PDF]
, 2017 Number of known symbiotic stars (SySt) is still significantly lower than their predicted population. One of the main problems in finding complete population of SySt is the fact that their spectrum can be confused with other objects, such as planetary ...
K. Iłkiewicz, J. Mikołajewska
semanticscholar +1 more source
IFU spectroscopy of Southern Planetary Nebulae: III [PDF]
, 2016 In this paper we describe integral field spectroscopic observations of four southern Galactic Planetary Nebulae (PNe), M3-4, M3-6, Hen2-29 and Hen2-37 covering the spectral range, 3400-7000 A.
A. Ali +5 more
semanticscholar +1 more source
MULTI-STAGES OPTIMIZED PHOTOIONIZATION MODELLING OF PLANETARY NEBULA LMC SMP-21
Odessa Astronomical Publications, 2012 The new approximation expression for the representation of gas density distribution in planetary nebulae envelopes was proposed. The new multi-stages method for the caclulation of the chemical composition and physical parameters of planetary nebulae ...
B. Ya. Melekh +5 more
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On the Age of Galactic Bulge CSPNe: Too Young and Complicated?
Galaxies, 2020 We present preliminary results of our study of a small sample of planetary nebulae in the Galactic Bulge for which high-angular resolution Hubble Space Telescope imaging is available.
Foteini Lykou +2 more
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PHOTOELECTRIC SPECTROPHOTOMETRY OF PLANETARY NEBULAE. [PDF]
Proc Natl Acad Sci U S A, 1963 Liller W, Aller LH.
europepmc +7 more sources
Planetary Nebulae that Cannot Be Explained by Binary Systems [PDF]
, 2016 We examine the images of hundreds of planetary nebulae (PNe) and find that for about one in six PNe the morphology is too “messy” to be accounted for by models of stellar binary interaction.
Ealeal Bear, N. Soker
semanticscholar +1 more source
Interpretation of the expansion law of planetary nebulae [PDF]
, 2006 We reproduce the expansion velocity--radius ($V_{\rm{exp}}$--$R_{\rm{n}}$) relation in planetary nebulae by considering a simple dynamical model, in order to investigate the dynamical evolution and formation of planetary nebulae.
Fukue, Tsubasa +2 more
core +3 more sources