what two characteristics of a star determine its luminosity
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- Luminosity is the amount of light that a star radiates. The size of the star and its surface temperature determine its luminosity. Apparent magnitude of a star is its perceived brightness, factoring in size and distance, while absolute magnitude is its true brightness irrespective of its distance from earth.
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Star The luminosity of a star is the amount of light and other forms of radiant energy it radiates per unit of time. It has units of power. The luminosity of a star is determined by its radius and surface temperature. Many stars do not radiate uniformly across their entire surface.
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- Measure the brightness of the galaxy. Subtract out light from non-stellar sources. Divide the brightness by the average brightness of a star (most stars are < 1 solar mass - the stellar mass function peaks around 0.5 solar masses I believe - from that you can calculate the luminosity of a .5 solar mass star). This gives you the number of stars.
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Difference Between Brightness and Luminosity Brightness vs Luminosity. Brightness and luminosity are two very important concepts of light and radiation. There are tremendous amounts of applications of brightness and luminosity in fields such as astronomy, physics, astrophysics, cosmology, agriculture, meteorology and even photography. It is vital to have a good understanding in the concepts of brightness and luminosity in order to excel in such fields.
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Spectral Classes This is the temperature of a black body having the same size and luminosity as the star and is determined by Stefan's Law. The variations in spectral lines for different stars are due primarily to the difference in temperature of the outer layers of gas in the star.
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5 EASY DIY Detox Bath Recipes Instructions. 1  Combine 1-part Epsom salt to a 2-part baking soda – mixture creates this basic detox bath for one 30 minute soak. 2  Add mixture while drawing hot bath water, filling the tub 2/3 of the way full. 3  Soak for at least one half hour. For a first detox bath, measure 1 cup of Epsom salt and 2 cups of baking soda. 2  Add mixture while drawing hot bath water, filling the tub 2/3 of the way full. 3  Soak for at least one half hour.
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- Even the largest red dwarfs (for example HD 179930, HIP 12961 and Lacaille 8760) have only about 10% of the Sun's luminosity. In general, red dwarfs less than 0.35 M ☉ transport energy from the core to the surface by convection.ed dwarfs are by far the most common type of star in the Milky Way, at least in the neighborhood of the Sun, but because of their low luminosity, individual red dwarfs cannot easily be observed. From Earth, not one is visible to the naked eye.
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Cepheid Variable Stars & Distance Determination Some types of pulsating variable stars such as Cepheids exhibit a definite relationship between their period and their intrinsic luminosity. Such period-luminosity relationships are invaluable to astronomers as they are a vital method in calculating distances within and beyond our galaxy.
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It has the greatest apparent brightness of any star G 38) How is the lifetime of a star related to its mass? More massive stars live much shorter lives than less massive stars. 39) What is the common trait of all main sequence stars? They generate energy through hydrogen fusion in their core 40) What is a white dwarf? the remains of a star that ran out of fuel for nuclear fusion 41) Carbon fusion occur in high-mass stars but not in low-mass stars because _____.
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Why are pulsating variable stars useful for finding distances to globular clusters? Answers. Best Answer: Cepheid variables are a class of bright, variable stars, with the property that the period of the variation is related to their absolute luminosity. So they can be used to determine the distance, by comparing the measured apparent luminosity, with the absolute luminosity as deduced from the period.est Answer: Cepheid variables are a class of bright, variable stars, with the property that the period of the variation is related to their absolute luminosity.
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Alpha Centauri Alpha Centauri B is the companion star, or secondary, of the binary system, and is slightly smaller and less luminous than the Sun. It is a main-sequence star of spectral type K1 V, making it more an orange color than the primary star.Alpha Centauri B is about 90% the mass of the Sun and 14% smaller in radius.lpha Centauri C, also known as Proxima Centauri, is of spectral class M6 Ve, a small main-sequence star (Type V) with emission lines. Its B−V color index is +1.82 and its mass is about 0.123 solar masses (M☉), or 129 Jupiter masses.
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Main sequence 1 A star can be luminous because it is hot or it is large, or both. 2  The luminosity of a star is its total energy output into all space over all wavelengths. 3  The star's luminosity is related to its mass. 4  The more massive a star is, the more luminous it will be.
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- 4. What factor affects the luminosity of a star? 5. List the color of the stars from hottest to coldest: 6. Most of the stars on the HR Diagram are classified as which type of star? 7. How is it possible for white dwarf stars to have lower luminosity than the sun even though the sun is cooler than white dwarfs? 8. What type of star has a high temperature but a low luminosity? 9. What type of star has a high temperature and a high luminosity? 10. What type of star has a low temperature but a high luminosity? 11.
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General Astronomy/Print version Luminosity is the total amount of light emitted by a particular star. It is the star's intrinsic brightness, or the amount of energy it emits each second. In many cases, this energy comes from thermonuclear reactions inside the star.ote that we have referred to the surface temperatures of stars thus far. Each star, however, ranges in interior temperature with cores reaching temperatures in the millions of degrees. Although the Sun's surface is only 5800°C, for example, its core achieves a temperature of 15 million Celsius.
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chapter 14 16. The difference in brightness between two stars is related to theA.amount of light and energy produced by the stars.B.relative size of the stars.C.distance to the stars. D. All of the above
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- Original conversation. User: The color of a star is primarily determined by its _____. composition size apparent brightness age surface temperatureWeegy: The amount of energy contained in one photon is determined by its ... color: The ___ of a star tells us its surface ...[ measuring its apparent brightness, ...he color of a star is primarily determined by its _____. composition size apparent brightness age surface temperature. The color of a star is primarily determined by its TEMPERATURE.
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Star Giant stars have a much lower surface gravity than do main sequence stars, while the opposite is the case for degenerate, compact stars such as white dwarfs. The surface gravity can influence the appearance of a star's spectrum, with higher gravity causing a broadening of the absorption lines. Rotation
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Luminosity and Apparent Brightness Stars have a wide range of apparent brightness measured here on Earth. The variation in their brightness is caused by both variations in their luminosity and variations in their distance. An intrinsically faint, nearby star can appear to be just as bright to us on Earth as an intrinsically luminous, distant star.
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Beta Volantis In astronomy, luminosity is the total amount of energy emitted by a star, galaxy, or other astronomical object per unit time. It is related to the brightness, which is the luminosity of an object in a given spectral region. In SI units luminosity is measured in joules per second or watts. Values for luminosity are often given in the terms of the luminosity of the Sun, which has a total power output of 7026384600000000000♠3.846×1026 W. The symbol for solar luminosity is L⊙. Luminosity can also be given in terms of magnitude.
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- The difference in the brightness of two stars with the same surface temperature is attributable to their ___ (a. densities (b. colors (c. ages (d. sizes.The difference in the brightness of two stars with the same surface temperature is attributable to their SIZES.Expert answered| jeifunk |Points 23677|.ensities (b. colors (c. ages (d. sizes. The difference in the brightness of two stars with the same surface temperature is attributable to their SIZES.
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- The luminosity of supergiant stars is determined by the core mass, and not the total mass as it is in main sequence (MS) stars. At the end of their helium-core burning stage, these stars left the giant branch (where
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- $82,000. Average Physician Assistant salaries for job postings in Boston, MA are 26% higher than average Physician Assistant salaries for job postings nationwide.82,000. Average Physician Assistant salaries for job postings in Boston, MA are 26% higher than average Physician Assistant salaries for job postings nationwide.
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What determines the color of a star other than temperature? What determines the color of a star? Which factors are responsible for the colored appearance of stars? The main factor responsible for color of stars is the surface temperature of Star. The other factors responsible for color of stars are following: Human Vision; Interstellar Reddening and Extinction; Metallicity in the star
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Stars A star's brightness is known as its magnitude. Astronomers rate the magnitude of a star with a scale that gives brighter stars a low number and dim stars a higher number. Each whole number on this scale is 2.5 times dimmer than the previous number. The brightest star the night sky is Sirius. With a magnitude of -1.46, it is almost 15 times brighter than a star with a magnitude of zero. Stars with a magnitude of 8 or more are too dim to see with the naked eye. Stars are identified by their color, which indicates their temperature.