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The radius of Betelgeuse varies by about 60 percent within a period of 3 years If the stars surface temperature remains the same what is the ratio of the two absolute magnitudes?
If the radius of Betelgeuse varies by 60% within three years, its luminosity will also change proportionally. Since absolute magnitude is related to luminosity, the ratio of the two absolute magnitudes will be the square root of the ratio of the luminosities. So, the ratio of the two absolute magnitudes will be approximately 1.22.
What types of numbers are used to represent the magnitudes of very bright stars?
The magnitudes of very bright stars are represented using the apparent magnitude scale, which is a logarithmic scale. In this system, lower numerical values indicate brighter stars, with some of the brightest stars having negative magnitudes. For example, a star with a magnitude of -1 is brighter than one with a magnitude of +1. This scale allows astronomers to compare the brightness of celestial objects effectively.
How do you find the brightness ratio of stars?
The brightness ratio of stars is typically expressed using a magnitude scale. The magnitude scale is a logarithmic scale that measures the brightness of celestial objects, including stars. The lower the magnitude value, the brighter the object. Conversely, higher magnitude values indicate fainter objects. The magnitude scale is defined such that a difference of 5 magnitudes corresponds to a brightness ratio of exactly 100. In other words, a star that is 5 magnitudes brighter than another star is 100 times brighter. Similarly, a star that is 10 magnitudes brighter is 100 x 100 = 10,000 times brighter, and so on. To find the brightness ratio (R) between two stars with different magnitude values (m1 and m2), you can use the following formula: R = 100^( (m2 - m1) / 5 ) Where: R = Brightness ratio between the two stars. m1 = Magnitude of the first star. m2 = Magnitude of the second star. For example, if Star A has a magnitude of 2 and Star B has a magnitude of 6, you can calculate the brightness ratio as follows: R = 100^( (6 - 2) / 5 ) R = 100^(4/5) R ≈ 2.511 So, Star B is approximately 2.511 times dimmer than Star A. It's important to note that the magnitude scale is relative, and negative magnitudes indicate exceptionally bright objects (e.g., the Sun, which has an apparent magnitude of approximately -26.74), while positive magnitudes represent progressively fainter objects. Additionally, the magnitude of a star can be influenced by various factors, such as distance, intrinsic brightness, and interstellar dust extinction.
Who are the astronomer divided the stars into six magnitudes of brightness?
The astronomer who divided stars into six magnitudes of brightness was Hipparchus, a Greek astronomer active in the 2nd century BCE. He developed a system to categorize stars based on their apparent brightness, with the first magnitude representing the brightest stars and the sixth magnitude representing the faintest stars visible to the naked eye. This magnitude scale laid the groundwork for modern astronomical classification of stellar brightness.
What is a H-R diagram and what two characteristics of stars are compared on it?
It is a diagram on which stars are plotted according to their absolute magnitudes (or luminosities) against their stellar classifications (or effective temperatures).
Two stars whose apparent magnitudes differ from each other by five magnitudes have a ratio of brightness of?
About 97.7 (calculated as 2.55)
What are the brightness of stars?
magnitude, dim stars have positive magnitudes and bright stars have negative magnitudes
The radius of Betelgeuse varies by about 60 percent within a period of 3 years If the stars surface temperature remains the same what is the ratio of the two absolute magnitudes?
If the radius of Betelgeuse varies by 60% within three years, its luminosity will also change proportionally. Since absolute magnitude is related to luminosity, the ratio of the two absolute magnitudes will be the square root of the ratio of the luminosities. So, the ratio of the two absolute magnitudes will be approximately 1.22.
If light from one star is 40 times more intense than light from another star what is their difference in magnitudes?
The difference in magnitudes between two stars with a ratio of 40 in intensity is 5 magnitudes. This is because every 5 magnitude difference corresponds to a factor of 100 in brightness (2.512^5 ≈ 100) as per the magnitude scale formula: m2 - m1 = -2.5 * log(I2/I1).
What the magnitudeof the little dipper?
Asterisms don't have magnitudes. Stars have individual magnitudes.
Have absolute magnitudes of ones or less?
dwarf stars -Sydney-
What are the different magnitudes if stars in Draco?
See related link
What is the ratio of apparent brightnesses for two stars if m A equals 7 and m B equals 5?
(7 - 5) = 2 magnitudesEach magnitude represents the ratio = 6th root of 100.2 magnitudes = (6th root of 100)2 = (cube root of 100) = ratio of 4.642 (rounded)
What indicates a stars temperature and brightness?
A star's temperature is indicated by its color, with hotter stars appearing blue and cooler stars appearing red. Brightness is measured using the star's apparent magnitude, with higher magnitudes representing dimmer stars and lower magnitudes representing brighter stars.
Are stars ranked by their light intensity?
Yes, stars are often ranked by their light intensity using a scale known as magnitude. The apparent magnitude measures how bright a star appears from Earth, while absolute magnitude indicates the intrinsic brightness of a star at a standard distance. The scale is logarithmic, meaning that a difference of 5 magnitudes corresponds to a brightness factor of 100. Thus, lower magnitude numbers indicate brighter stars.
How would you compare the brightness of Polaris with that of other stars in the sky?
Stars' brightness is measured by their magnitudes. There are first-magnitude stars which are the bright ones, down to 6th magnitude which is the faintest that can be seen with perfect eyesight on perfectly clear nights. Within that you can have stars with fractional magnitudes, for example magnitude 3.5 is half a magnitude fainter than magnitude 3. There are also negative magnitudes for the few brightest stars that are brighter than magnitude 0. The scale is logarithmic, with a difference of 5 magnitudes equal to a difference of 100 in brightness. Each magnitude is a ratio of 100^(1/5) which is equal to 2.512. Polaris has a magnitude of 2.02 and is less than a degree from being exactly in line with the Earth's north and south poles, which means when you look at it you are always facing north, to better than 1 degree.
The brightest stars have apparent magnitudes that are?
The brightest stars have apparent magnitudes that are lower, indicating they appear brighter in the sky. The apparent magnitude scale is inverted, with lower values representing brighter objects and higher values representing dimmer objects. Bright stars typically have apparent magnitudes between -1 to 1.
