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Malaroda, S.; Leone, F. (2003). «Elemental abundance studies of CP stars. The helium-weak stars HD 19400, HD 34797 and HD 35456». Astronomy and Astrophysics…16 kB (1595 palabras) - 18:36 25 mar 2024
Resultados de la Wikipedia en inglés.
- Stellar population (redirección desde Ultra metal-poor star)heavier than helium to be a "metal", including chemical non-metals such as oxygen. Observation of stellar spectra has revealed that stars older than the…35 kB (3540 palabras) - 16:36 11 jun 2024
- Metallicity (redirección desde Metal-poor)and helium". This word-use is distinct from the conventional chemical or physical definition of a metal as an electrically conducting solid. Stars and…38 kB (4441 palabras) - 02:12 25 abr 2024
- Red giant (redirección desde Red-giant branch stars)hydrogen into helium in a shell surrounding an inert helium core red-clump stars in the cool half of the horizontal branch, fusing helium into carbon in…26 kB (3355 palabras) - 01:07 23 may 2024
- Horizontal branch (redirección desde Horizontal branch stars)follows the red-giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha…14 kB (1722 palabras) - 16:03 7 sep 2023
- Red-giant branch (redirección desde Red giant branch stars)before helium ignition occurs in the course of stellar evolution. It is a stage that follows the main sequence for low- to intermediate-mass stars. Red-giant-branch…32 kB (3933 palabras) - 15:04 20 nov 2023
- Main sequence (redirección desde Main sequence stars)As an example, there are metal-poor stars (with a very low abundance of elements with higher atomic numbers than helium) that lie just below the main sequence…60 kB (6813 palabras) - 07:50 7 abr 2024
- Carbon star (redirección desde Type-C stars)the non-classical carbon stars is not known. Other less convincing theories, such as CNO cycle unbalancing and core helium flash have also been proposed…24 kB (2252 palabras) - 20:13 6 jun 2024
- Wolf–Rayet star (redirección desde Wolf-Rayet stars)population I) Wolf–Rayet stars are evolved, massive stars that have completely lost their outer hydrogen and are fusing helium or heavier elements in the…96 kB (10 597 palabras) - 18:35 10 jun 2024
- The helium hydride ion, hydridohelium(1+) ion, or helonium is a cation (positively charged ion) with chemical formula HeH+. It consists of a helium atom…29 kB (2964 palabras) - 19:46 12 may 2024
- Stellar classification (redirección desde Early-type stars)large-grained clouds. Carbon-stars are stars whose spectra indicate production of carbon – a byproduct of triple-alpha helium fusion. With increased carbon…104 kB (11 345 palabras) - 19:53 6 jun 2024
- Cepheid variable (redirección desde Cepheid variable stars)usual symbol for the gas opacity. Helium is the gas thought to be most active in the process. Doubly ionized helium (helium whose atoms are missing both electrons)…37 kB (4170 palabras) - 19:48 20 abr 2024
- Sun (categoría G-type main-sequence stars)molecular cloud that consisted mostly of hydrogen and helium and that probably gave birth to many other stars. This age is estimated using computer models of…171 kB (18 872 palabras) - 12:26 10 jun 2024
- abundance of lithium as inferred from observations of metal-poor (Population II) halo stars in our galaxy and the amount that should theoretically exist…26 kB (2488 palabras) - 13:11 5 ene 2024
- Red dwarf (redirección desde Red dwarf stars)product of nuclear fusion of hydrogen into helium by way of the proton–proton (PP) chain mechanism. Hence, these stars emit relatively little light, sometimes…36 kB (4242 palabras) - 23:08 31 may 2024
- Nuclear fusion (sección In stars)elements in stars releases energy and the mass that always accompanies it. For example, in the fusion of two hydrogen nuclei to form helium, 0.645% of…96 kB (10 358 palabras) - 22:11 7 jun 2024
- 100,000 K. Ionized helium is prominent in their spectra. Gravity acceleration is expressed by log g between 4.0 and 6.5. Many sdO stars are moving at high…5 kB (564 palabras) - 00:10 30 may 2024
- some metal-poor globular clusters. Stars with a similar mass to the sun evolve towards the tip of the red-giant branch with a degenerate helium core. More…13 kB (1664 palabras) - 05:02 10 jun 2024
- AM Canum Venaticorum star (redirección desde AM CVn stars)sizes of the two component stars. AM CVn systems consist of an accretor white dwarf star, a donor star consisting mostly of helium, and usually an accretion…15 kB (2062 palabras) - 02:16 24 ene 2024
- Thermal runaway (categoría Cataclysmic variable stars)response is inhibited. When stars in the 0.8–2.0 solar mass range exhaust the hydrogen in their cores and become red giants, the helium accumulating in their…35 kB (4163 palabras) - 07:13 7 feb 2024
- (no elements except hydrogen and helium). The larger stars have very short lifetimes compared to most Main Sequence stars we see today, so they commonly…137 kB (13 914 palabras) - 18:00 7 jun 2024
- show that its stars are "metal-poor" – they contain hydrogen and helium but little else. Djorgovski 1 is actually one of the most metal-poor clusters in…2 kB (149 palabras) - 19:44 18 mar 2024