- technetium stars
- estrellas de tecnecio
English-Spanish dictionary of astronomy terms. 2014.
technetium stars
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Technetium — molybdenum ← technetium → ruthenium Mn ↑ Tc ↓ Re … Wikipedia
technetium — Symbol: Tc Atomic number: 43 Atomic weight: (98) Radioactive metallic transition element. Can be detected in some stars and the fission products of uranium. First made by Perrier and Segre by bombarding molybdenum with deutrons, giving them Tc 97 … Elements of periodic system
Technetium — Eigenschaften … Deutsch Wikipedia
technetium — /tek nee shee euhm, sheuhm/, n. Chem. an element of the manganese family, not found in nature, but obtained in the fission of uranium or by the bombardment of molybdenum. Symbol: Tc; at. wt.: 99; at. no.: 43; sp. gr.: 11.5. [1945 50; < Gk… … Universalium
Étoile à technétium — Une étoile à technétium est une étoile dont le spectre contient des raies d absorption du technétium. L isotope le plus stable de cet élément chimique étant le 98Tc avec une période radioactive de 4,2 millions d années, trop brève pour… … Wikipédia en Français
List of most massive stars — This is a list of the most massive stars so far discovered. The list is ordered by solar mass (1 solar mass = the mass of Earth s Sun). Stellar mass is the most important attribute of a star. Combined with chemical compositions, mass determines a … Wikipedia
List of nearest stars — Artist s conception of a red dwarf star, the most common type of star in the Sun s stellar neighborhood, and in the universe. Although termed a red dwarf, the surface temperature of this star would give it an orange hue when viewed from close… … Wikipedia
List of most luminous stars — Below is a list of stars arranged in order of decreasing luminosity (increasing bolometric magnitude). Accurate measurement of stellar luminosities is quite difficult in practice, even when the apparent magnitude is measured accurately, for three … Wikipedia
List of proper names of stars — This is a list of proper names for stars, mostly derived from Arabic and Latin. See also the list of stars by constellation, which gives variant names, derivations, and magnitudes. Of the roughly 10,000 stars visible to the naked eye, only few… … Wikipedia
Carbon star — A carbon star is a late type star similar to a red giant (or occasionally to a red dwarf) whose atmosphere contains more carbon than oxygen; the two elements combine in the upper layers of the star, forming carbon monoxide, which consumes all the … Wikipedia
Технециевая звезда — Технециевая звезда звезда, в спектре которой присутствуют линии поглощения технеция Tc I (423,8 и 426,2 нм). Впервые такие звёзды были обнаружены Мериллом в 1952 году. Технециевые звёзды принадлежат к спектральным классам M, MS, S, SC, CN.… … Википедия
