Results 111 to 120 of about 191,657 (282)
VIS‐to‐MIR reflectance and Raman spectroscopy of the CM2 NWA 12184 carbonaceous chondrite
Meteoritics &Planetary Science, Volume 60, Issue 3, Page 570-595, March 2025.Abstract The spectral analysis of CM meteorites can help to constrain the mineralogical composition of their parent body, the C‐type asteroids. The CM2 NWA 12184 was spectrally examined employing seven complementary techniques at different spatial resolutions, including VIS‐to‐MIR reflectance and Raman spectroscopy.
A. Galiano +15 more
wiley +1 more source
Molecular Hydrogen Microstructures in Planetary Nebulae
Galaxies, 2020 Molecular hydrogen (H 2 ) emission is commonly detected in planetary nebulae (PNe), specially in objects with bipolar morphologies. New studies showed that H 2 gas is also packed in microstructures embedded in PNe of any morphological type.
Stavros Akras +3 more
doaj +1 more source
Planetary nebulae and how to find them: A concise review
Frontiers in Astronomy and Space Sciences, 2022 This review provides useful background and information on how we find, vet and compile Planetary Nebulae (PNe) candidates and verify them. It presents a summary of the known Galactic PNe population and their curation in the Hong Kong/AAO/Strasbourg/Hα ...
Quentin A. Parker +1 more
doaj +1 more source
Clumps in the Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1993 The effect of density and temperature fluctuations on the intensity of the recombination and collisionally excited lines is investigated.
A. F. Kholtygin, T. Kh. Feklistova
openaire +2 more sources
Spitzer observations of planetary nebulae [PDF]
Proceedings of the International Astronomical Union, 2011 AbstractThe Spitzer Space Telescope has three science instruments (IRAC, MIPS, and IRS) that can take images at 3.6, 4.5, 5.8, 8.0, 24, 70, and 160 μm, spectra over 5–38 μm, and spectral energy distribution over 52–100 μm. The Spitzer archive contains targeted imaging observations for more than 100 PNe.
Chu, You-Hua, Chu, You-Hua
openaire +4 more sources
Chemical abundances in Galactic planetary nebulae with Spitzer spectra [PDF]
, 2014 We present new low-resolution (R ∼ 800) optical spectra of 22 Galactic planetary nebulae (PNe) with Spitzer spectra. These data are combined with recent optical spectroscopic data available in the literature to construct representative samples of compact
D. A. García-Hernández, S. Górny
semanticscholar +1 more source
Irradiation Investigation: Exploring the Molecular Gas in NGC 7293
Galaxies, 2020 Background: Many planetary nebulae retain significant quantities of molecular gas and dust despite their signature hostile radiation environments and energetic shocks.
Jesse Bublitz +7 more
doaj +1 more source
Molecular Envelopes of Planetary Nebulae and Proto-Planetary Nebulae [PDF]
International Astronomical Union Colloquium, 1994 As stars evolve up the asymptotic giant branch (AGB), they begin to lose mass at a high rate, and in the process they create extended circumstellar molecular envelopes. Since the transition from AGB to planetary nebula stages is of the order of 1000 yr, the remnant of such molecular envelopes should still be observable in pro to-planetary nebulae (PPN)
openaire +2 more sources
DUSTY DISKS AROUND CENTRAL STARS OF PLANETARY NEBULAE [PDF]
, 2014 Only a few percent of cool, old white dwarfs (WDs) have infrared excesses interpreted as originating in small hot disks due to the infall and destruction of single asteroids that come within the star's Roche limit.
G. Clayton +6 more
semanticscholar +1 more source
Meteoritics &Planetary Science, Volume 60, Issue 3, Page 616-631, March 2025.Abstract Results of microanalysis study of NWA 869 meteorite, an ordinary chondrite, where silicates, Fe‐Ni alloys, and troilite are major constituents, are reported. The presented study of microtextures in metallic and sulfide grains provides information on processes occurring from the asteroid's accretion, through the impacts until cooling.
Paulina Skirak +4 more
wiley +1 more source