Results 11 to 20 of about 307,539 (195)

A Sr-Rich Star on the Main Sequence of Omega Centauri [PDF]

open access: yes, 2006
Abundance ratios relative to iron for carbon, nitrogen, strontium and barium are presented for a metal-rich main sequence star ([Fe/H]=--0.74) in the globular cluster omega Centauri. This star, designated 2015448, shows depleted carbon and solar nitrogen,
Asplund M.   +7 more
core   +3 more sources

CD -24_17504 revisited: a new comprehensive element abundance analysis [PDF]

open access: yes, 2015
With [Fe/H] ~ -3.3, CD -24_17504 is a canonical metal-poor main sequence turn-off star. Though it has appeared in numerous literature studies, the most comprehensive abundance analysis for the star based on high resolution, high signal-to-noise spectra ...
Frebel, Anna, Jacobson, Heather R.
core   +2 more sources

Anisotropic charge trapping in phototransistors unlocks ultrasensitive polarimetry for bionic navigation

open access: yesNature Communications, 2022
The direct linear dichroism photodetection without external optics is crucial for applications. Here, Jie et al. exploit the anisotropic charge trapping in organic phototransistors to achieve the dichroic ratio of 104 and to demonstrate a polarizer-free ...
Jing Pan   +8 more
doaj   +1 more source

Evolution of Neutron-Star, Carbon-Oxygen White-Dwarf Binaries [PDF]

open access: yes, 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   +2 more sources

Research of low-carbon transition path of star hotels--A case study of Guilin

open access: yesSHS Web of Conferences, 2016
A general trend of the world economic development is the low-carbon economic transition. With a wide influencing range and rapid development, the hotel industry has prominent problems in the energy con-sumption, resources occupancy and environmental ...
Tang Fengling
doaj   +1 more source

Thermal design and analysis of high power star sensors

open access: yesCase Studies in Thermal Engineering, 2015
The requirement for the temperature stability is very high in the star sensors as the high precision needs for the altitude information. Thermal design and analysis thus is important for the high power star sensors and their supporters.
Fan Jiang   +4 more
doaj   +1 more source

SDSS J142625.71+575218.3: A Prototype for A New Class of Variable White Dwarf [PDF]

open access: yes, 2008
We present the results of a search for pulsations in six of the recently discovered carbon-atmosphere white dwarf ("hot DQ") stars. On the basis of our theoretical calculations, the star SDSS J142625.71 + 575218.3 is the only object expected to pulsate ...
DeGennaro, Steven   +5 more
core   +1 more source

The influence of initial orbital period on helium and carbon-oxygen core masses in massive case a binary systems with low accretion efficiency [PDF]

open access: yesSerbian Astronomical Journal, 2022
The evolutionary models of 33 massive Case A binary systems in mass range from 30M⊙ to 40M⊙ with initial orbital periods of 3, 4 and 5 days, accretion efficiency of 10% and at the solar metallicity are presented. The models are obtained with the
Petrović Jelena
doaj   +1 more source

Discovery of a hyperalkaline liquid condensed phase: significance toward applications in carbon dioxide sequestration

open access: yesFrontiers in Bioengineering and Biotechnology
Bicarbonate ion-containing solutions such as seawater, natural brines, bovine serum and other mineralizing fluids have been found to contain hyperalkaline droplets of a separate, liquid condensed phase (LCP), that have higher concentrations of ...
Mark A. Bewernitz   +6 more
doaj   +1 more source

Tracing the origin of neutron-capture elements in the metalpoor star HE 1244-3036 [PDF]

open access: yesEPJ Web of Conferences
We present results from a detailed abundance analysis of a star HE 1244-3036, based on a high resolution (R ∼ 50000) SUBARU/HDS spectrum. The wavelength coverage is from 3510 to 5310 Å. Our estimated metallicity [Fe/H] ∼ −2.5 and carbon abundance ([C/Fe]
Dutta Debasish, Goswami Aruna
doaj   +1 more source

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