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Among the given main sequence stars, the G9 star would be the least luminous. The classification indicates that G-type stars (like G1 and G5) are more luminous than G9 stars, and F-type stars (F0 and F3) are even more luminous than G-type stars. Therefore, as the spectral class moves from G1 to G9, the luminosity decreases, making G9 the least luminous option.
What else can I help you with?
What category of star is hot but not very luminous?
Main sequence
What sequence of stars is listed in order of increasing luminosity?
The sequence of stars listed in order of increasing luminosity typically includes red dwarfs, main-sequence stars (like our Sun), giant stars, and supergiant stars. Red dwarfs are the least luminous, followed by main-sequence stars, then giant stars, and finally supergiants, which are the most luminous. This order reflects the increasing energy output and size of the stars as they evolve.
Which type of star best obey mass-luminosity relation?
Main sequence stars best obey the mass-luminosity relation. This empirical relation states that there is a direct relationship between a star's mass and its luminosity. In general, the more massive a main sequence star is, the more luminous it will be.
What are the letters that follow the spectral sequence OBAFGKM?
The next sequence of letters following OBAFGKM in the spectral classification system are L, T, Y. These letters are used to classify cooler and less luminous stars outside the main sequence, such as brown dwarfs.
What would be the luminosity and color of main sequence star with a temperature of 25000 K?
A main sequence star with a temperature of 25,000 K would have a significantly high luminosity, potentially around 10,000 times that of the Sun, categorizing it as an O-type star. The high temperature would result in a blue color, emitting most of its energy in the ultraviolet and blue parts of the spectrum. Such stars are very hot and luminous, often leading to shorter lifespans due to their rapid hydrogen consumption.
What category of star is hot but not very luminous?
Main sequence
What sequence of stars is listed in order of increasing luminosity?
The sequence of stars listed in order of increasing luminosity typically includes red dwarfs, main-sequence stars (like our Sun), giant stars, and supergiant stars. Red dwarfs are the least luminous, followed by main-sequence stars, then giant stars, and finally supergiants, which are the most luminous. This order reflects the increasing energy output and size of the stars as they evolve.
Are blue stars more luminous?
Blue stars are more luminous than other main sequence stars but not necessarily brighter than giant and supergiant stars.
Which spectral type of star spends the least amount of time on the main sequence?
O, because O stars are the hottest, so they use their energy faster than the lower stars.
Where are most stars plotted on an HR diagram?
Most stars are plotted along the main sequence in the Hertzsprung-Russell (HR) diagram, which extends diagonally from the upper left (hot and luminous stars) to the lower right (cool and less luminous stars). This is because the majority of stars, including our Sun, spend the majority of their lives in the main sequence phase where they are fusing hydrogen into helium.
What 2 types of stars can form from a nebula?
Two types of stars that can form from a nebula are main sequence stars, like our sun, and giant stars, which are larger and more luminous than main sequence stars.
Which main-sequence stars are the least massive?
red
Where a main sequence star is located on the H-R diagram depends on its temperature and its?
The location of a main sequence star on the H-R diagram depends on its temperature and its luminosity (or brightness). Main sequence stars follow a diagonal band on the diagram, with hotter and more luminous stars located towards the top left and cooler and less luminous stars towards the bottom right.
Which type of star best obey mass-luminosity relation?
Main sequence stars best obey the mass-luminosity relation. This empirical relation states that there is a direct relationship between a star's mass and its luminosity. In general, the more massive a main sequence star is, the more luminous it will be.
Is our sun the most or least massive of main sequence stars?
Neither, the sun is on the small side of the middle range of main sequence stars.
What happens to the magnitude of a star in the main sequence as its temperature decreases?
The cooler a star is, the less luminous it is. That's assuming the star stays about the same size. "Red giant" stars for example are relatively cool, but very luminous because of their size. However, red giants are not main sequence stars. For a main sequence star, a lower temperature means it is LESS bright. That means it has a higher number on the "magnitude" scale. So the answer is: "the magnitude increases" Our Sun is putting out more energy than it did a billion years ago. It is expected to get even hotter before it leaves the main sequence and becomes a red giant.
What are stars like near the top of the bottom main sequence the middle and the bottom?
Stars at the top of the main sequence, like O and B types, are massive, hot, and very luminous, often exhibiting strong stellar winds. Those in the middle, such as A and F types, have moderate temperatures and luminosities, with stable hydrogen fusion in their cores. At the bottom of the main sequence, K and M type stars are cooler, smaller, and less luminous, often burning hydrogen slowly and having longer lifespans. The characteristics of these stars reflect their mass, temperature, and evolutionary stage within the main sequence.
