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Mostrando ítems 1-10 de 26
La abundancia primordial del Hielo
(Facultad de Ciencias, 2010)
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling
(2001-12)
The synthesis of helium in the early Universe depends on many input parameters, including the value of the gravitational coupling during the period when the nucleosynthesis takes place. We compute the primordial abundance ...
La abundancia primordial del Hielo
(Facultad de Ciencias, 2010)
Seven Problems Related to the Determination of the Primordial Helium Abundance
(Perez, E.Gonzalez, R.Granada, 2003)
Seven Problems Related to the Determination of the Primordial Helium AbundanceStar Formation Through Time
(Perez, E.Gonzalez, R.Granada, 2020)
On a New Parameter to Estimate the Helium Content in Old Stellar Systems
(2011)
We introduce a new parameter {\Delta}{\xi} - the difference in magnitude between the red giant branch (RGB) bump and a point on the main sequence (MS) at the same color as the bump, the "benchmark" - to estimate the helium ...
Primordial helium-3 redux : the helium isotope ratio of the Orion nebula
(IOP, 2022)
We report the first direct measurement of the helium isotope ratio, He-3/He-4, outside of the Local Interstellar Cloud, as part of science-verification observations with the upgraded CRyogenic InfraRed Echelle Spectrograph. ...
The helium content of globular clusters: light element abundance correlations and HB morphology. I. NGC 6752
(2009)
Helium has been proposed as the key element to interpret the observed multiple main sequences (MS), subgiant branches (SGB) and red giant branches (RGB), as well as the complex horizontal branch (HB) morphology in Globular ...