Examples of using Main-sequence in English and their translations into Vietnamese
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Relative size of O-type stars with other main-sequence stars.
Sirius A, an A-type main-sequence star, is the larger of the two.
Methane absorption is not expected at the temperatures of main-sequence stars.
Stars of this mass have main-sequence lifetimes many times longer than the current age of the Universe.[1].
Part of the constellation of Carina,Epsilon Carinae is an example of a double star featuring a main-sequence B-type star.
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A G-type main-sequence star will fuse hydrogen for approximately 10 billion years, until it is exhausted at the center of the star.
The energy source of PMS objects is gravitational contraction,as opposed to hydrogen burning in main-sequence stars.
The victim proplydswill then probably go on to become main-sequence stars or brown dwarfs of the L and T classes, which are quite invisible to us.
Like other main-sequence stars, a G-type main-sequence star is converting the element hydrogen to helium in its core by means of nuclear fusion.
A giant star is a star with substantially larger radius andluminosity than a main-sequence(or dwarf) star of the same surface temperature.
It is a K-type main-sequence star with an apparent magnitude of 10.250.[1] It is 97 light-years(30 parsecs) away, based on parallax.[2].
It is composed of two sun like stars in a eclipsing binary with a 2.5-day period,which is in turn orbited by a A-type main-sequence star with a 185-year orbital period.
Kepler-37, also known as UGA-1785,[5][6][7] is a G-type main-sequence star located in the constellation Lyra 209 light years from Earth.
Most O-type main-sequence stars will evolve more or less horizontally in the HR diagram to cooler temperatures, becoming blue supergiants.
In stellar evolution, an FU Orionis star(also FU Orionis object, or FUor)is a pre- main-sequence star which displays an extreme change in magnitude and spectral type.
Luminosity class V, main-sequence stars, generally have weak or missing emission lines, with giants and supergiants showing increasing emission line strength.
The spectrum of Delta Aquarii matches a stellar classification of A3 Vp,indicating this is a chemically peculiar A-type main-sequence star that is generating energy through the nuclear fusion of hydrogen at its core.
Orange dwarfs are K-type main-sequence stars. A blue dwarf is a hypothesized class of very-low-mass stars that increase in temperature as they near the end of their main-sequence lifetime.
Epsilon Indi(ε Indi, ε Ind) is a star system approximately 12 light-years fromEarth in the constellation of Indus consisting of a K-type main-sequence star, ε Indi A, and two brown dwarfs, ε Indi Ba and ε Indi Bb, in a wide orbit around it.
It is a main-sequence star of spectral class K2, which means that energy generated at the core through nuclear fusion of hydrogen is emitted from the surface at a temperature of about 5,000 K, giving it an orange hue.
These stars are doubly rare because they are very massive,initially hot class O-type main-sequence stars more than 15 times as massive as the Sun, but also because they spend only a few thousand years in the unstable yellow void phase of their lives.
The class was originally recognized and defined by William P. Bidelman and Philip Keenan.[1] Initially, after their discovery, they were thought to be red giants,but the same chemical signature has been observed in main-sequence stars[2][3] as well.
Brown dwarf Hertzsprung- Russell diagram K-type main-sequence star Red dwarf Solar twin Star count, survey of stars Stellar classification, class G.
At its estimated distance, this yields a physical size of about 36 times the radius of the Sun.[3] It is radiating 603[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,210 K.[5]The companion is most likely an A-type main-sequence star with a class of A8- 9 V.[6].
A B-type main-sequence star(B V) is a main-sequence(hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K.[2] B-type stars are extremely luminous and blue.
While the spectral lines strongly indicate that the star is of spectral type F2V-IV, previous analyses have stated that the star is a G8III giant star andan F0V main-sequence star.[3] Located in the constellation Cetus, the star has a metallicity only 1% that of the Sun.
KIC 8462852 is an F-type main-sequence star exhibiting unusual light fluctuations, including up to a 22% dimming in brightness.[11] Several hypotheses have been proposed to explain these irregular changes, but none to date fully explain all aspects of the curve.
More massive(gt;8 M☉) stars in pre-main-sequence stage are not observed, because they evolve very quickly: when they become visible(i.e. disperses surrounding circumstellar gas and dust cloud),the hydrogen in the center is already burning and they are main-sequence objects.
Older studies had it classed as an A-type main-sequence star with a class of A7 V.[2] At the age of 307[3] million years, it has a high rate of spin, revolving upon its axis once every 1.278 days.[4] It is a Delta Scuti variable[5] with 1.75[7] times the mass of the Sun and 2.2[8] times the Sun's radius.
It is a G-type main-sequence star, like the Sun, and it is located about 3,680 light-years(1130 parsecs) away.[1] It is fairly similar to the Sun, with 115% of its mass, a radius of 129% times that of the Sun, and a surface temperature of 5,750 K.[2] There is one known extrasolar planet orbiting Kepler-41.[3].