What is a white dwarf one that has high mass star or the low mass star?

Answer 1

== == The temperature of white dwarfs and neutron stars depend on a variety of factors, such as their age and mass. But the short answer is that neutron stars are hotter. Read on for more specific info.

Observed white dwarfs' temperatures have ranged between 150,000 K and 3,900 K. Since white dwarfs generate heat through stored energy, rather than fusion, their temperature decreases over time, theoretically cooling until they become non-radiating black dwarfs. However, since white dwarfs do not have any fusion forces preventing gravity from collapsing their mass, they have a relatively small surface from which to radiate their stored heat so it takes a long time for them to cool. Because of this and the fact that the universe's age is finite, it is thought that no black dwarfs yet exist. At the moment of a neutron star's birth following a type II supernova its temperature will be roughly 10^12 K, but through neutrino emissions, it will cool very quickly. Within seconds its temperature will drop below 10^11 K. At a certain point, predicting the cooling rate of a neutron star is impossible, since we don't have enough data and we aren't sure exactly what makes up the core of a neutron star. Using X-Ray emission detectors, we've been able to estimate the Crab Pulsar's temperature at 2-3 million K. This pulsar is about 1000 years old.

As a point of comparison, the sun's surface temperature is 5,800 K.

For both white dwarfs and neutron stars, accretion of matter will heat them up. Interestingly, they also get smaller because of the additional gravitational force. A white dwarf that is within a binary solar system-- such as HR 8210-- may accrete matter from its companion star, shrinking in size until its hits a critical mass and erupts into a type I supernova, most likely destroying the white dwarf (there's an outside chance that the supernova would leave a neutron star behind, but it's unlikely). Similarly, a neutron star may also accrete matter from a companion star, but rather than triggering a supernova, the added mass will collapse the neutron star until it becomes a black hole.

Answer 2

Yes. The white dwarf star is a star with a mass comparable to the sun and a volume similar to that of the earth. It's very dense. But a neutron star has collapsed from its precursor form, and it's only a few dozen kilometers in diameter but still has a mass of one or two times that of the sun. That makes the white dwarf larger, but less dense than the neutron star.

Answer 3

The largest white dwarf we know of is in the planetary nebula NGC 6853, and it's the central star. Nestled in the constellation Vulpecula, it is some 1,300 to 1,400 light years from our local star.

Answer 4

A white dwarf star can be as hot as 150,000 degrees kelvin.

Answer 5

A white dwarf star is a star somewhere near the mass of our Sun that has reached extreme old age.

Answer 6

Color in terms of stars in almost opposite what you would think. White stars of spectral class B or A are hotter than yellow stars of spectral class F or G.

Answer 7

A white dwarf is oldest because it is the final stage in the evolution of most

stars, more or less.

Answer 8

alpha centauri

Answer 9

A nova is much brighter than the others.

Answer 10

blue giant