What is the temperature and luminosity of the sun?
Ori. We define the subscripted symbol to mean that of the Sun. Thus the Sun has a luminosity of 1 L (1 L = 3.9 × 10 ergs per second), and a temperature of 1 T (1 T = 5,800 K).
Which star has a higher luminosity and a lower surface temperature than the sun?
VY Canis Majoris
What does a star’s temperature tell us about its luminosity?
The Luminosity of a star depends on BOTH its temperature and its radius (surface area): L is proportional to R2 T4. A hotter star is more luminous than a cooler one of the same radius. A bigger star is more luminous than a smaller one of the same temperature.
What are the spectral type temperature and luminosity of star A?
Harvard spectral classification
|Class||Effective temperature||Main-sequence luminosity (bolometric)|
|B||10,000–30,000 K||25–30,000 L ☉|
|A||7,500–10,000 K||5–25 L ☉|
|F||6,000–7,500 K||1.5–5 L ☉|
|G||5,200–6,000 K||0.6–1.5 L ☉|
Which star has the highest surface temperature?
Type O stars
What is the final state of the most massive stars?
A massive star terminates in a brilliant explosion called a supernova. The two possible products of a supernova event are a neutron star or a black hole.
What counts as a massive star?
Any star which is larger than eight solar masses during its regular main sequence lifetime is considered a massive star. Massive stars are born, just like average stars, out of clouds of dust called nebulae. When a nebula collects enough mass, it begins to collapse under its own gravity.
Can I buy a star?
Can you Buy a Star? No, star names can not be “sold.” Only the International Astronomical Union officially names stars. Some stars have names passed down through the ages. Most stars named by the IAU simply have numbers and coordinates.
Can a star die?
Most stars take millions of years to die. When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. After puffing off its outer layers, the star collapses to form a very dense white dwarf.
What happens after a star dies?
When the helium fuel runs out, the core will expand and cool. The upper layers will expand and eject material that will collect around the dying star to form a planetary nebula. Finally, the core will cool into a white dwarf and then eventually into a black dwarf. This entire process will take a few billion years.
Why do stars explode when they die?
Stars die because they exhaust their nuclear fuel. Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.