0
Sirius has less absolute magnitude than Rigel. Sirius is smaller and less luminous than Rigel, but much closer to us, so Sirius appears brighter. Sirius, in fact, is the brightest star in our sky (with the exception of our own star, the sun.) Rigel is still pretty bright, but many times farther away from us than Sirius.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoThe absolute magnitude of the stars are:
- Rigel -6.7
- Sirius +1.4
Rigel has a negative absolute magnitude, so it is brighter than Sirius.
Add your answer:
Earn +20 pts
Explain why size is the only factor that determines the stars absolute magnitude?
The absolute magnitude is a measure of the star's luminosity hence the smaller the size the less the absolute magnitude.
What constellation has 2 of the brightest stars in the sky?
Generally, stars are named with a Greek letter designating the relative brightness followed by the name of the constellation. "Alpha" and "Beta" are (generally) the two brightest stars. So the brightest star in the constellation Scorpio is "Alpha Scorpius". Most bright stars also have Arabic names; Alpha Scorpius is better known as Antares. This pattern doesn't ALWAYS hold; for example, the red giant star Betelgeuse is Alpha Orionis, while Rigel is Beta Orionis. But Rigel is brighter than Betelgeuse! The answer is that Betelgeuse is a somewhat-variable star, and when the stars were formally catalogued, was brighter than Rigel. Betelgeuse has since dimmed a little, and is now less bright that Rigel. Some astronomers use Betelgeuse's variability as a sign that it is nearing the end of its life, and will "soon" explode as a supernova. Of course, "soon" to an astronomer means "within the next 10,000 years or so".
How can two stars have the same absolute magnitude but be differents sizes?
The idea is that a larger star may be cooler - emit less energy per square meter of surface. The total energy emitted is equal to the surface area, multiplied by the energy emitted per unit area.
How do size temperature and distance affect a star's magnitude or luminousity?
A star's real luminosity is proportional to the the square of its diameter, and more or less proportional to the fourth power of its absolute temperature. The star's apparent luminosity is proportional to its real luminosity. It is also inversely proportional to the square of the distance.
How does the sun compare to other stars in term of surface temperature apparent magnitude absolute magnitude and size?
The Sun is approximately at the percentile 85 or 90, with respect to most size-related criteria (size, brightness). That means that about 85-90% of stars are smaller and less bright than our Sun. The exact number is hard to establish, since it has turned out difficult to have good estimates about the number of red dwarves.
Explain why size is the only factor that determines the stars absolute magnitude?
The absolute magnitude is a measure of the star's luminosity hence the smaller the size the less the absolute magnitude.
What magnitude is not possible when a vector of a magnitude of 3 is added to a vector of a magnitude of 4?
A magnitude of less than 1. cw: An absolute magnitude of less than 1.
Which stars always have large positive absolute magnitude?
Does it mean that the star is a main sequesnce star? ( . Y . ) The above isn't true. A star can be a blue supergiant and be on the main sequence but still not be even visible to us, therefore the apparent and absolute magnitude wouldn't be the same. But to answer your question, I don't think it has a name, it just means that you are seeing the star's absolute and apparent magnitude at the same time, so if you placed the star at 32.6 light years away(the absolute magnitude scale)then the star would not appear to change in brightness
Why is the absolute magnitude of some stars greatar than their apparent magnitude?
The question is: Why is the apparent magnitude of some stars less than their absolute magnitude. Or: Why do some stars not look as bright as they really are ? The answer is: Because they're so far away from us.
How does the sun compare to other stars in terms of surface temperature apparent absolute magnatuide and size?
Temperatures in the sun's middle atmosphere, the Chromosphere are 4,225°C to 6,000°C. In the sun's outer atmosphere, or Corona, temperatures may reach 2,000,000°C, while stars are related to colour: Stars that have the lowest surface temperatures (below 3,500 °C)are red. Stars that have the highest surface temperatures (above 25,000 °C) are blue. The Apparent Magnitude of the sun is less than the other stars. Some stars are actually more luminous, or brighter than the sun is. If these stars are located far from Earth, they may not appear bright to us. Using only their eyes, ancient astronomers described star brightness by magnitude. They called the brightest stars they could see 'first magnitude' and the faintest stars they could see 'sixth magnitude'. Astronomers using telescopes see many stars that are too dim to see through the naked eye. Rather than replacing the magnitude system, astronomers added to it. Today, the brightest stars have a magnitude of about -2. The faintest stars that we can see through a telescope have a magnitude of +30. Sirius the brightest star in the night sky has an apparent magnitude of -1.46. To the naked eye, the sun has apparent magnitude of -26.8, even though it is not as luminous a star as Sirius is. The sun is simply located closer to Earth. The apparent magnitude of the sun is -26.8. However the absolute magnitude of the sun is +4.8 which is typical of many stars. Now compare the sun, which is located 8.3 light minutes from Earth, to Sirius, which is located 8.6 light years from Earth. Sirius has an apparent magnitude of -1.46 and an absolute magnitude of +1.4. Therefore, Sirius is much more luminous than the sun is.
Can the product of two numbers be less than either of the numbers?
If one of the numbers is negative, but the other is positive, then the product is negative - and therefore smaller than both numbers in the question. For example, 2 x -4 = -8. ===================================== Another contributor added: Also, whenever the absolute magnitude of both factors is less than ' 1 ', the absolute magnitude of the product is less than either factor.
Why does Arcturus star have greater absolute magnitude than the sun buy a much lower apparent magnitude?
The apparent magnitude is how bright the star appears to us, but stars are all at different distances so that a star that is really bright might look dim because it is very far away. So the absolute magnitude measures how bright the star would look if it was placed at a standard distance of 10 parsecs. When the absolute magnitude is greater than the apparent magnitude, it just means that it is closer than 10 pc. The brightest stars have absolute magnitudes around -7.
What is triangular inequality of complex number?
The absolute value of the sum of two complex numbers is less than or equal to the sum of their absolute values.
What is greater -4.28 and -4.13?
-0.15000000000000036
The color age and temperature of a star is deternmined mostly by the?
Sirius is the brightest star in the night sky with a visual apparent magnitude of -1.47, almost twice as bright as the next brightest star Canopus. It is also known colloquially as the "Dog Star", reflecting its prominence in its constellation, Canis Major (English: Big Dog). It is the subject of more mythological and folkloric tales than any other star apart from the sun. The heliacal rising of Sirius marked the flooding of the Nile in Ancient Egypt and the 'Dog Days' of summer by the Ancient Greeks, while to the Polynesians it marked winter and was an important star for navigation around the Pacific Ocean. What appears as a single star to the naked eye is actually a binary star system, consisting of a white main sequence star of spectral type A1V, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The reason for its brightness is not its intrinsic luminosity but its closeness to the Sun; at a distance of 2.6 PC or 8.6 light years, Sirius (more correctly the Sirius system) is one of our near neighbours. Sirius A is only about twice as massive as the Sun and, with an absolute magnitude of 1.42, has far less intrinsic luminosity than other bright stars such as Canopus or Rigel. The Sirius Star System is between 200 and 300 million years old and comprised of two bright bluish stars early in its existence. The more luminous star, Sirius B, consumed its resources and became a red giant before shedding its outer layers and collapsing into its current state as a white dwarf around 120 million years ago.
Is -12 smaller than -2?
-10
Is it possible for two regular stars to have the same absolute magnitude but different apparent magnitudes?
Yes, if the matter surrounding one star is more dense than that surrounding the other it would appear to be less bright.
