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Sirius is not a single star but a binary star system consisting of a white main sequence star and a white dwarf.
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How are Sirius and betelgeuse unlike?
Sirius is a white main sequence star, whereas Betelgeuse is a red supergiant not on the main sequence.
Which main sequence stars are most massive?
Most stars in the universe today are main sequence stars. Sirius A is the brightest star in the nighttime sky. The sun is the most massive main sequence star in the universe today.
Name an example of a main sequence?
The sun is a main sequence star
What does it mean when a star goes off the main sequence?
When a star "goes off the main-sequence" it generally means the star has run out of hydrogen fuel and is beginning the post-main-sequence or its end of life phase. The main sequence of a star is the time where it is no longer just a proto-star but is burning hydrogen as a primary source of fuel.
Is a white dwarf considered a main sequence star?
No, a white dwarf is not considered a main sequence star. A main sequence star is a star that is still fusing hydrogen in its core. A white dwarf is the remnant of a low to medium mass star in which fusion has stopped.
How are Sirius and betelgeuse unlike?
Sirius is a white main sequence star, whereas Betelgeuse is a red supergiant not on the main sequence.
Is sirius a blue super giant?
No. Sirius is a two-star system consisting of a white main sequence star and a white dwarf.
Is Sirius A a main sequence star?
Polaris - the current North star is a multiple star system., consisting of the main star and smaller companions. The main star Alpha Ursae Minoris is a bright star, a 6 solar mass supergiant and it is a main sequence star. Orbiting very close to this main star is a white dwarf of roughly 1.5 solar masses. This is not a main sequence star. Orbiting further out is the third companion, a 1.39 solar mass star. This is a main sequence star. There are also two more distant components (α UMi C and α UMi D) - Polaris is thought to be part of an open cluster - I do not know if these later two stars are main sequence or not.
Is Sirius a medium mass star?
Yes, Sirius is about twice as massive as our sun, making it a medium mass star. It is quite a bit brighter, however, and is the second brightest star in our sky.
Which main sequence stars are most massive?
Most stars in the universe today are main sequence stars. Sirius A is the brightest star in the nighttime sky. The sun is the most massive main sequence star in the universe today.
How do you get the scale?
If Our Star Were the size of a Basketball, Sirius A (Main Sequence) Would be a size of A Teddy Bear.
How do you do scale?
If Our Star Were the size of a Basketball, Sirius A (Main Sequence) Would be a size of A Teddy Bear.
How far apart are Sirius A and Sirius B?
Sirius is a binary star system Sirius A and Sirius B.The distance separating Sirius A from B varies between 8.1 and 31.5 AU. (See related question).
What stage is Sirius a in?
main sequence
What is the surface temp and color of the siruis?
Sirius has a surface temperature of approx 9940 K, and is a white main sequence star.
What current stage of stellar evolution is Sirius?
Sirius consists of two stars.Sirius A is a main-sequence star with about two solar masses.Sirius B is a white dwarf with about one solar mass. During its main-sequence, it's estimated to have been around five solar masses.
Is Sirius a cold star?
No. Sirius is far from a cold star. Sirius is actually a binary system about 8.6 light years away. Sirius A is a white main sequence star just over twice the size of the sun. Sirius B is a white dwarf stellar remnant of about 0.978 solar masses. The temperature of the two stars are far higher than that of our sun. The sun is about 5778 Kelvin, Sirius A is almost twice that at 9,940 K and Sirius B is many times that at 25,200 K.
