If the distance between us and a star is doubled with everything else remaining the same the luminosity?

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remains the same, but the apparent brightness is decreased by a factor of four
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What is the luminosity of the star regulus?

In astronomy, Luminosity is the amount of energy a body radiates per unit time.. The luminosity of stars is measured in two forms: apparent (counting visible light only) and bolometric (total radiant energy); a bolometer is an instrument that measures radiant energy over a wide band by absorption a ( Full Answer )

How are the distances between stars measured?

A thorough answer would take a long time. I'll try to give a simplified answer. There's more than one way these distances are measured or estimated. The distance to most stars is estimated, not measured. As stars are further away, distance is measured using different methods. This use of diffe ( Full Answer )

Average distance between stars?

What is the length of a piece of string? No-one can know for sure, because there are assumed to be a ridiculously big number of stars in the universe. Proxima Centauri, our nearest star other than the sun, is 4.2 LY away. Sirius A and B are 8.6 LY away You could also look at the related q ( Full Answer )

What is The unit used to measure the distance between stars?

Laypeople tend to use light years. Astronomers generally use parsecs, which has the advantage of sounding (slightly) less like a time unit than "light years" does (though not a lot less; Han Solo in Star Wars IV claims the Millennium Falcon is "the ship that made the Kessel run in less than 12 pars ( Full Answer )

Which star has the greatest luminosity?

Current contenders are:- LBV 1806-20, The Pistol Star and Cygnus OB2-12. All are over 6 million times more luminous than our own Sun.

What is the difference between a stars brightness and its luminosity?

The difference between apparent brightness andluminosity is that apparent brightness means that a star may appearto be bright, but only looks bright because of the relativelycloseness a star is to earth. Luminosity is used by astronomers andrefers to the power output of a star. Apparent Brightness ( Full Answer )

Is the luminosity of stars affected by temperature?

The stellar classification [See link] in order of temperature. Luminosity (L) is based on our Sun. Our Sun is classed as yellow and has a luminosity of 1. . Blue > 30,000 Kelvin. > 30,000 L . Blue to blue white 10,000 -> 30,000 Kelvin. 25 -> 30,000 L . White 7,500 -> 10,000 Kelvin. 5 -> 25 L ( Full Answer )

How is a stars luminosity measured?

A star's luminosity is measured according to the relevance to the sun. Basically for example, if a star is 8,300 degrees Celsius and has a luminosity of 0.001; the luminosity is compared to the sun.

What does size tell us about the luminosity of stars?

Generally, the larger the star, the more luminous it is. However, luminosity is measured as the visible light of a star as seen at the interstellar distance of 10 parsecs. So a massive star could have a lower luminosity than a bright blue supergiant.

What do astronomers use to measure distances between stars?

If you refer to the units, both the light-year and the parsec are often used. A light-year is the distance light travels in a year; about 9.5 x 10 12 kilometers (9.5 million million kilometers). A parsec is about 3.26 light-years.

How two stars with unequal luminosity may appear to have the same brightness to an observer?

Two different stars with different luminosity may appear to havethe same brightness to an observer because the brighter may be moredistant. This illustrates the need in astronomy to help range distant stars;since apparent magnitude alone will not yield enough information togauge distance. The establ ( Full Answer )

What is the luminosity of red dwarf stars?

Generally, the luminosity of red dwarfs are very low. The largest red dwarf known (Lacaille 8760) has a luminosity 10% of our own Sun, whereas the coolest has a luminosity 1/10,000 th that of our Sun.

Relationship between stars distance to earth and luminosity?

Generally speaking, the apparent luminosity would be an inversesquare relationship, which is to say, if the same star was at twicethe distance, a quarter of the light would be reaching theobserver. But absolute luminosity can of course vary without regardto distance from Earth - dim stars can be clo ( Full Answer )

Which distance measurement is most useful in measuring the distance between stars?

There are two in common use; the "light year", which is the distance that light travels in one year, and the "parsec". The parsec is a "parallax-second of arc", the distance that an object would be from Earth if it appears to be separated by one second of arc as viewed from one side of the Earth's o ( Full Answer )

What is the distance between stars and glaxies?

Typical distances between nearby stars are in the order of a fewlight-years; for example, the closest star to Earth (after our Sun)is at a distance of about 4.2 light-years. Typical distances between nearby galaxies are in the order of ahundred-thousand light-years, to several million light-years. F ( Full Answer )

How do astronomers determine a stars luminosity?

There are many methods, but the most common one today, for individual stars, is to use the Hertzprung-Russell (H-R) diagram. This diagram is a graph of many stars with luminosity on the y-axis, and temperature on the x-axis. Astronomers have discovered that this graph, coupled with some analysis ( Full Answer )

How do you use Cephids to determine the distances between earth and stars?

These are "variable stars" because their brightness goes up and down with regularity. It was discovered that the frequency depends on the average brightness. So if you see a very dim star behaving as a Cepheid then you can tell how bright it is basically, and then its dimness tells you how far away ( Full Answer )

Distance between stars?

In the case of a double star, the distance between two stars can be a fraction of an astronomical unit - i.e., a few light-minutes. Otherwise, the distance between the nearest stars in our neighborhood is typically a few light-years, but in some places - near the galactic center, or in globular clus ( Full Answer )

What factor affects the luminosity of stars?

There are 2 main factors: the size of the star and its surface temperature. A larger size means a larger surface area to emit light. A higher surface temperature increases the energy emitted. Seen from Earth, the brightness of a star depends on how far away the star is as well as its actual ( Full Answer )

What is the luminosity of Barnard's Star?

Barnards star is a highly variable star and can have different brightnesses. . Apparent magnitude - 9.54 . Absolute magnitude - 13.22 See related question about the difference between absolute and apparent magnitude

How is the luminosity of a star related to its temperature?

At a higher temperature, the star will shine more brightly for each square meter of surface. The total luminosity per square meter is approximately proportional to the fourth power of its absolute temperature. This refers to the energy output, considering all types of electromagnetic waves, not just ( Full Answer )

Why are light years used to measure the distance between star?

A light year is a very long distance, the distance travelled in one year at the speed of light. Astronomical distances are very large though, so light years are used to build a greater appreciation of the distances involved. Km or Miles could be used, but the numbers would be too large to comprehend ( Full Answer )

What is giant stars luminosity?

The luminosity for any star is given by the luminosity equation: L=4*pi*sigma*R 2 *(Teff) 4 where sigma is the Stefan-Boltzmann constant (approx. 5.6704x10 -8 W m -2 K -4 ), R is the radius of the star, and Teff is the effective temperature of the star (aka the temperature we observe). ( Full Answer )

Why does the distance between two consecutive latitude remain the same?

Visualize this: Cut the earth in half, and look into one half as if you are looking at a circular target. At the center is the center of the earth. Imagine a line from the center straight up to 12 o'clock and another line from center to 3 o'clock, forming a right angle. At three o'clock you have zer ( Full Answer )

What type of measure do you use to measure the distance between stars?

There are two principal measurements: the light year and the parsec. The light year, about 9.46 trillion km, is the distance light, at 299,000 kps, travels in a tropical year. The other, which is about 3-and-a-quarter light years, is a figure derived by using the difference in position between two p ( Full Answer )

Are all the stars in constellation the same distance away fromm us?

Any constellation is a group of stars that appear to form some kindof pattern, but have no connection with each other. They all happen to be inroughly the same direction from us, but they're all at different distances. Sothere's no such thing as a constellation's distance from us.

What is the luminosity of a medium size star?

A good example of a medium size star is the Sun, which is veryaverage. Luminosity is measured by the star's absolute magnitude,which is the magnitude seen from a standard distance of ten parsecs(32.6 light-years), and the Sun's absolute magnitude is +4.7. Afactor of 100 increase in luminosity corres ( Full Answer )

How can stars remain in the same position in the sky?

Stars all appear to revolve around the sky each day as the Earthrevolves, but relative to each other the stars stay 'fixed'. Thatis because they are so distant it takes years for any of them tomove appreciably.