| 词汇 | example_english_red-giant |
| 释义 | Examples of red giantThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. First, when stars of at least 0.4 solar masses exhaust their supply of hydrogen, their outer layers expand to form a redgiant. Evolution towards the redgiant branch for the first time is very rapid while stars can spend much longer on the horizontal branch. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most stars retain more of their hydrogen after the first redgiant phase, and eventually become asymptotic giant branch stars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is the first ionized nebula to be have been discovered around a redgiant star. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Serpentis, a cool redgiant that pulsates between magnitudes 5.89 and 7.07 in 87 days. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Although many of those sources are expanding dust envelopes around redgiant stars, a few are found to be associated with solar-type stars. Sun-like stars will enter the redgiant branch as subgiants. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Once a star has evolved sufficiently to become a redgiant, its circumstellar habitable zone will change dramatically from its main-sequence size. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The star, which is estimated to be at least nine billion years old, has passed the redgiant phase. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In another few million years it will likely cease hydrogen fusion, expand, and brighten as it becomes a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. On an inspiration, they scan "inside" the redgiant star, and discover a truly ancient rocky world which the star had enveloped in its expansion. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The star is now approaching the end of its life, and has expanded its outer envelope to become a redgiant star. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The s-process is a slow neutron capture of lighter elements inside pulsating redgiant stars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This type of low-mass star has consumed the hydrogen at its core, evolved away from the main sequence, and passed through the redgiant stage. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is believed that the surface of the star oscillates slightly, a common feature of redgiant stars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is now in the process of cooling and expanding to become a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Of these, 7 have been found to be in the redgiant stage of their life. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This strong temperature dependence has consequences for the late stage of stellar evolution, the redgiant stage. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The overall luminosity of the star decreases, its outer envelope contracts again, and the star moves from the redgiant branch to the horizontal branch. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The closest redgiant, where all the real dragons are. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The star is estimated to be a 6-billion-year-old redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The envelope of a redgiant can grow to significant dimensions, extending up to a hundred times its previous radius (or larger). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The transfer of mass between the pair occurs either by gravitational streaming or as stellar wind from the redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The star becomes a redgiant whose radius and luminosity increase in time. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Because of the high temperature, unusual nuclear processes may take place as the envelope of the redgiant falls onto the neutron star's surface. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A faint companion is in orbit around the redgiant star, although it is not visible to the naked eye. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Eventually the outer layers of the star will expand and cool and the star will become a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The companion may be a main sequence star, or one that is aging and expanding into a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In a few million years, as the primary evolves toward a redgiant, significant amounts of mass transfer to the secondary component is expected. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It consists of more than 50 stars in a 10 arc minutes field, the brightest of which is a redgiant of mag 6.5. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is now theoretically confirmed thanks to elaborate redgiant modeling. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Enormous numbers of neutrinos are produced in the core of a redgiant star as it collapses on itself. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This star is a subgiant that has begun the process of evolving from a main sequence star into a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Only the redgiant hypothesis has supporting evidence from observations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The redgiant is estimated to have started its life with about 7-8 solar masses. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is a redgiant and is a semi-regular pulsating star. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In a redgiant of up to 2.25 solar masses, hydrogen fusion proceeds in a shell surrounding the core. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Its inner end is well above the plane of the local ecliptic and its outer end appears inside the photosphere of a redgiant star. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The stellar limb of a redgiant is not sharply-defined, contrary to their depiction in many illustrations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Kappa is thought to be just entering its redgiant phase, having exhausted the supply of hydrogen in its core. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During this stage, the redgiant star begins to slowly expel its outermost layers of material. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The galaxy has a well-defined and easily observed redgiant branch, which makes measuring its distance relatively easy. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The supposed small galaxy contains a relatively high percentage of redgiant stars, and is thought to contain an estimated one billion stars in all. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The resulting redgiant enjoys a brief life span, before the helium fuel is in turn consumed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is an ageing star, thought be well on its way transitioning from a redgiant to a planetary nebula. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The fusing hydrogen in its core is coming to an end and it is in the process of expanding as a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. About half a billion years ago, the newly captured star began to expand into a redgiant (see stellar evolution). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Both planets may have accreted additional mass when the primary star lost material during its redgiant phase. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When one of the two stars evolved into a redgiant, it engulfed its companion, which stripped away a ring of material from the larger stars atmosphere. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, this type of massive star eventually evolves into a cooler redgiant which rotates more slowly and thus can be measured using the radial velocity method. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During the expansion, the redgiant star engulfed the neutron star, resulting in both the ejection of the giant's atmosphere and rapid tightening of the neutron star's orbit. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It has evolved off of the main sequence to become a redgiant star, but is most likely on the redgiant branch rather than the asymptotic giant branch. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These stars represent a late stage in the evolution of some stars, caused when a redgiant star loses its outer hydrogen layers before the core begins to fuse helium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During this so-called redgiant stage, the outer layers expand and cool, causing the star's radiation output to move towards the red end of the electromagnetic spectrum. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The astronomers observing the star found that it is nearing the main sequence turn-off (the star fuses the last of its hydrogen and becomes a redgiant). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Kepler-40 is nearing the main sequence turn-off; in other words, it is about to fuse the last of its hydrogen and become a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Appearing to have moved off the main sequence as their core hydrogen supply is being or has been exhausted, they are enlarging and cooling to eventually become redgiant stars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This will cause the outer layers of the star to expand greatly, and the star will enter a phase of its life in which it is called a redgiant. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Finally, in asymptotic giant branch (a type of redgiant) stars, fusion reactions occur in pulses and convection could lift fluorine out of the inner star. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Another possibility is that the star exploded into a disk of material formed when material was shed from the equator of the pre-supernova redgiant star. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These are red giants, near the end of their lives, in which there is an excess of carbon in the atmosphere. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These are stars that are similar mass as the sun, only older, after they have become red giants, just prior to becoming planetary nebulae. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Red giants all have inert cores with hydrogen-burning shells: concentric layers atop the core that are still fusing hydrogen into helium. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The coolest red giants have complex spectra, with molecular lines, masers, and sometimes emission. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Intermediate mass stars will continue to expand and cool until they become red giants. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These include red giants and supergiants, and asymptotic giant branch stars. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Such asymmetries have been observed in winds from lower mass red giants that form planetary nebulas. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Stars with a mass up to 810 solar masses evolve into red giants and slowly lose their outer layers during pulsations in their atmospheres. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Red giants are common in globular clusters and elliptical galaxies. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When the red giants core was exposed, a fast stellar wind inflated two bubbles from either side of the ring. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. For example, consider red giants which produce much of the carbon in our galaxy. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. One possible explanation was that younger galaxies contain more red giants than older galaxies. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The final stage of a red giant's life will also result in prodigious mass loss as the star loses its outer layers to form a planetary nebula. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They are much rarer than red giants, because they only develop from more massive and less common stars, and because they have short lives in the blue giant stage. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These stars are often observed as a red clump of stars in the colour-magnitude diagram of a cluster, hotter and less luminous than the red giants. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Stars that become red giants expand into or overheat the habitable zones of their youth and middle age (though theoretically planets at a much greater distance may become habitable). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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