Results 1 to 10 of about 3,080,831 (379)
Witnessing the emergence of a carbon star [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2015 Abstract During the late stages of their evolution, Sun-like stars bring the products of nuclear burning to the surface. Most of the carbon in the Universe is believed to originate from stars with masses up to a few solar masses. Although there is a chemical dichotomy between oxygen-rich and carbon-rich evolved stars, the dredge-up ...
David Jones +13 more
openaire +8 more sources
Evolution of Neutron-Star, Carbon-Oxygen White-Dwarf Binaries [PDF]
, 2000 At least one, but more likely two or more, eccentric neutron-star, carbon-oxygen white-dwarf binaries with an unrecycled pulsar have been observed.
Braun H. +20 more
core +4 more sources
Prefabricated building construction in materialization phase as catalysts for hotel low-carbon transitions via hybrid computational visualization algorithms [PDF]
Scientific ReportsThis study examines the carbon emissions of star-rated hotels in Hangzhou, comparing the environmental impact of prefabricated construction (PC) and conventional construction (CC) methodologies.
Gangwei Cai, Xiaoting Guo, Yuguang Sun
doaj +2 more sources
Carbon star survey in the Local Group. VII. NGC 3109 a galaxy without a stellar halo [PDF]
, 2003 We present a CFH12K wide field survey of the carbon star population in and around NGC 3109. Carbon stars, the brightest members of the intermediate-age population, were found nearly exclusively in and near the disk of NGC 3109, ruling out the existence ...
Albert +29 more
core +2 more sources
High-Resolution Spectroscopy of Cool Carbon-Rich and Metal-Poor Star HD 209621 [PDF]
Open Astronomy, 2012 Element abundances for HD 209621 obtained earlier display significant discrepancies, especially in the case of CNO and neutron-capture elements. Therefore we performed a detailed analysis of chemical composition of this star using a new high-resolution ...
Matrozis E., Začs L., Barzdis A.
doaj +2 more sources
Carbon emission reduction calculation for the green transformation of traditional hotel design
Frontiers in Energy Research, 2022 The green transformation design of traditional hotels aims to reduce the consumption of materials and energy and reduce the emission of harmful substances.
Jing Qiu +4 more
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TU Tau B: The Peculiar “Eclipse” of a Possible Proto-barium Giant
The Astronomical Journal, 2023 TU Tau (=HD 38218 = HIP 27135) is a binary system consisting of a C-N carbon star primary and an A-type secondary. We report on new photometry and spectroscopy which tracked the recent disappearance of the A-star secondary.
Richard O. Gray +28 more
doaj +1 more source
The Carbon Stars Adventure [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractWe compare in a systematic way spectrometric, photometric and mid-infrared (VLTI/MIDI) interferometric measurements with different types of model atmospheres. Self-consistent dynamic model atmospheres in particular were used to interpret in a consistent way the dynamic behavior of gas and dust.
Rau, Gioia +6 more
openaire +3 more sources
On the formation of carbon stars [PDF]
The Astrophysical Journal, 1990 The effect of the mass loss on the formation of carbon stars is investigated using different mass-loss formulas including one proposed in this paper, and the results of different formulas are compared with the observed properties of C stars. It is shown that the new formula reproduces well the observed luminosity distribution of AGB stars, the initial ...
Bryan, GL, Volk, K, Kwok, S
openaire +4 more sources
The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11
The Astrophysical Journal Letters, 2023 We analyze new JWST NIRCam and NIRSpec data on the redshift 9.11 galaxy MACS1149-JD1 (hereafter JD1). Our NIRCam imaging data reveal that JD1 comprises three spatially distinct components. Our spectroscopic data indicate that JD1 appears dust free but is
Massimo Stiavelli +8 more
doaj +1 more source