Results 151 to 160 of about 191,657 (282)
Rapid Communications in Mass Spectrometry, Volume 39, Issue 13, 15 July 2025.ABSTRACT Rationale Matrix effects by secondary ion mass spectrometry (SIMS) are empirically corrected by calibration using matrix‐matched reference materials. However, conventional parametric regression cannot estimate the prediction uncertainty to account for the difference in compositions of new data and reference materials. Applying Gaussian process
Keita Itano +5 more
wiley +1 more source
Whither or Wither the Sulfur Anomaly in Planetary Nebulae?
The Astrophysical Journal LettersWe present a thorough investigation of the long-standing sulfur anomaly enigma. Our analysis uses chemical abundances from the most extensive data set available for 126 planetary nebulae (PNs) with improved accuracy and reduced uncertainties from a 10° ×
Shuyu Tan, Quentin A. Parker
doaj +1 more source
New Close Binary Central Stars of Planetary Nebulae from Gaia DR3 Epoch Photometry. [PDF]
Res Notes AAS, 2022 Chornay N, Walton NA.
europepmc +1 more source
Symposium - International Astronomical Union, 1993 As a complement to the “Strasbourg–ESO Catalogue of Galactic Planetary Nebulae” (Acker et al. 1992), we give the list of newly discovered planetary nebulae.
openaire +2 more sources
Testing the binary hypothesis for the formation and shaping of planetary nebulae
, 2012 There is no quantitative theory to explain why a high 80% of all planetary nebulae are non-spherical. The Binary Hypothesis states that a companion to the progenitor of a central star of planetary nebula is required to shape the nebula and even for a ...
Bojicic, I. +7 more
core
A survey for PAH emission in H II regions, planetary and proto-planetary nebulae [PDF]
The results of a systematic investigation of polycyclic aromatic hydrocarbon (PAH) emission in H II regions, planetary nebulae (PN), and proto-planetary nebulae (PNN), are reported. Data is obtained from the low resolution spectra (LRS) of IRAS.
Cox, P., Demuizon, M., Lequeux, J.
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Catalogues of Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1989 Firstly, the general requirements concerning catalogues are studied for planetary nebulae, in particular concerning the objects to be included in a catalogue of PN, their denominations, followed by reflexions about the afterlife and computerized versions of a catalogue.
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MILAN Sky Survey, a dataset of raw deep sky images captured during one year with a Stellina automated telescope. [PDF]
Data Brief, 2023 Parisot O +5 more
europepmc +1 more source
Origin of Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1967 My interest in the origin of planetary nebulae goes back to 1967 when I proposed that the envelopes of giants with degenerate carbon-helium cores were dynamically unstable and would be completely ejected to form a planetary nebula. Essentially the same proposal was made almost simultaneously by Lucy (1967) and Paczyński (1967).
openaire +3 more sources
The Astronomical JournalSpectroscopic observations of various tracers in nearby galaxies, such as Andromeda (M31), play a crucial role in identifying and classifying individual stellar populations and nebular objects, thereby enhancing our understanding of galactic composition,
Pinjian Chen +7 more
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