Results 31 to 40 of about 3,080,831 (379)
CARBON NEUTRON STAR ATMOSPHERES [PDF]
The Astrophysical Journal Supplement Series, 2013 The accuracy of measuring the basic parameters of neutron stars is limited in particular by uncertainties in chemical composition of their atmospheres. For example, atmospheres of thermally - emitting neutron stars in supernova remnants might have exotic chemical compositions, and for one of them, the neutron star in CasA, a pure carbon atmosphere has ...
Klaus Werner +4 more
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The Binary Dwarf Carbon Star SDSS J125017.90+252427.6 [PDF]
, 2018 Although dwarf carbon (dC) stars are universally thought to be binaries in order to explain the presence of C2 in their spectra while still near main-sequence luminosity, direct observational evidence for their binarity is remarkably scarce.
B. Margon +5 more
semanticscholar +1 more source
Energies, 2021 Since existing residential buildings are a significant global contributor to energy consumption and greenhouse gas (GHG) emissions, any serious effort to reduce the actual energy and carbon emissions of the building sector should explicitly address the ...
Seongwon Seo, Greg Foliente
doaj +1 more source
HIGH-RESOLUTION CO OBSERVATION OF THE CARBON STAR CIT 6 REVEALING THE SPIRAL STRUCTURE AND A NASCENT BIPOLAR OUTFLOW [PDF]
, 2015 CIT 6 is a carbon star in the transitional phase from the asymptotic giant branch (AGB) to the protoplanetary nebulae (pPNs). Observational evidences of two point sources in the optical, circumstellar arc segments in an HC3N line emission, and a bipolar ...
Hyosun Kim +10 more
semanticscholar +1 more source
Interpretation of Carbon Stars [PDF]
Symposium - International Astronomical Union, 1974 This communication aims at presenting the results of a research, whose purposes are to gain some insight into the evolutionary state of C stars, when the assumption is made that the main features of their spectra are due to mixing of the envelope with thermonuclear processed layers.
N. Dallaporta, C. Barbaro
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Discovery of a shell of neutral atomic hydrogen surrounding the carbon star IRC+10216 [PDF]
, 2015 We have used the Robert C. Byrd Green Bank Telescope to perform the most sensitive search to date for neutral atomic hydrogen (HI) in the circumstellar envelope (CSE) of the carbon star IRC+10216.
L. Matthews, É. Gérard, T. Bertre
semanticscholar +1 more source
Evidence of First Stars-enriched Gas in High-redshift Absorbers
The Astrophysical Journal, 2023 The first stars were born from chemically pristine gas. They were likely massive, and thus they rapidly exploded as supernovae, enriching the surrounding gas with the first heavy elements.
Andrea Saccardi +8 more
doaj +1 more source
Are there carbon stars in the Bulge? [PDF]
Symposium - International Astronomical Union, 1999 The Bulge carbon stars have been a mystery since their discovery by Azzopardi et al. (1991), because they are about too faint to be regarded as genuine AGB stars, if located inside the metal-rich Bulge . Part of the mystery can be solved if these carbon stars are related to the Sagittarius dwarf galaxy .
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The chemistry of extragalactic carbon stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 Accepted for publication in the Monthly Notices of the Royal Astronomical Society (MNRAS)
Martin A. Cordiner +4 more
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Nuclear Physics A, 2005 The triple alpha process plays an important role in the production of 12C in stars. Its rate is known with an accuracy of about 12%. We examine the corresponding uncertainties introduced in the description of pre-supernova stars, of nucleosynthesis in a core-collapse SN explosion, and of the production of 12C during the third dredge-up in asymptotic ...
openaire +2 more sources